C1242

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 switched battery voltage is greater than 8.0 volts.
^ The EBCM relay is ON.
^ The pump motor is commanded OFF.

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

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 C1242 to set are:
- Pump motor open.
- 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 step uses the scan tool to test if the pump motor can be commanded ON and OFF.
3. This step verifies the resistance of the pump motor.
4. This step determines whether the DTC resets.