C1272

CIRCUIT DESCRIPTION
The EBCM/EBTCM monitors the brake pedal position using the brake travel switch. The switch, normally closed, opens when the brake pedal is pressed by 40%.

During most ABS braking conditions the EBCM/EBTCM turns ON the pump motor, replenishing the BPMV reservoir and applying fluid pressure to the master cylinder. This causes the brake pedal to rise gradually. The EBCM/EBTCM turns OFF the pump motor when the brake pedal height rises sufficiently to close the brake travel switch.

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

ACTION TAKEN WITH THE DTC SETS
The following actions are taken when the DTC sets:
^ DTC C1272 is stored
^ The ABS is disabled
^ The ANTILOCK indicator lamp is turned on

CONDITIONS FOR CLEARING THE DTC
The DTC will clear under following conditions:
^ Conditions for the malfunction are no longer present. Use the scan tool clear DTCs function.
^ 100 ignition switch key cycles have passed without detecting any malfunctions

DIAGNOSTIC AIDS
^ The following conditions may be other possible causes of this malfunction:
- The TCC/antilock switch circuit is open or shorted to ground
- The BPMV fluid level switch circuit is shorted to ground
- The ABS pump motor pressure switch circuit is shorted to ground
^ Perform a thorough inspection of the wiring and the connectors.
^ Failure to carefully inspect wiring may result in a misdiagnosis. A misdiagnosis may result in replacing parts without repairing the malfunction.

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Part 2 Of 2:

DTC C1272 BRAKE TRAVEL SWITCH CIRCUIT MALFUNCTION