Code
DF887
RENAULT
D
-> P0226 - Brake Pedal Position/ accelerator
AI status
Completed
Completed
100%
Causes
- Faulty accelerator/throttle pedal position sensor (APPS/PPTS)
- Damaged wiring or poor connector (open, short to ground or battery, intermittent)
- Incorrect sensor reference voltage or ground
- Faulty brake light / brake pedal position switch causing conflicting inputs
- ECU/software calibration or internal fault
- Mechanical binding or pedaler assembly misalignment
Symptoms
- MIL/Check Engine lamp illuminated
- Reduced engine power / limp mode
- Cruise control disabled or unavailable
- Unstable idle or hesitation on throttle input
- Possible inability to start or inconsistent throttle response
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Check live data: accelerator pedal position(s) and brake switch status while operating pedals
- Inspect sensor connector and wiring harness for corrosion, damage, or loose pins
- Back-probe sensor connector: verify reference voltage (~5 V), signal voltage and ground
- Wiggle test wiring while observing live data for intermittent changes
- Compare sensor output to expected range at rest and through full travel
Signal parameters
- Reference voltage: typically ~5.0 V (check vehicle spec)
- Sensor output (idle/rest): commonly ~0.5–1.0 V (varies by design)
- Sensor output (full travel): commonly ~4.0–4.5 V (varies by design)
- Expected smooth, monotonic change in voltage with pedal travel (no jumps)
- Dual-sensor systems: sensor outputs should correlate and stay within manufacturer tolerance
Diagnostic algorithm
- Safety: Park vehicle, key off, secure vehicle. Disable battery only if instructed by service manual.
- Scan: Connect diagnostic tool, read all DTCs, save freeze-frame and live data.
- Reproduce: With scanner on, observe live values while slowly pressing/releasing accelerator and brake pedals. Note any erratic or out-of-range readings.
- Visual: Inspect pedal module, connectors and harness for damage, corroded pins, or water ingress.
- Electrical: Back-probe the pedal sensor connector. Confirm reference voltage (~5 V) and good ground with key on. Measure signal voltage at rest and full travel.
- Correlation: If dual sensors present, verify both sensor outputs correlate as pedal moves. If outputs disagree beyond tolerance, suspect sensor or harness.
- Wiggle test: Move harness and connectors while watching live data to find intermittent faults.
- Check brake switch: Verify brake switch state and wiring; a stuck or misreporting brake switch can affect interlock logic.
- Repair/replace: Repair damaged wiring/connectors or replace faulty pedal position sensor. Use OEM parts and follow torque/calibration procedures.
- Clear codes & verify: Clear DTCs, perform key-on self tests and road test to confirm the fault does not return. If DTC returns, consider ECU input fault and perform further module testing or replacement per service manual.
Likely causes
- Wiring connector corrosion or pin damage at pedal module
- Sensor internal failure (output out of range or intermittent)
- Short circuit to 12V or ground in sensor signal
- Failed brake switch sending unexpected signal (interlock logic)
- ECU sensor input damage (less common)
Fault status
Status
DF887 / P0226 — Pedal/throttle position signal out of expected range or correlation fault. Check pedal sensor, wiring/connectors, brake switch and ECU inputs.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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