Code
P1152
DS
P — Powertrain
Throttle control
Views:
UK: 2
EN: 5
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty electronic throttle body (motor or gearbox)
- Defective throttle position sensor (TPS) or accelerator pedal position sensor (APP)
- Damaged or corroded wiring, connectors or grounds in the throttle/pedal circuits
- ECU/software calibration or firmware error
- Mechanical binding or carbon build-up on throttle plate
- Intermittent CAN / communication errors between modules
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced engine power / limp-home mode
- Rough idle or unstable idle speed
- Delayed or unresponsive throttle response / poor acceleration
- Surging or unexpected throttle opening
- Stored freeze frame data showing abnormal throttle/pedal values
What to check
- Read and record DTCs and freeze frame with a diagnostic scanner; clear and see if code returns
- Check live data: throttle angle (actual), throttle command (target), APP sensor 1 & 2 values, and pedal correlation
- Inspect wiring and connectors at throttle body, pedal assembly and ECU for corrosion, damage or loose pins
- Perform wiggle test on harness while monitoring live data for intermittent jumps or dropouts
- Measure reference voltage (typically 5 V) and ground continuity at sensors with key on, engine off
- Visually inspect throttle body for carbon build-up or mechanical obstruction; check for free movement of throttle plate
Signal parameters
- APP sensor(s): two independent signals, Vref ≈ 5.0 V, signal range ≈ 0.2–4.8 V (one signal usually increases as pedal is pressed, the other often shows an inverse or different curve)
- TPS / Throttle position (actual): 0.2–1.0 V at closed throttle rising toward 4.5–4.8 V at wide open (manufacturer-specific)
- Throttle command (target) vs actual throttle angle (degrees) — small commanded/actual deviation at steady state
- Throttle motor supply: battery / fused supply ≈ 12 V (switched); motor drive often PWM from ECU
- Motor current can rise when motor is commanded to move; excessive current may indicate binding or motor fault
- CAN/Circuit voltages: 9–16 V supply range, CAN high/low differential signals ~2.5 V idle
Diagnostic algorithm
- Capture DTC(s) and freeze frame using a capable scan tool; note all related codes and live data values.
- Inspect connectors and wiring at throttle body and accelerator pedal for corrosion, damage or loose pins. Repair or reconnect as necessary.
- With ignition on (engine off) monitor APP sensor 1 & 2 voltages while slowly pressing the pedal. Verify smooth, correlated signals and correct Vref (≈5 V). If sensors disagree or show implausible values, suspect APP or harness fault.
- With engine off, probe TPS/throttle position signal at throttle body. Manually (with care) move the throttle plate and observe smooth change in position voltage. Check for mechanical binding or carbon build-up; clean throttle body if needed.
- Check ground and power supply at throttle body for proper voltage and low resistance to battery ground. Repair any poor grounds or supply faults.
- Perform wiggle test on harness connectors while monitoring live data for intermittent faults. Use backprobe or scope where appropriate.
- If electronic values are plausible but throttle does not move to commanded position, check motor drive signals (PWM) with oscilloscope while commanding throttle from scan tool. Absence of drive suggests ECU or wiring issue; abnormal motor current suggests motor/mechanical problem.
- Check for related CAN/ECU errors and ensure software is up to date. If multiple modules report faults, consider communication bus troubleshooting.
- After repairs or cleaning, perform throttle relearn/initialization per DS service procedure and retest under load. Clear codes and verify no reoccurrence.
- If tests indicate ECU failure (rare), confirm with manufacturer procedures before replacement.
Likely causes
- Throttle body motor or position sensor failure
- Corroded connector or broken wire in TPS/APP harness
- Faulty accelerator pedal position sensor or out-of-spec sensor correlation
- Carbon deposits preventing throttle plate movement
- ECU detecting inconsistent signals and forcing limp mode
Fault status
Status
Electronic throttle control fault detected — ECU logged fault due to unexpected or inconsistent throttle/pedal signals or actuator behavior; vehicle may be in reduced power (limp) mode.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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