C0045

DTC C0045 Left Front Isolation Solenoid Circuit Open:

Isolation Solenoid Circuit Schematic:

CIRCUIT DESCRIPTION
When the LF isolation solenoid is needed (see Antilock Brake System, Description and Operation) the Electronic Brake Control Module (EBCM) will ground the solenoid circuit to energize the coil within the solenoid. This will close the isolation valve by the magnetic force created by the solenoid coil.

CONDITIONS FOR SETTING THE DTC
^ ABS bulb check complete
^ Low voltage on EBCM solenoid driver circuit when expected to be high (solenoid not energized)

ACTION TAKEN WHEN THE Diagnostic Trouble Codes (DTC) SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: DTC C0045 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).

DIAGNOSTIC AIDS
DTC C0045 is usually set by an open solenoid coil within the EBCM. The LF isolation solenoid is located within the Brake Pressure Modular Valve (BPMV) and is not serviceable. If the test does not repair the DTC, the EBCM must be replaced. If DTC C0045 is set with other DTCs, check for a poor EBCM ground or poor EBCM power feed.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic chart.
2. Inspect EBCM 2-way harness connector for damage.
3. Check EBCM power and ground circuits.