C1235

Circuit Description
As a toothed ring passes by the wheel speed sensor, changes in the electromagnetic field cause the wheel speed sensor to produce an AC voltage signal. The EBCM uses the frequency of the AC signal to calculate the wheel speed.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC
A malfunction exists if either of the wheel speed sensor circuits or the wheel speed sensor are open or shorted to voltage or ground.

Action Taken When the DTC Sets
^ The EBCM stores a malfunction DTC.
^ The EBCM disables the ABS and ETS.
^ The ABS warning indicator turns ON.
^ The TRAC OFF indicator turns 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 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition OFF.

Diagnostic Aids
^ Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
^ Poor connections, broken insulation, or a break in the wire inside the insulation may cause an intermittent malfunction.
^ If an intermittent malfunction exists, refer to Testing for Intermittent and Poor Connections.

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 proper resistance value.








DTC C1235 RR Wheel Speed Circuit Open or Shorted