C0042

ABS/RF Dump Solenoid Circuit Schematic:

CIRCUIT DESCRIPTION
When the RF dump solenoid is needed, the Electronic Brake Control Module (EBCM) will ground the solenoid circuit to energize the coil within the solenoid. This will open the dump 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 DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: Diagnostic Trouble Code (DTC) C0042 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 C0042 is usually set by an open solenoid coil within the EBCM. The RF dump solenoid is located within the BPMV and is not serviceable. If the test does not repair the DTC, the EBCM must be replaced. If DTC C0042 is set with other DTCs, check for a poor EBCM ground or poor EBCM power feed.

DTC C0042 RF Dump Solenoid 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.