C0156

DTC C0060-C0095, C0151, or C0156





Circuit Description
The electronic brake control module (EBCM) energizes the solenoid valve relay when the ignition switch is ON. The solenoid valve relay applies voltage to the solenoid valve coils. The solenoid valve relay remains energized until the ignition switch is turned OFF, or the ABS/TCS is disabled. The EBCM controls the operation of each solenoid valve by applying ground to the solenoid valve coil control circuit to modulate the brake fluid pressure of each wheel circuit. The EBCM monitors the solenoid valve relay and the solenoid valves for proper operation.

DTC Descriptors
This diagnostic procedure supports the following DTCs:
^ DTC C0060 LF Outlet Valve Solenoid
^ DTC C0065 LF Inlet Valve Solenoid
^ DTC C0070 RF Outlet Valve Solenoid
^ DTC C0075 RF Inlet Valve Solenoid
^ DTC C0080 LR Outlet Valve Solenoid
^ DTC C0085 LR Inlet Valve Solenoid
^ DTC C0090 RR Outlet Valve Solenoid
^ DTC C0095 RR Inlet Valve Solenoid
^ DTC C0151 Rear TCS Prime Solenoid Fault
^ DTC C0156 Rear TCS Isolation Solenoid Fault

Conditions for Running the DTC
DTCs can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC
The EBCM detects one of the following conditions:
^ Short to voltage, open circuit or invalid signal fault condition in inlet and outlet solenoid valves.
^ Short to voltage, open circuit or invalid signal fault condition in isolating solenoid valve.
^ Short to voltage, open circuit or invalid signal fault condition in priming solenoid valve.

Action Taken When the DTC Sets
^ The ABS and traction control system are disabled.
^ The ABS, TRAC OFF and BRAKE warning indicators turn ON.

Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
^ An open, or high resistance in the EBCM ground circuit
^ An open, high resistance or short to ground in the EBCM battery supply voltage circuits
^ An internal EBCM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
5. This step tests the EBCM ground circuit for an open, or high resistance.
6. This step tests the battery supply voltage circuits of the EBCM for an open, high resistance or short to ground.