DTC 45

DTC 45 Power Interruption Fault (part 1 Of 2):

DTC 45 Power Interruption Fault (part 2 Of 2):

Power Interuption Fault:

CIRCUIT OPERATION
When the ignition is first turned to "RUN," the EBCM/EBTCM goes through a self-check lasting 2-4 seconds. During this test the EBCM/EBTCM grounds terminal 34, energizing the main relay. Once the self-check is completed the main relay remains energized. This delivers battery voltage to both the EBCM/EBTCM and the pressure modulator valve (PMV) assembly during vehicle operation. The constant voltage supply allows the vehicle to enter ABS mode without delay. The main relay is de-energized whenever the amber "ANTILOCK" indicator lights due to a system fault, causing the ABS system to shut down.

FAILURE CONDITION
DTC 45 sets when the ignition switch is at "RUN" and battery voltage is neither detected at the PMV assembly nor EBCM/EBTCM terminal 20, 3, and/or 33. Code 45 also sets when the EBCM/EBTCM detects an open or a short to ground in the LH inlet valve circuit.

Possible Causes
^ Open in CKT 641, 1632, 858, 1633, or 342.
^ Short to ground in CKT 858, 1633, or 342.
^ Main relay fails "open."

DIAGNOSTIC AIDS
DTC 45 may also set when the vehicle is hot (running for a minimum of 30 minutes) check PMV valve resistance and main relay coil resistance when vehicle is hot.