C0066

Electronic Brake Control Module (EBCM) Power And Ground:

DTC C0066 - Pump Motor Relay Circuit Shorted:

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

CONDITIONS FOR SETTING THE DIAGNOSTIC TROUBLE CODE (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: This DTC is an Ignition Latched DTC, which indicates that the above is true until the ignition switch is turned to Off position (even if the cause of the DTC is intermittent).

DIAGNOSTIC AIDS
^ DTC C0066 is usually set by the relay contacts sticking 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.
^ If DTC C0066 appears with other DTCs, first repair and clear the other DTCs, then run three function tests with the scan tool. If DTC C0066 resets, refer to the diagnostic chart.

TEST DESCRIPTION

NOTE: Number(s) below refer to number(s) on the diagnostic chart.

2. Inspect the EBCM 2-way harness connector for damage.
3. Check the ground circuits to the EBCM.
4. Check the power circuits to the EBCM.