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Home / DTC / P1516 — Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

P1516 — Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Detailed page for trouble code P1516.

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P1516

BUICK P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: BUICK
Type: P — Powertrain
Views: UK: 21 EN: 51 RU: 33
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Code

P1516

CADILLAC P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CADILLAC
Type: P — Powertrain
Views: UK: 24 EN: 55 RU: 37
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

CHEVROLET P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CHEVROLET
Type: P — Powertrain
Views: UK: 24 EN: 50 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

CHRYSLER P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: CHRYSLER
Type: P — Powertrain
Views: UK: 25 EN: 52 RU: 35
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

FORD P — Powertrain

Intake Manifold Runner Control Input Error

Brand: FORD
Type: P — Powertrain
Views: UK: 22 EN: 51 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

Generic P — Powertrain

IMRC Input Error (Bank 1)

Brand: Generic
Type: P — Powertrain
Views: UK: 22 EN: 52 RU: 37
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Short description

Official workshop manual for the Audi A3 2.0L FSI turbo engine (mechanics). Includes step‑by‑step removal/install procedures, technical data, tightening torques and diagnostic/repair instructions. Intended for professional garages and experienced technicians.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (code letters AXX, BPY, BWA, BHZ, BZC, CDL — capacity, power, torque, bore/stroke, compression, ignition)
  • 3 Safety precautions
  • 3.1 Working on the fuel system
  • 3.2 Procedure before opening high-pressure section
  • 3.3 Working on the cooling system
  • 3.4 Using testers during road test
  • 3.5 Working on the exhaust system
  • 4 General repair instructions
  • 4.1 Cleanliness rules for fuel/injection/turbo
  • 4.2 Checking fuel system for leaks
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Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)

Workshop Manual
Years: 2004 Manual in English Pages: 150 68.2 MB
Short description

Workshop manual for the Audi A3 (2004) — Electrical system. Includes procedures for battery, starter, alternator, gauges, wipers, exterior/interior lighting and wiring. Edition 02.2018.

199,00 UAH
Contents
Key sections:
  • List of Workshop Manual Repair Groups
  • - 27 Starter, current supply, CCS
  • - 90 Gauges, instruments
  • - 92 Windscreen wash/wipe system
  • - 94 Lights, bulbs, switches - exterior
  • - 96 Lights, bulbs, switches - interior
  • - 97 Wiring
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007

Workshop Manual
Years: 2001–2003 Manual in English Pages: 307 7.3 MB
Short description

Comprehensive workshop manual for Audi A4 (2001) and A4 Cabriolet (2003) with the 4.2 L V8, 5‑valve engine with timing chains (Engine IDs BBK/BHF). Includes step‑by‑step procedures for engine removal/installation, crankshaft and timing chain service, cylinder head/valve gear, lubrication, cooling and exhaust system repairs. Intended for professional technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (Codes: BBK / BHF; 4.163 l; 253 kW @7000 rpm; torque 410–420 Nm; bore 84.5 mm; stroke 92.8 mm; compression ratio 11.5; RON 98)
  • 3 Safety precautions
  • 4 General repair instructions (cleanliness, fuel system, contact corrosion)
  • 10 - Removing and installing engine
  • 1 Removing engine - vehicles with manual gearbox
  • 1.1 Removing engine (tools, drain fluids, remove bumper, lock carrier, disconnect wiring, fuel, coolant, A/C lines, suspension components, propshaft, exhaust, support engine on platform, lower assembly)
  • 1.2 Separating engine and gearbox (subframe removal, support sets, remove front exhaust pipes, bolt sequence)
  • 1.3 Securing engine to engine and gearbox stand (lifting tackle, VAS 6095 support)
  • 1.4 Installing engine (clutch remarks, alignment, torque values)
  • 2 Removing and installing engine - vehicles with automatic gearbox (procedure parallels manual gearbox with ATF/torque converter notes)
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Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)

Workshop Manual
Years: 2001 Manual in English Pages: 259 2.0 MB
Short description

Workshop Manual for Audi A4 and A4 Cabriolet — Auxiliary Heater (Edition 08.2004). Contains self-diagnosis procedures, fault tables, electrical and fuel system checks, final control tests, CO₂ exhaust adjustment and step-by-step removal/installation and repair procedures. Intended for professional workshop use.

199,00 UAH
Contents
Key sections:
  • 01 - Self-diagnosis, electrical checks
  • 1 Auxiliary heater self-diagnosis
  • 1.1 Technical data of self-diagnosis
  • 1.2 Function
  • 1.3 Fault recognition
  • 1.4 Guided fault-finding
  • 1.5 Technical data of self-diagnosis
  • 1.6 Test requirements for self-diagnosis
  • 1.7 Safety precautions
  • 2 Self-diagnosis procedure
  • 2.1 Connecting vehicle diagnostic VAS 5051A/K-wire adapter
  • 2.1.1 Control unit identification
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Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)

Workshop Manual
Years: 2001 Manual in English Pages: 34 851.0 KB
Short description

Service manual for Audi A4 (2001‑) and A4 Cabriolet (2003‑) with 1.8L 4‑cylinder turbo engines. Covers Motronic fuel injection and ignition systems, diagnostic and maintenance procedures. Includes technical data, removal/installation steps and system checks.

199,00 UAH
Contents
Key sections:
  • 24 - Mixture preparation - injection
  • 1 Safety precautions and rules for cleanliness
  • 1.1 General notes on self-diagnosis
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Rules for cleanliness and instructions for working on fuel system
  • 1.4 Checking vacuum system
  • 2 Injection system
  • 2.1 Technical data
  • 2.2 Overview of fitting locations - injection system
  • 3 Intake manifold
  • 3.1 Exploded view - intake manifold
  • 3.2 Removing and installing intake manifold
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)

Workshop Manual
Years: 2003 Manual in English Pages: 369 9.1 MB
Short description

Comprehensive workshop manual for the Audi A8 (2003) electrical system — Edition 08.2014. Covers battery, alternator, starter, instrument cluster, wiper/washer systems, exterior/interior lighting and wiring repair procedures with step-by-step illustrations. Includes diagnostic and adjustment procedures and torque/data specifications.

199,00 UAH
Contents
Key sections:
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
  • 2.3 Disconnecting and connecting battery
  • 2.4 Removing and installing battery
  • - Remove luggage compartment side trim (right-side)
  • - Connect battery charger for back-up power
  • - Detach earth and positive cables, central venting hose
  • - Remove battery retainer plate and lift battery out
  • - Installation notes, adaptation via Vehicle diagnostic tester
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685

Workshop Manual
Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

199,00 UAH
Contents
Key sections:
  • Introduction
  • - Introduction to Audi Q4 e-tron
  • - Dimensions
  • Body
  • - Body structure and materials
  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

199,00 UAH
Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Buy
Your experience will help others
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Code

P1516

GM P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: GM
Type: P — Powertrain
Views: UK: 27 EN: 55 RU: 39
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

GMC P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: GMC
Type: P — Powertrain
Views: UK: 28 EN: 73 RU: 42
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

HUMMER P — Powertrain

Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Brand: HUMMER
Type: P — Powertrain
Views: UK: 11 EN: 35 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

JAGUAR P — Powertrain

Gear Change Neutral Drive Fault

Brand: JAGUAR
Type: P — Powertrain
Views: UK: 24 EN: 60 RU: 38
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Code

P1516

LAND ROVER P — Powertrain

Failure in the activation in park / neutral

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 8 EN: 26 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1

LAND ROVER 2015 Discovery Sport HSE

HTML Manual
Discovery Sport HSE Years: 2015 Manual in English Sections: 61,541 AI chunks: 61,541
Short description
LAND ROVER · Discovery Sport HSE · 2015
Open manual
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Buy

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Buy

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Buy
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Code

P1516

LINCOLN P — Powertrain

Intake Manifold Runner Control Input Error

Brand: LINCOLN
Type: P — Powertrain
Views: UK: 23 EN: 50 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Code

P1516

MAZDA P — Powertrain

Gear Change Neutral Drive Fault

Brand: MAZDA
Type: P — Powertrain
Views: UK: 24 EN: 52 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

MERCURY P — Powertrain

Intake Manifold Runner Control Input Error

Brand: MERCURY
Type: P — Powertrain
Views: UK: 28 EN: 72 RU: 46
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Code

P1516

OLDSMOBILE P — Powertrain

Throttle Actuator Control TAC Module Throttle Actuator Position Performance

Brand: OLDSMOBILE
Type: P — Powertrain
Views: UK: 23 EN: 52 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

Other P — Powertrain

IMRC Input Error (Bank 1)

Brand: Other
Type: P — Powertrain
Views: UK: 23 EN: 51 RU: 35
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Workshop Manuals

Available brands with manuals

2
AUDI 11

6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)

Workshop Manual
Years: 2008 Manual in English Pages: 187 4.9 MB
Short description

Workshop manual for the 6‑speed manual gearbox 0B1 (front‑wheel drive). Includes identification, technical data, gearbox/selector removal & installation procedures, clutch hydraulics, adjustment instructions and front differential service. Applicable to Audi A4, Audi A5 (Coupé, Cabriolet, Sportback) and Audi Q5 as referenced in the manual. Edition: 05.2014.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Identification
  • 1.1 Gearbox identification
  • 2 Technical data
  • 2.1 Allocation of gearbox to engine
  • 2.1.1 Allocation - Audi A4 2008 ►
  • 2.1.2 Allocation - Audi A5 Coupé 2008 ►, Audi A5 Sportback 2010 ►
  • 2.1.3 Allocation - Audi A5 Cabriolet 2009 ►
  • 2.1.4 Allocation - Audi Q5 2008 ►
  • 2.2 Capacities
  • 3 Transmission layout
  • 3.1 Transmission layout - front‑wheel drive
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Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002

Workshop Manual
Years: 1997 Manual in English Pages: 283 4.3 MB
Short description

Service manual for Audi A3 (1997) 1.6L 4‑cylinder (2‑valve) engines (codes AEH, AKL, APF). Includes technical data, engine removal/installation, crankshaft group, cylinder head and valve gear, lubrication, cooling and exhaust system procedures. Edition 07.2002.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data ............................................................1
  • 1 Technical data ............................................................1
  • 1.1 Technical data .......................................................1
  • 1.2 Engine number .......................................................1
  • 1.3 Engine data ........................................................1
  • 10 - Removing and installing engine ..........................................3
  • 1 Removing and installing engine .........................................3
  • 1.1 Removing and installing engine ....................................3
  • 1.2 Removing - vehicles with engine codes AEH, AKL .....................4
  • 1.3 Removing - vehicles with engine code APF ..........................18
  • 1.4 Detaching engine from gearbox ...................................35
  • 1.5 Attaching engine to repair stand ................................38
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AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017

Workshop Manual
Years: 2004 Manual in English Pages: 235 3.8 MB
Short description

Official workshop manual for the Audi A3 2.0L FSI turbo engine (mechanics). Includes step‑by‑step removal/install procedures, technical data, tightening torques and diagnostic/repair instructions. Intended for professional garages and experienced technicians.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (code letters AXX, BPY, BWA, BHZ, BZC, CDL — capacity, power, torque, bore/stroke, compression, ignition)
  • 3 Safety precautions
  • 3.1 Working on the fuel system
  • 3.2 Procedure before opening high-pressure section
  • 3.3 Working on the cooling system
  • 3.4 Using testers during road test
  • 3.5 Working on the exhaust system
  • 4 General repair instructions
  • 4.1 Cleanliness rules for fuel/injection/turbo
  • 4.2 Checking fuel system for leaks
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Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)

Workshop Manual
Years: 2004 Manual in English Pages: 150 68.2 MB
Short description

Workshop manual for the Audi A3 (2004) — Electrical system. Includes procedures for battery, starter, alternator, gauges, wipers, exterior/interior lighting and wiring. Edition 02.2018.

199,00 UAH
Contents
Key sections:
  • List of Workshop Manual Repair Groups
  • - 27 Starter, current supply, CCS
  • - 90 Gauges, instruments
  • - 92 Windscreen wash/wipe system
  • - 94 Lights, bulbs, switches - exterior
  • - 96 Lights, bulbs, switches - interior
  • - 97 Wiring
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
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Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007

Workshop Manual
Years: 2001–2003 Manual in English Pages: 307 7.3 MB
Short description

Comprehensive workshop manual for Audi A4 (2001) and A4 Cabriolet (2003) with the 4.2 L V8, 5‑valve engine with timing chains (Engine IDs BBK/BHF). Includes step‑by‑step procedures for engine removal/installation, crankshaft and timing chain service, cylinder head/valve gear, lubrication, cooling and exhaust system repairs. Intended for professional technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Engine number
  • 2 Engine data (Codes: BBK / BHF; 4.163 l; 253 kW @7000 rpm; torque 410–420 Nm; bore 84.5 mm; stroke 92.8 mm; compression ratio 11.5; RON 98)
  • 3 Safety precautions
  • 4 General repair instructions (cleanliness, fuel system, contact corrosion)
  • 10 - Removing and installing engine
  • 1 Removing engine - vehicles with manual gearbox
  • 1.1 Removing engine (tools, drain fluids, remove bumper, lock carrier, disconnect wiring, fuel, coolant, A/C lines, suspension components, propshaft, exhaust, support engine on platform, lower assembly)
  • 1.2 Separating engine and gearbox (subframe removal, support sets, remove front exhaust pipes, bolt sequence)
  • 1.3 Securing engine to engine and gearbox stand (lifting tackle, VAS 6095 support)
  • 1.4 Installing engine (clutch remarks, alignment, torque values)
  • 2 Removing and installing engine - vehicles with automatic gearbox (procedure parallels manual gearbox with ATF/torque converter notes)
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Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)

Workshop Manual
Years: 2001 Manual in English Pages: 259 2.0 MB
Short description

Workshop Manual for Audi A4 and A4 Cabriolet — Auxiliary Heater (Edition 08.2004). Contains self-diagnosis procedures, fault tables, electrical and fuel system checks, final control tests, CO₂ exhaust adjustment and step-by-step removal/installation and repair procedures. Intended for professional workshop use.

199,00 UAH
Contents
Key sections:
  • 01 - Self-diagnosis, electrical checks
  • 1 Auxiliary heater self-diagnosis
  • 1.1 Technical data of self-diagnosis
  • 1.2 Function
  • 1.3 Fault recognition
  • 1.4 Guided fault-finding
  • 1.5 Technical data of self-diagnosis
  • 1.6 Test requirements for self-diagnosis
  • 1.7 Safety precautions
  • 2 Self-diagnosis procedure
  • 2.1 Connecting vehicle diagnostic VAS 5051A/K-wire adapter
  • 2.1.1 Control unit identification
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Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)

Workshop Manual
Years: 2001 Manual in English Pages: 34 851.0 KB
Short description

Service manual for Audi A4 (2001‑) and A4 Cabriolet (2003‑) with 1.8L 4‑cylinder turbo engines. Covers Motronic fuel injection and ignition systems, diagnostic and maintenance procedures. Includes technical data, removal/installation steps and system checks.

199,00 UAH
Contents
Key sections:
  • 24 - Mixture preparation - injection
  • 1 Safety precautions and rules for cleanliness
  • 1.1 General notes on self-diagnosis
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Rules for cleanliness and instructions for working on fuel system
  • 1.4 Checking vacuum system
  • 2 Injection system
  • 2.1 Technical data
  • 2.2 Overview of fitting locations - injection system
  • 3 Intake manifold
  • 3.1 Exploded view - intake manifold
  • 3.2 Removing and installing intake manifold
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)

Workshop Manual
Years: 2003 Manual in English Pages: 369 9.1 MB
Short description

Comprehensive workshop manual for the Audi A8 (2003) electrical system — Edition 08.2014. Covers battery, alternator, starter, instrument cluster, wiper/washer systems, exterior/interior lighting and wiring repair procedures with step-by-step illustrations. Includes diagnostic and adjustment procedures and torque/data specifications.

199,00 UAH
Contents
Key sections:
  • 27 - Starter, current supply, CCS
  • 1 Contact corrosion
  • 2 Battery
  • 2.1 Battery - general notes
  • 2.2 Maintenance-free batteries
  • 2.3 Disconnecting and connecting battery
  • 2.4 Removing and installing battery
  • - Remove luggage compartment side trim (right-side)
  • - Connect battery charger for back-up power
  • - Detach earth and positive cables, central venting hose
  • - Remove battery retainer plate and lift battery out
  • - Installation notes, adaptation via Vehicle diagnostic tester
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685

Workshop Manual
Years: 2021 Manual in English Pages: 186 82.7 MB
Short description

Official Audi Service Training self‑study programme SSP 685 for the Audi Q4 e‑tron (Type F4). Covers body, power units, power transmission, running gear, electrics & electronics, high‑voltage system, thermal management, driver assist and infotainment. Intended for internal service training and technical familiarisation; not a workshop repair manual.

199,00 UAH
Contents
Key sections:
  • Introduction
  • - Introduction to Audi Q4 e-tron
  • - Dimensions
  • Body
  • - Body structure and materials
  • - Joining techniques
  • - Securing high-voltage battery and force progression
  • - Body assembly (doors, rear lid, panoramic sunroof)
  • - Dash panel and centre console
  • Power units
  • - Technical data: rear electric motor (VX90)
  • - Technical data: front electric motor (VX89)
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Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)

Workshop Manual
Years: 2018 Manual in English Pages: 645 14.8 MB
Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

199,00 UAH
Contents
Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
  • 1.2 Safety precautions when using testers and measuring instruments during a road test
  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
  • 2.3 Contact corrosion
  • 2.4 ESD (electrostatic discharge) workplace
  • 2.5 Routing and attachment of lines and wiring
  • 2.6 Identification plates
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)

Workshop Manual
Years: 2008–2019 Manual in English Pages: 128 11.1 MB
Short description

Service manual for the 7‑Speed dual‑clutch (DSG) transmissions 0CJ/0CL/0CK/0DN/0DP/0HL fitted to various Audi models. Includes repair information, clutch and gearbox disassembly/assembly, mechatronic and hydraulic system procedures, seals and differential work. Edition 05.2018.

199,00 UAH
Contents
Key sections:
  • 00 - General, Technical Data
  • 1 Repair Information
  • 1.1 General Repair Information
  • 1.2 Contact Corrosion
  • 1.3 ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir
  • 2 Rules for Cleanliness when Working on DSG® Transmission
  • 30 - Clutch
  • 1 Clutch
  • 1.1 Overview - Flywheel and Dual Clutch
  • 1.2 Flywheel, Removing and Installing
  • 1.3 Dual Clutch, Removing and Installing
  • 1.4 Input Shaft Seal, Replacing
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LAND ROVER 3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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Code

P1516

PORSCHE P — Powertrain

Intake manifold resonance flap

Brand: PORSCHE
Type: P — Powertrain
Views: UK: 8 EN: 13 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

SATURN P — Powertrain

Throttle Actuator Control TAC Module Throttle Actuator Position Performance

Brand: SATURN
Type: P — Powertrain
Views: UK: 25 EN: 56 RU: 38
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

SUBARU P — Powertrain

Idle Air Control Solenoid Signal 4 Circuit Low Input

Brand: SUBARU
Type: P — Powertrain
Views: UK: 22 EN: 51 RU: 39
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1516

VOLKSWAGEN P — Powertrain

Intake Manifold Changeover Valve Circuit Open

Brand: VOLKSWAGEN
Type: P — Powertrain
Views: UK: 24 EN: 52 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty electronic throttle body / throttle actuator (TAC) assembly
  • Throttle position sensor(s) or accelerator pedal position sensor(s) failure or incorrect correlation
  • Open, shorted or corroded wiring/connectors between TAC, pedal sensors and PCM/ECM
  • Poor 5 V reference, ground, or battery/charging system issues
  • Carbon buildup or mechanical binding in throttle plate
  • PCM/ECM software bug or internal fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine power / limp-home mode
  • Delayed, erratic or no throttle response to accelerator pedal
  • Surging or unstable idle
  • Engine may refuse to increase RPM or sudden loss of power

What to check

  • Read stored and pending DTCs and freeze frame data with a scan tool; note related codes
  • Verify battery voltage (should be ≈12–14.5 V) and charging system operation
  • Visual inspection: wiring harness, connectors, signs of water intrusion, corrosion or damage at throttle body and pedal sensor connectors
  • Check for obvious carbon buildup or mechanical obstruction on throttle plate
  • Check for TSBs or software updates for throttle control on this model/year

Signal parameters

  • Accelerator pedal sensor A/B correlation: both pedals should track linearly; difference typically
  • Throttle position (actual) vs commanded: delta normally very small (manufacturer-specific). A typical acceptable difference is
  • Throttle position sensor (TPS) voltages: closed throttle ≈0.4–1.0 V, wide open ≈4.0–4.8 V (varies by design)
  • 5 V reference present and stable to pedal and TPS circuits (approx. 5 V ±0.25 V)
  • Good sensor ground (low resistance to chassis ground)
  • Battery voltage under load should remain >11 V during tests

Diagnostic algorithm

  1. Use a quality scan tool, record all DTCs, freeze frame, and live data: monitor accelerator pedal % (both sensors if present), commanded throttle position, and actual throttle position while key ON and during engine run.
  2. Attempt to reproduce the fault while observing live data: note discrepancies between commanded and actual throttle position and any fault set timing.
  3. Perform a visual and physical inspection of connectors and wiring to the throttle body and pedal module. Repair any damaged insulation, pins, or corroded connectors.
  4. Check power/ground/5 V reference at throttle body and pedal sensors with key ON. Do not backprobe with engine running if unsafe—take precautions.
  5. Verify pedal sensor correlation: compare sensor A vs B signals across pedal travel; replace pedal module if sensors disagree or are noisy.
  6. Inspect and clean throttle body (carbon/soot) if mechanical sticking is suspected. After cleaning, perform throttle relearn/idle relearn per service procedure.
  7. Using live data, command throttle open with scan tool and compare commanded vs actual response. If throttle does not move or lags significantly, suspect TAC motor or internal sensor failure.
  8. If wiring and sensors check OK, perform continuity and resistance checks on suspect circuits; use an oscilloscope for intermittent/noisy signals if available.
  9. Check for recent software updates or service bulletins. Perform throttle body relearn/calibration and clear codes, then retest road/driving cycle to confirm.
  10. If fault persists after wiring, sensors, cleaning and recalibration, consider replacement of the throttle body/TAC assembly. Replace PCM only after exhaustive testing shows module fault and after verifying no software update is available.
  11. After repair, clear codes, perform relearn procedures and verify repair with a full drive cycle and scan tool monitoring to ensure the commanded vs actual positions match.

Likely causes

  • Contaminated or sticking throttle body causing position not to follow command
  • Faulty throttle actuator (motor) or throttle position sensor inside TAC assembly
  • Wiring harness connector corrosion, damaged pins, or intermittent open/short to sensor circuits
  • Incorrect/failed throttle body calibration (learn) or required software update

Fault status

⚠️ Status
Stored when the throttle actuator control system detects that the throttle actuator position feedback does not perform within expected parameters or does not follow commanded position; often triggers reduced power (limp) mode and MIL illumination.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0121 P0122 P0123 P2111 P2112 P2106
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