C0265

Circuit Description
The EBCM internal relay supplies power to all six solenoid coils (three isolation solenoid coils and three dump solenoid coils) and the pump motor. The relay and the six solenoid coils are located within the EBCM.

Conditions for Running the DTC
^ Ignition switch in the RUN position.
^ The EBCM internal relay is commanded ON.

Conditions for Setting the DTC (C0265)
Low voltage exists on all six solenoid driver feedback circuits when high voltage is expected (the relay is not energized)

Conditions for Setting the DTC (C0266)
High voltage exists on the pump motor driver feedback circuit when all are expected to be low (the relay is not commanded on)

Action Taken When the DTC Sets
^ The ABS indicator lamp turns on
^ The ABS disables
DTCs C0265 and C0266 are Ignition Latched DTCs which indicates that the above actions remain true until the ignition is turned to OFF (even if the cause of the DTC is intermittent).
DTC C0265is DRP critical and C0266 is non-critical. DRP is only disabled and the BRAKE indicator lamp will only light when DTC C0265is set.

Conditions for Clearing the DTC
^ Repair the conditions responsible for setting the DTC
^ Use the Scan Tool Clear DTCs function

Diagnostic Aids (DTC C0265)
DTC C0265 usually sets because of an open relay coil or non-closable relay contacts. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.
If DTC C0265 appears with other DTCs repair the other DTCs first. Clear all DTCs. Then run three function tests with the Scan Tool. Refer to this diagnostic chart if DTC C0265 resets.

Diagnostic Aids (DTC C0266)
DTC C0266 usually sets when the relay contacts are stuck closed. The relay is located within the EBCM. The relay is not serviceable. If the test does not repair the DTC, then replace the EBCM.

Test Description
The numbers below refer to the steps in the diagnostic table:
2. This step determines the battery voltage available to the EBCM.
3. This step verifies that the motor and solenoid power circuit is OK.
4. This step determines if the ignition 3 power and signal ground circuits are OK, then attempts to determine if the DTC will set again during a road test.