Circuit/System Testing

Ignition ON.
Verify that DTC C0131 4B is not set.
- If DTC C0131 4B is set
  Perform the Brake Pressure Modulator Valve Pressure Sensor Calibration .
- If DTC C0131 4B is not set
Verify the brake pedal position sensor or the brake pedal is not binding causing residual brake pressure to be detected.
- If a condition is found
  Repair or replace the applicable component.
- If a condition is not found
Verify that DTC C0131 does not set while operating the vehicle under the Conditions for Running the DTC.
- If DTC C0131 sets
1. Replace the Q5 Brake Pressure Modulator.
2. Verify the DTC does not set while driving the vehicle under normal braking conditions.
  - If the DTC sets, replace the K17 Electronic Brake Control Module.
  - If the DTC does not set.
3. All OK.
- If DTC C0131 does not set
All OK.