C1243

DTC C1242 or C1243





Circuit Description
The system relay is energized when the ignition is ON. The system relay supplies voltage to the solenoid valves and the pump motor. This voltage is referred to as the system voltage.
The EBCM controls each solenoid valve by grounding the solenoid.
The EBCM controls the pump motor by grounding the control circuit. 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 system voltage is greater than 8.0 volts.
^ The system relay is ON.
^ The pump motor is commanded OFF.

C1243
^ The pump motor is ON for at least 0.3 seconds.
^ The system relay is ON.

Conditions for Setting the DTC C1242
The voltage across the pump motor is between 1.7 - 10.2 volts for 2 seconds.

C1243
The pump motor is stalled or turning slowly.

Action Taken When the DTC Sets
^ The EBCM disables the ABS for the duration of the ignition cycle.
^ The ABS indicator turns ON.
^ The DRP does not function optimally.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

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

Test Description
The number below refers to the step number on the diagnostic table.
5. Tests the ability of the EBCM to control the pump motor. If the test lamp illuminates, the pump motor circuit within the EBCM is good.