C0265
DTC C0265 or C0266 EBCM Relay CircuitCircuit Description (DTC C0265)
The pump motor relay supplies power to all six solenoid coils (three isolation solenoid coils and three dump solenoid coils) and the motor when the ABS is required. The relay and the six solenoid coils are located within the EBCM.
Conditions for Setting the DTC (C0265)
- The EBCM microprocessor commands the relay on
- Low voltage exists on all six solenoid driver circuits when high voltage is expected (the solenoid is not energized)
Conditions for Setting the DTC (C0266)
- The ABS bulb check is complete
- High voltage exists on the pump motor driver 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 C0265 is DRP Critical and C0266 is DRP 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-closeable 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 table 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
Steps 1 - 6:
Steps 7 - 11:
Steps 12 - 19:
The numbers below refer to the steps in the diagnostic table:
3. This step determines the resistance of the power ground circuit.
4. This step determines the battery voltage available to the EBCM.
7. This step determines the resistance of the signal ground circuit.
8. This step determines the ignition voltage available to the EBCM.