Diagnostic Instructions
DTC Descriptor
DTC C0245 00: Wheel Speed Sensor Frequency Error
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Wheel Speed Sensor Frequency Circuit
| --
| --
| --
| C0245 00
|
Circuit/System Description
As the wheel spins, the wheel speed sensor produces an AC signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
Conditions for Running the DTC
| • | Ignition voltage is greater than 9 volts. |
| • | Vehicle must be moving at a speed less than 14.5 km/h (9 mph). |
| • | No wheel speed sensor faults exist. |
| • | Vehicle is not cornering. |
| • | No wheel spinning is detected. |
Conditions for Setting the DTC
| • | Wheel speed differences between one wheel and the others is greater than 25 percent. |
| • | This DTC will set when the EBCM cannot specifically identify which wheel speed sensor (WSS) is causing the malfunction. If the EBCM can identify the specific WSS causing the malfunction, DTC C0245 will become a history DTC, and the DTC associated
with the sensor DTC C0036,C0041, C0046, C0051, or DTC C0056 will be set concurrent with DTC C0245. |
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | Antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) are inhibited. |
| • | The ABS indicator illuminates. |
| • | The Stability OFF indicator illuminates. |
| • | The red BRAKE warning indicator illuminates. |
Conditions for Clearing the MIL/DTC
The condition for the DTC is no longer present
Diagnostic Aids
| • | Faulty wheel speed sensor will not set this DTC. |
| • | A vehicle using a space saver spare will not set this code. |
| • | If the customers comments reflect that the amber ABS/TCS indicator is on only during moist environmental conditions (rain, snow, vehicle wash), inspect all the wheel speed sensor circuitry for signs of water intrusions. If the DTC is not current,
clear all DTCs and simulate the effects of water intrusion by using the following procedure: |
| 1. | Spray the suspected area with a five percent saltwater solution. Add 2 teaspoons of salt to 12 ounces of water to make five percent saltwater solution. |
| 2. | Test drive the vehicle over various road surfaces (bumps, turns, etc.) above 40 km/h (25 mph) for at least 30 seconds. |
| 3. | If the DTC returns, replace the suspected harness. |
If an intermittent malfunction exists refer to
Testing for Intermittent Conditions and Poor Connections
.
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
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.
