PINPOINT TEST J: DTCs C1288, C1440 AND C1446

J1 MONITOR THE ABS MODULE BRAKE ON/OFF (BOO_ABS) PID
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
- Press and release the brake pedal while monitoring the BOO_ABS PID.
- Does the PID switch to ON with the brake pedal pressed and then to OFF with the brake pedal released?
- Yes : GO to J3.
- No : GO to J2.
J2 MONITOR THE PCM BRAKE ON/OFF (BOO) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- Press and release the brake pedal while monitoring the BOO PID.
- Does the PID switch to ON with the brake pedal pressed and then to OFF with the brake pedal released?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK article to continue diagnosis of the HS-CAN bus.
- No : REFER to EXTERIOR LIGHTING SYSTEM article to continue diagnosis of the stoplamp switch and stoplamps.
J3 MONITOR THE INITIAL (BRAKE PEDAL NOT APPLIED) BRAKE PRESSURE USING THE ABS MODULE BRAKE PRESSURE (BRAKPRESS) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
  NOTE: It is normal for the brake pressure (BRAKPRES) PID to occasionally spike high due to the test pulse sent to the pressure sensor by the ABS module.
  
  NOTE: Negative brake pressure is considered normal due to the signal is not calibrated.
- With the brake pedal not applied, record the pressure displayed by the BRAKPRES PID.
- Is the initial brake pressure greater than -1551 kPa (-225) with the brake pedal not applied?
- Yes : The condition is not present at this time. CLEAR the DTCs. CYCLE the ignition key. REPEAT the self-test.
- No : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . REPEAT the self-test.