Code
P1161
CITROEN
P — Powertrain
Motorised throttle position coherence
Views:
UK: 3
EN: 2
RU: 6
AI status
Completed
Completed
100%
Causes
- Faulty motorised throttle body (actuator or position sensor)
- Contaminated or mechanically sticking throttle plate
- Damaged wiring or poor connector connections (power, ground, signal) to throttle motor or TPS
- Faulty accelerator pedal position sensor(s) or sensor correlation error
- ECU/software calibration fault or corrupted adaptation values
- Intermittent short/open in sensor/actuator circuits
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power / limp-home mode
- Poor throttle response, hesitation or surging
- Unstable idle or stalling on decel/idle
- Sudden loss of acceleration or inconsistent acceleration
What to check
- Read stored DTCs and freeze-frame data with a compatible scan tool
- Observe live data: commanded throttle position (target), actual throttle plate position, throttle motor duty/current, accelerator pedal sensor(s) values and correlation
- Compare requested vs actual angles and check for lag or offsets
- Check for pending or related codes (pedal sensors, TPS, motor circuits)
- Visually inspect throttle body, connector and wiring for damage, corrosion, or looseness
- Perform wiggle test on harness while monitoring live data for intermittent changes
Signal parameters
- Accelerator pedal sensor voltages: typically ~0.5 V (idle) to ~4.5 V (wide open) per sensor
- Throttle position sensor output: ~0.5–4.5 V (angle-dependent) or encoder counts matching commanded angle
- Target throttle angle vs actual throttle angle: difference should be minimal (manufacturer-specific tolerance, typically a few degrees)
- Throttle motor duty cycle or current: varies with demand — look for saturation or erratic values
- Reference voltage present and stable at sensor connector (≈5 V)
Diagnostic algorithm
- Connect a full-function scan tool, record fault(s) and freeze-frame. Clear codes and attempt to reproduce fault under controlled conditions.
- With key ON engine OFF, compare accelerator pedal sensor A/B outputs; verify correlation and expected voltages. Replace pedal sensor if out of range or inconsistent.
- With scan tool viewing live data, command throttle changes (via pedal) and observe target vs actual throttle position and motor duty/current. Note any delay, nonlinearity or stuck values.
- Inspect connector and wiring at the throttle body and ECU for corrosion, pin damage, looseness or water intrusion. Repair as needed. Perform continuity and resistance checks to ECU following wiring diagram.
- Check power and ground circuits to the throttle body (5 V reference, battery power, ground). Repair any supply faults.
- Remove and inspect throttle body for carbon build-up or mechanical obstruction. Clean per service procedure if contaminated; re-test.
- Perform throttle body adaptation/relearn procedure per manufacturer instructions after cleaning or replacement.
- If wiring, power and mechanics check good but fault persists, consider replacing throttle body (actuator + sensor assembly). Ensure any ECU software updates or calibrations are applied.
- After repairs, clear codes and road-test to verify repair. Monitor for recurrence before finalizing repair.
Likely causes
- Throttle body actuator failure or worn gearbox
- Failed throttle position sensor(s) or encoder inside the throttle body
- Open/short or high resistance in harness between ECU and throttle body
- Throttle plate mechanically sticking from carbon deposits
- Failed accelerator pedal sensor causing mismatch in pedal vs throttle signals
Fault status
Status
MIL illuminated; engine control module has stored a throttle position coherence fault and may have activated reduced power mode.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.0 hours
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