C0236

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. When the vehicle is moving, the VCM/PCM toggles this voltage on and off. The EBCM uses the frequency of this signal to calculate the rear wheel speed.

Conditions for Running the DTC
^ The ignition is ON.
^ The front wheel speed sensor signals are both greater than 13 km/h (8 mph).

Conditions for Setting the DTC
The rear wheel speed sensor signal is less than 6 km/h (4 mph) for 5 seconds.

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 vehicle speed signal to the EBCM. The voltage should measure approximately 50% of battery voltage while the driveshaft is rotating.