C0237

C0237 or C037

Circuit Description
The EBCM receives the rear wheel speed signal from the VCM/PCM. When the vehicle is moving, the EBCM compares the rear wheel speed signal to both of the front wheel speed sensor signals.

Conditions for Running the DTC
^ The ignition is ON.
^ All of the wheel speed sensor signals are above 32 km/h (20 mph) when the brake is applied or 19 km/h (12 mph) when the brake is released.

Conditions for Setting the DTC
Either of the following conditions will set Diagnostic Trouble Code (DTC) C0237:
^ A sudden loss of the rear wheel speed signal is detected for 15 milliseconds.
^ A sudden increase is detected in the rear wheel speed signals at a rate greater than 8.8 km/h (5.5 mph) for 105 milliseconds.

Action Taken When the DTC Sets
^ The ABS and BRAKE indicators are commanded on.
^ The ABS is disabled for as long as the malfunction is present. If the malfunction occurs 3 or more separate times, the ABS is disabled for the remainder of the ignition cycle.

Conditions for Clearing the DTC
^ Repair the condition(s) responsible for setting the DTC.
^ Use a scan tool in order to clear the DTC.

Diagnostic Aids
operating the vehicle on extremely rough terrain can set DTC C0237 even if the system is not malfunctioning. Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Inspect for the following:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Corrosion
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physically damaged wiring
^ Wiring broken inside the insulation

Test Description


The number below refers to the step number on the diagnostic table:
4. This step tests for an erratic rear wheel speed signal from the VCM/PCM.