For 1990-2009 cars

### Diagnostic Instructions

• | 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.

### DTC Descriptor

DTC C0245 : Wheel Speed Sensor Frequency Error

### Circuit/System Description

The wheel speed sensor receives a 12-volt reference voltage from the electronic brake control module (EBCM). As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal via the wheel speed sensor output circuit. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

### Conditions for Running the DTC

• | Ignition voltage is greater than 10 volts.

• | Vehicle must be moving at a speed greater than 30 km/h.

### Conditions for Setting the DTC

• | Wheel speed differences between one wheel and the others is greater than 20 percent.

• | The fault must be present for greater than 60 seconds.

### Action Taken When the DTC Sets

• | The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.

• | A DIC message and/or a warning indicator may be displayed.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The EBCM clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.

### Diagnostic Aids

• | Faulty wheel speed sensor will not set this DTC.

• | A vehicle using a space saver spare will not set this code.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Inspect for one tire that has improper air pressure or improper size.