C0265

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CIRCUIT DESCRIPTION (DTC C0065)
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 Electronic Brake Control Module (EBCM).

CONDITIONS FOR SETTING THE DTC (DTC C0065)
^ 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 (DTC C0066)
^ 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

Diagnostic Trouble Codes (DTCs) C0065 and C0065 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).

CONDITIONS FOR CLEARING THE DTC
^ Repair the conditions responsible for setting the DTC
^ Use the Scan Tool Clear DTCs function

DIAGNOSTIC AIDS (DTC C0065)
DTC C0065 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 C0065 appears with other DTCs repair the other DTCs first. Clear all DTCs. Then run three function tests with the Scan Tool. Refer to the diagnostic chart if DTC C0065 resets.

DIAGNOSTIC AIDS (DTC C0066)
DTC C0066 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:
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.