DTC 63

DTC 63

Step 1-10:

Circuit Description
The valve relay is part of the Electronic Brake Control Module (EBCM). The EBCM turns ON the valve relay when the ignition switch is in the ON position and no malfunction exists in the ABS. The valve relay provides power to the Antilock Brake System (ABS) solenoid valves.

Conditions for Running the DTC
DTC 63 can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC
The EBCM detects one of the following:
- valve relay voltage is low.
- valve relay voltage is 12 V when the EBCM is not requesting it to be.
- an open or short in the valve solenoid circuitry.

Action Taken When the DTC Sets
- The ABS and traction control system are disabled.
- The ABS and TRAC OFF 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, high resistance or short to ground in the EBCM battery positive voltage circuit
- An open, high resistance or short to ground in the EBCM ignition positive voltage circuit
- An open or high resistance in the EBCM ground circuits
- An internal EBCM malfunction

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

Test Description
The numbers in the image refer to step numbers on the diagnostic table.
5. This step tests the EBCM ground circuits.
6. This step tests the EBCM battery positive voltage circuits.
7. This step tests the EBCM ignition positive voltage circuit.