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Home / DTC / P1680 — Motorised throttle spring fault

P1680 — Motorised throttle spring fault

Detailed page for trouble code P1680.

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P1680

ALFA ROMEO P — Powertrain

Motorised throttle spring fault

Brand: ALFA ROMEO
Type: P — Powertrain
Views: UK: 6 EN: 2 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

BUICK P — Powertrain

Driver 5

Brand: BUICK
Type: P — Powertrain
Views: UK: 23 EN: 30 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

CADILLAC P — Powertrain

Driver 5

Brand: CADILLAC
Type: P — Powertrain
Views: UK: 24 EN: 29 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
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Code

P1680

CHEVROLET P — Powertrain

Driver 5

Brand: CHEVROLET
Type: P — Powertrain
Views: UK: 18 EN: 32 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
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Code

P1680

CHRYSLER P — Powertrain

Clutch Released Switch Circuit Open Or Shorted

Brand: CHRYSLER
Type: P — Powertrain
Views: UK: 23 EN: 30 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

DODGE P — Powertrain

Clutch Released Switch Circuit Open Or Shorted

Brand: DODGE
Type: P — Powertrain
Views: UK: 22 EN: 32 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

FIAT P — Powertrain

Motorised throttle spring fault

Brand: FIAT
Type: P — Powertrain
Views: UK: 6 EN: 5 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

GM P — Powertrain

Driver 5

Brand: GM
Type: P — Powertrain
Views: UK: 20 EN: 30 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

GMC P — Powertrain

Driver 5

Brand: GMC
Type: P — Powertrain
Views: UK: 22 EN: 34 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

HUMMER P — Powertrain

Driver 5 (ECU Malfunction)

Brand: HUMMER
Type: P — Powertrain
Views: UK: 15 EN: 17 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

JEEP P — Powertrain

Clutch Released Switch Circuit Open Or Shorted

Brand: JEEP
Type: P — Powertrain
Views: UK: 23 EN: 40 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

MAZDA P — Powertrain

Metering Oil Pump Failure

Brand: MAZDA
Type: P — Powertrain
Views: UK: 23 EN: 29 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

MINI P — Powertrain

Electronic throttle control monitor level 2/3 - ADC processor fault

Brand: MINI
Type: P — Powertrain
Views: UK: 0 EN: 0 RU: 0
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
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Send to email
Code

P1680

OLDSMOBILE P — Powertrain

Driver 5

Brand: OLDSMOBILE
Type: P — Powertrain
Views: UK: 23 EN: 32 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

Other P — Powertrain

Metering Oil Pump Malfunction

Brand: Other
Type: P — Powertrain
Views: UK: 22 EN: 30 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
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Code

P1680

PLYMOUTH P — Powertrain

Clutch Released Switch Circuit Open Or Shorted

Brand: PLYMOUTH
Type: P — Powertrain
Views: UK: 24 EN: 40 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

PONTIAC P — Powertrain

Clutch Released Switch Circuit Open Or Shorted

Brand: PONTIAC
Type: P — Powertrain
Views: UK: 21 EN: 30 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

RAM P — Powertrain

Clutch released switch circuit

Brand: RAM
Type: P — Powertrain
Views: UK: 0 EN: 1 RU: 0
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

SAAB P — Powertrain

Secondary Air Injection Relay Open Or Short Circuit

Brand: SAAB
Type: P — Powertrain
Views: UK: 1 EN: 0 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1680

SATURN P — Powertrain

Driver 5

Brand: SATURN
Type: P — Powertrain
Views: UK: 20 EN: 31 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Mechanical failure of throttle body return spring (broken or fatigued)
  • Seized or binding throttle plate/shaft due to carbon or contamination
  • Internal failure in the motorised throttle actuator assembly
  • Incorrect assembly or missing spring after service/repair
  • Damaged or disconnected throttle body mounting/linkage
  • Intermittent or failed electrical supply to throttle actuator motor

Symptoms

  • MIL/Check Engine lamp illuminated
  • Reduced engine power / limp-home mode
  • Poor or delayed throttle response
  • Unstable idle, stalling, or inability to maintain idle
  • Throttle pedal feels normal but engine does not follow expected response
  • Throttle adaptation or self-test warnings after service

What to check

  • Read and record all stored codes and freeze-frame data with a dealer-level or OEM-capable scanner.
  • Observe live data: commanded throttle plate angle vs actual throttle plate angle, pedal position sensors, actuator torque/current where available.
  • Perform visual inspection of throttle body for carbon, debris, damaged spring or obvious mechanical damage.
  • Manually operate throttle plate (engine off) to check free movement and spring return tension.
  • Check wiring and connector at the throttle body for corrosion, damage, or poor contact.
  • Measure supply voltage and ground at the actuator connector with ignition on.

Signal parameters

  • Accelerator pedal sensor outputs typically vary between ~0.5 V (rest) and ~4.5 V (full pedal) — compare both pedal sensors for correlation.
  • Throttle position sensor (TPS) angle/voltage should change smoothly when commanded and match pedal input; closed throttle often near ~0.5–1.5 V, wide open near ~3.5–4.5 V (refer to factory spec).
  • Actuator motor supply: battery voltage (~12 V) present at power pin with ignition on — no large voltage drop under command.
  • Actuator motor resistance: typically low ohms; check against OE specification. Excessive resistance or open circuit indicates internal failure.
  • Current draw: actuator should draw higher current while moving but should not remain at a high draw at rest — excessive continuous current can indicate binding or seized spring.

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and record all DTCs and live data. Note freeze frame conditions and any related throttle or pedal codes.
  2. Attempt to replicate the fault condition and monitor commanded vs actual throttle plate position and accelerator pedal sensor outputs.
  3. Visually inspect the throttle body and intake for carbon, deposits, foreign objects, and check the return spring (if accessible) for breakage or incorrect fit.
  4. With ignition off, manually move the throttle plate to check for smooth travel and audible/feelable spring return. Confirm the plate returns to closed position reliably.
  5. Inspect electrical connector and wiring to the throttle body. Back-probe connector with ignition on and measure supply voltage, ground continuity, and sensor voltages. Repair any wiring/connectors as needed.
  6. If mechanical binding is present, remove the throttle body for detailed inspection and cleaning. If a spring is missing or broken, replace the throttle body or actuator assembly per OEM instructions.
  7. If electrical fault suspected (actuator motor or internal gears), perform actuator bench test or replace the complete throttle body/actuator unit according to manufacturer guidance.
  8. After repair or replacement, clear codes, perform throttle adaptation/learn procedure using OEM diagnostic tool, and road-test to confirm fault does not return.
  9. If code persists after mechanical and electrical checks, update ECU software if available and consult OEM technical bulletins for known issues.

Likely causes

  • Broken or weak return spring inside the motorised throttle body
  • Throttle plate sticking from carbon build-up or foreign debris
  • Failed throttle actuator (motor/gears) that cannot control/return the plate
  • Throttle body removed and re-fitted without correct spring or incorrect orientation
  • Wiring connector corrosion or intermittent power/ground to the actuator

Fault status

⚠️ Status
Motorised throttle spring fault detected. ECU has identified abnormal throttle return behavior—possible broken/weak return spring, binding throttle plate, or actuator failure. Engine may enter reduced power mode.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.5 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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