C0235

Circuit Description
The EBCM receives the rear wheel speed signal from the VCM (4.3L only) or the PCM. The signal from the VCM/PCM is always high (12 volts) when the ignition is ON and the vehicle is not moving.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
The voltage on the vehicle speed signal circuit is detected as being low for more than 500 milliseconds.

Action Taken When the DTC Sets
^ The ABS, BRAKE and TRACTION OFF (if equipped with traction control) indicators are commanded on.
^ The ABS, DRP and Traction Control (if equipped) are disabled for as long as the malfunction is present.

Conditions for Clearing the DTC
^ The condition(s) responsible for setting the DTC are no longer present.
^ A scan tool is used in order to clear the DTC.

Important: After the DTC is cleared and the ignition is ON, the ABS indicator may remain on until the EBCM completes a power-up self-test. This test concludes when the vehicle reaches a speed of greater than 13 km/h (8 mph) and the wheel speeds are verified by the EBCM.

Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent and Poor Connections, Wiring Repairs and Connector Repairs under Diagrams, Diagnostic Aids.

Test Description
The number below refers to the step number on the diagnostic table.
3. This step tests if the VCM/PCM is sending a 12 VDC signal to the EBCM.