C1272

Diagnostic Chart - Part 1 Of 2:

Diagnostic Chart - Part 2 Of 2:

Schematic Diagram:

CIRCUIT DESCRIPTION
The Electronic Brake (and Traction) Control Module Electronic Brake/Traction Control Module (EBCM/EBTCM) monitors brake pedal position using the brake travel switch. The switch is normally closed. It opens when the brake pedal is depressed approximately 40% down. During most ABS braking conditions the EBCM/EBTCM turns ON the pump motor, replenishing the Brake Pressure Modulator Valve (BPMV) reservoir and applying fluid pressure to the master cylinder. This causes the brake pedal to gradually rise. The EBCM /EBTCM turns OFF the pump motor when brake pedal height sufficiently rises to close the brake travel switch.

CONDITIONS FOR SETTING THE DTC
DTC C1272 sets when the EBCM/EBTCM detects the brake travel switch CKT 848 is shorted to ground (with the brake pedal depressed) or open.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS is disabled and the ANTILOCK indicator lamp is turned ON.

CONDITIONS FOR CLEARING THE DTC
^ Conditions for the malfunction are no longer present and scan tool clear DTCs function is used.

^ 100 ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
Possible Causes:
- TCC/Antilock Switch circuit open or shorted to ground.
- BPMV Fluid Level Switch circuit shorted to ground.
- ABS Pump Motor Pressure Switch circuit shorted to ground.

It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully inspect wiring may result in misdiagnosis, causing part replacement with reappearance of the malfunction.