C0065

ABS/Pump Motor Relay Circuit Schematic:

CIRCUIT DESCRIPTION
The relay supplies power to all eight solenoid coils (4 isolation solenoid coils and 4 dump solenoid coils) when ABS is required. The relay and the eight solenoid coils are located within the Electronic Brake Control Module (EBCM).

CONDITIONS FOR SETTING THE DTC
^ EBCM microprocessor commands the relay on
^ Low voltage on all eight solenoid driver circuits when all are expected to be high (solenoid not energized).

ACTION TAKEN WHEN THE DTC
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: Diagnostic Trouble Code (DTC) C0065 is an ignition latched DTC which indicates the above is true until the ignition is turned to "OFF" (even if the cause of the DTC is intermittent).

CONDITIONS FOR CLEARING THE DTC
^ Conditions for setting the DTC are repaired and the Scan Tool clear (DTCs) function is used.

DIAGNOSTIC AIDS
DTC C0065 is usually set by an open relay coil or faulty relay contacts. The relay is located within the EBCM and is not serviceable. If the test does not repair the DTC, the EBCM must be replaced.

DTC C0065 Pump Motor Relay Circuit Open:

TEST DESCRIPTION
The numbers below refer to the step numbers on the chart.
[3] Checks the EBCM power ground circuit resistance.
[4] Checks EBCM power circuit voltage.