Code
P2102
Generic
P — Powertrain
Throttle Actuator A Control Motor Circuit Low
Views:
UK: 41
EN: 84
RU: 45
AI status
Completed
Completed
100%
Causes
- Open or short to ground in throttle actuator (motor) control circuit
- Corroded, loose or damaged connector at throttle body
- Failed throttle actuator (motor) or internal throttle body electronics
- Blown fuse or poor power supply to throttle module
- Poor engine ground near throttle body or battery
- ECM/PCM output driver fault
Symptoms
- Check Engine MIL illuminated
- Reduced engine power / limp mode
- Poor or delayed throttle response and acceleration
- Engine may stall or idle irregularly
- Throttle pedal input has little or no effect
What to check
- Read freeze frame data and related DTCs with a scan tool
- Visually inspect throttle body connector, wiring, and engine grounds
- Verify battery voltage and charging system operation
- Check fuses and power supply circuits to the throttle module
- Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
- Measure resistance/continuity of motor windings and check for shorts to ground
Signal parameters
- Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
- Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
- No continuity to ground on control signal pins (should be isolated except when driven)
- Current draw increases when motor is commanded; excessive current may indicate motor stall or short
- When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
- Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
- Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
- Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
- Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
- Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
- Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
- Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
- If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
- After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
- If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.
Likely causes
- Damaged wiring harness or pin(s) at the throttle body connector
- Corroded/contaminated connector or terminals
- Failed throttle actuator motor or internal control module
- Blown fuse or weak battery/low system voltage
- Faulty ECM output stage (less common)
Fault status
Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P2102
LAND ROVER
P — Powertrain
Throttle actuator control motor - low circuit
Views:
UK: 20
EN: 37
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short to ground in throttle actuator (motor) control circuit
- Corroded, loose or damaged connector at throttle body
- Failed throttle actuator (motor) or internal throttle body electronics
- Blown fuse or poor power supply to throttle module
- Poor engine ground near throttle body or battery
- ECM/PCM output driver fault
Symptoms
- Check Engine MIL illuminated
- Reduced engine power / limp mode
- Poor or delayed throttle response and acceleration
- Engine may stall or idle irregularly
- Throttle pedal input has little or no effect
What to check
- Read freeze frame data and related DTCs with a scan tool
- Visually inspect throttle body connector, wiring, and engine grounds
- Verify battery voltage and charging system operation
- Check fuses and power supply circuits to the throttle module
- Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
- Measure resistance/continuity of motor windings and check for shorts to ground
Signal parameters
- Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
- Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
- No continuity to ground on control signal pins (should be isolated except when driven)
- Current draw increases when motor is commanded; excessive current may indicate motor stall or short
- When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
- Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
- Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
- Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
- Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
- Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
- Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
- Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
- If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
- After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
- If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.
Likely causes
- Damaged wiring harness or pin(s) at the throttle body connector
- Corroded/contaminated connector or terminals
- Failed throttle actuator motor or internal control module
- Blown fuse or weak battery/low system voltage
- Faulty ECM output stage (less common)
Fault status
Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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+100 karma for a short comment :)
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Code
P2102
MITSUBISHI
P — Powertrain
ETV motor circuit(shorted low)
Views:
UK: 26
EN: 38
RU: 33
AI status
Completed
Completed
100%
Causes
- Open or short to ground in throttle actuator (motor) control circuit
- Corroded, loose or damaged connector at throttle body
- Failed throttle actuator (motor) or internal throttle body electronics
- Blown fuse or poor power supply to throttle module
- Poor engine ground near throttle body or battery
- ECM/PCM output driver fault
Symptoms
- Check Engine MIL illuminated
- Reduced engine power / limp mode
- Poor or delayed throttle response and acceleration
- Engine may stall or idle irregularly
- Throttle pedal input has little or no effect
What to check
- Read freeze frame data and related DTCs with a scan tool
- Visually inspect throttle body connector, wiring, and engine grounds
- Verify battery voltage and charging system operation
- Check fuses and power supply circuits to the throttle module
- Backprobe throttle actuator motor pins and measure voltage while commanding throttle with scan tool
- Measure resistance/continuity of motor windings and check for shorts to ground
Signal parameters
- Expected: Motor control circuit should switch between ~0V and near battery (approx. 11–14V) or a PWM signal when commanded; a steady low (
- Motor coil resistance (typical): low ohms range — continuity expected (manufacturer spec varies; commonly a few ohms)
- No continuity to ground on control signal pins (should be isolated except when driven)
- Current draw increases when motor is commanded; excessive current may indicate motor stall or short
- When idle/no-command, some control pins may be near 0V; when commanded, voltage/PWM duty should change
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data; note ignition state and engine conditions.
- Visually inspect throttle body connector, wiring harness, and related grounds for damage, corrosion, or loose pins.
- Verify battery voltage (key ON, engine OFF) is within normal range (≈12.0–12.8 V). Check charging system under load if needed.
- Check relevant fuses/relays for the throttle actuator/ECM power feed and replace if blown.
- Backprobe the throttle actuator motor connector. With key ON, measure reference and control voltages to identify permanently low lines.
- Use a scan tool to command the throttle actuator while observing voltages/waveforms at the motor connector. Look for expected switching or PWM activity when commanded.
- Measure motor winding resistance and check for short to ground/short between coils. Replace throttle body if motor windings are open/shorted or out of spec.
- Wiggle test harness while monitoring the circuit for intermittent drops; repair broken wiring or terminals as required.
- If wiring and motor check good, test ECM output driver by checking for correct commanded signals; if ECM output is absent despite correct commands and wiring, consider ECM fault.
- After repairs, clear codes, perform relearn or throttle adaptation procedure if required by manufacturer, then road test to confirm resolution.
- If problem is intermittent and not reproduced, consider extended road test or monitoring with data logger.
Likely causes
- Damaged wiring harness or pin(s) at the throttle body connector
- Corroded/contaminated connector or terminals
- Failed throttle actuator motor or internal control module
- Blown fuse or weak battery/low system voltage
- Faulty ECM output stage (less common)
Fault status
Status
Throttle Actuator A control motor circuit low — control circuit voltage below expected threshold. May cause reduced engine power and trigger limp mode.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email