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Circuit/System Testing

NOTE:

Fix any Brake System related DTCs or symptoms before using this diagnostic.

  1. Ignition ON, perform the brake pedal position (BPP) sensor calibration procedure and verify the BPP is calibrated properly. Refer to Brake Pedal Position Sensor Calibration .
    • If the BPP sensor will not calibrate properly, replace the BPP sensor.
  2. Ignition ON, apply the brake pedal and verify the scan tool BPP sensor parameter is Applied.
    • If the parameter reads Released, test the BPP sensor signal circuit for an open/high resistance or short to ground. If circuit tests normal, replace the ECM.
  3. Apply the brake pedal, verify the brake lamps are illuminated.
  4. If all circuits test normal, replace the ECM.
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