Pinpoint Test M : Wheel Speed Sensor Electrical Faults - Front: Notes
Refer to Vehicle Dynamic Systems for schematic and connector information.
Normal Operation and Fault Conditions
Active wheel speed sensors generate a square wave signal proportional to wheel speed which is sent to the ABS module. Each wheel speed sensor is connected to the ABS module through 2 wires and a connector at each wheel speed sensor. One wire is for sensor voltage supply from the ABS module and the other wire is for the signal return to the ABS module. When the ignition is set to ON, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0031:11 | Left Front Wheel Speed Sensor: Circuit Short to Ground | These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is a short to ground in the sensor signal return circuit or if the sensor has an internal short to ground. |
| C0034:11 | Right Front Wheel Speed Sensor: Circuit Short to Ground | |
| C0031:15 | Left Front Wheel Speed Sensor: Circuit Short to Battery or Open | These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is a short to battery voltage or an open in the sensor signal return circuit. A short to battery voltage may be due to the sensor signal return circuit and the sensor voltage supply circuit shorted together. These Diagnostic Trouble Codes (DTCs) also set if the sensor has an internal short to battery voltage or an open circuit. |
| C0034:15 | Right Front Wheel Speed Sensor: Circuit Short to Battery or Open |
Possible Causes
- Wiring, terminals or connectors
- Wheel speed sensor
- ABS module
Visual Inspection and Diagnostic Pre-checks
- Make sure the wheel speed sensor harness is routed correctly and is undamaged.
- Make sure the wheel speed sensor electrical connector is free from any corrosion or other contaminants.