C0066

ABS/Pump Motor Relay Circuit Schematic:

CIRCUIT DESCRIPTION
The relay supplies power to the pump motor when ABS is required. The relay is located within the Electronic Brake Control Module (EBCM).

CONDITIONS FOR SETTING THE DTC
^ ABS bulb check complete
^ High voltage on pump motor driver circuit when all are expected to be low (relay not commanded on).

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

NOTE: Diagnostic Trouble Code (DTC) C0066 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 C0066 is usually set by the relay contacts stuck closed. 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 C0066 Pump Motor Relay Circuit Shorted:

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.