C1235

Circuit Description
The speed sensor used on this vehicle is a multiple pole magnetic pickup. This sensor produces an AC signal that the EBCM uses the frequency from to calculate the wheel speed.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
Either of the following conditions are present for greater than 0.02 seconds.
^ Either wheel speed sensor circuit is open or shorted.
^ The wheel speed sensor is open.

Action Taken When the DTC Sets
^ The ABS/ETS/TCS disables.
^ The ABS/ETS/TCS indicator(s) 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.
^ 100 ignition cycles pass with no DTC(s) detected.

Diagnostic Aids
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
- Backed out terminals
- Improper mating
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness

^ The following conditions may cause an intermittent malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation

^ If the customer's comments reflect that the ABS/ETS/TCS indicator is on only during moist environmental conditions (rain, snow, vehicle wash), inspect all the wheel speed sensor circuitry for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
1. Spray the suspected area with a five percent saltwater solution. (Add two teaspoons of salt to twelve ounces of water to make a five percent saltwater solution.)
2. Test drive the vehicle over various road surfaces (bumps, turns, etc.) above 40 km/h (25 mph) for at least 30 seconds.
3. If the DTC returns, replace the suspected WSS or WSS harness.
4. Rinse the area thoroughly when completed.
^ If an intermittent malfunction exists refer to Testing for Intermittent and Poor Connections for further diagnosis.

Rear Wheel Speed Sensor Resistance





The following table contains resistance values for the front wheel speed sensors at varying sensor temperatures for use in diagnosis. The values are approximate and can be used as a guideline for diagnosis.

Test Description
The number below refers to the step number on the diagnostic table.
2. This step tests the wheel speed sensor and the wheel speed sensor signal circuits for an open.
3. This step tests the wheel speed sensor and the wheel speed sensor signal circuits for a short to ground.
4. This step tests the wheel speed sensor and the wheel speed sensor signal circuits for a short to voltage.
5. This step tests the wheel speed sensor for the