C1225

CIRCUIT DESCRIPTION
The wheel speed sensor used on this vehicle is a single point magnetic pickup. This sensor produces an AC signal that the EBTCM uses the frequency from to calculate the wheel speed.

CONDITIONS FOR SETTING THE DTC
The DTC sets if all of the following occur:
^ The brake pedal is not depressed.
^ No wheel speed sensor hardware DTCs are present.
^ The EBTCM sees a wheel speed variation of more than 14 Km/h (9 mph) for 2.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ The ABS/TCS/Stabilitrak is disabled.
^ The ABS indicator is turned ON.
^ The TRACTION CONTROL indicator is turned ON.
^ The DIC displays the SERVICE STABILITY SYS message.

CONDITIONS FOR CLEARING THE DTC
^ The condition for DTC is no longer present and you used scan tool Clear DTCs function.
^ The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
^ The EBTCM does not detect the DTC in 50 drive cycles.

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.
^ An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
^ If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. This step checks for the resistance of the wheel speed sensor.
5. This step checks for if the wheel speed sensor circuits are shorted together.