C1243

Circuit Description
The EBCM relay supplies power to the solenoid valves and pump motor. The EBCM relay activates when the ignition is turned to the ON position. Power is available to the solenoid valves and pump motor through the relay via the battery positive voltage circuit. The EBCM relay remains engaged until the ignition switch is turned to the OFF position or until the EBCM detects a malfunction which requires the system to be disabled.

Conditions for Running the DTC
^ The pump motor is ON for at least 0.3 seconds.
^ The EBCM relay is ON.

Conditions for Setting the DTC
The pump motor is stalled or turning slowly.

Action Taken When the DTC Sets
The following actions occur:
^ The EBCM disables the ABS for the duration of the ignition cycle.
^ The ABS warning indicator turns ON.
^ A malfunction DTC is stored.

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

Diagnostic Aids
^ Possible causes for DTC C1243 to set are: - The pump motor has high resistance.
- The pump motor is turning too slowly.
- An internal EBCM malfunction exists.
^ The pump motor is an integral part of the BPMV and is not serviced separately.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This test verifies the operation of the pump motor.
3. This step tests the pump motor circuits of the BPMV for an open.
4. This step tests the pump motor and pump motor circuits by supplying power and ground.