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
The ignition switch is in the ON position and one of the follow occurs:
^ A short to battery malfunction occurs if the high and low inputs are greater than 4.25 volts for 0.02 seconds.
^ A short to ground malfunction occurs if the high and low inputs are less than 0.75 volts for 0.02 seconds.
^ An open occurs if the high input is greater than 4.25 volts and the low input is less than 0.75 volts for 0.02 seconds.

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/inch (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 see Diagnostic Aids under Diagrams.

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.