• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Wheel Speed Sensor Frequency Error | -- | -- | -- | C0245 00, 5A |
The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.
• | The ignition is ON. |
• | Ignition voltage is greater than 9.5 volts. |
• | No wheel speed sensor faults exist. |
• | Brake is not applied. |
• | Vehicle is not cornering. |
• | No wheel spinning is detected. |
Wheel speed differences between one wheel and the others is greater than 25 percent.
• | Antilock Brake System (ABS), Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) are disabled for the remainder of the ignition cycle. |
• | The ABS and Stabilitrak indicator turns ON. |
• | The service Traction Control and Stabilitrak displays on the DIC. |
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 100 malfunction-free ignition cycles. |
• | The EBCM receives a clear code command from the scan tool. |
• | Faulty wheel speed sensor will not set this DTC. |
• | A vehicle using a space saver spare will not set this code. |
Antilock Brake System Schematics
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for Scan Tool Information
Inspect for one tire that has improper air pressure or improper size.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.