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 to continue diagnosis of the HS-CAN .
- No : REFER to EXTERIOR LIGHTING to continue diagnosis of the stoplamp switch and stoplamps.
J3 MONITOR THE ABS MODULE BRAKE PRESSURE (BRAKPRESS) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS.
- Firmly press and release the brake pedal while monitoring the BRAKPRES PID.
- Does the PID increase with firm pressure on the brake pedal and then decrease with the brake pedal released?
- Yes : GO to J4.
- No : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . GO to J5.
J4 ISOLATE THE HCU
- Test drive the vehicle, firmly press and release the brake pedal while an assistant monitors the BRAKPRES PID.
- Does the PID increase with firm pressure on the brake pedal and then decrease with the brake pedal released?
- 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) . GO to J5.
J5 ISOLATE THE ABS MODULE
- Firmly press and release the brake pedal while monitoring the BRAKPRES PID.
- Does the PID increase with firm pressure on the brake pedal and then decrease with the brake pedal released?
- Yes : The system is operating correctly at this time.
- No : INSTALL a new ABS module, REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . CLEAR the DTCs. REPEAT the self-test with the brake pedal not applied.