C1243

DTC C1242 or C1243





Circuit Description
The pump motor is grounded through the ground stud on the BPMV. The EBCM controls the pump motor by energizing the pump motor relay. The pump motor relay then supplies voltage to the pump motor. The pump serves 2 purposes:
^ Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events
^ Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events.

Conditions for Running the DTC
C1242
The pump motor is commanded OFF.

C1243
The pump motor is ON for at least 0.15 seconds.

Conditions for Sewing the DTC
C1242
One of the following conditions exists:
^ The voltage across the pump motor is between 3.3 - 5.2 volts for 2 seconds.
^ The pump motor ground resistance is greater than 6900 ohms.

C1243
The pump motor is stalled or turning slowly.

Action Taken When the DTC Sets
If equipped, the following actions occur:
^ The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle.
^ The ABS indicator turns ON.
^ The Traction Control indicator turns ON.
^ The DIC displays the Service Stability System message.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
^ The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.

Diagnostic Aids
The pump motor is integral to the BPMV. The pump motor is not serviceable.

Test Description
The numbers below refer to step numbers on the diagnostic table.
2. Tests the pump motor ground.
4. Tests the pump motor ground through the BPMV.