Pinpoint Test I : 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.
The front wheel speed sensors and encoder rings are part of the front wheel hub and bearing assembly.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0031:01 C0034:01 |
Left Front Wheel Speed Sensor: General Electrical Failure Right Front Wheel Speed Sensor: General Electrical Failure |
These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if one or more wheel speed sensors are not sending a signal to the ABS module. |
| C0031:12 C0034:12 |
Left Front Wheel Speed Sensor: Circuit Short to Battery Right Front Wheel Speed Sensor: Circuit Short to Battery |
These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is a short to battery voltage 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. |
| C0032:11 C0035:11 |
Left Front Wheel Speed Sensor Supply: Circuit Short to Ground Right Front Wheel Speed Sensor Supply: Circuit Short to Ground |
These Diagnostic Trouble Codes (DTCs) set in continuous memory if there is a short to ground in the sensor signal voltage supply circuit. |
| C0031:14 C0034:14 |
Left Front Wheel Speed Sensor: Circuit Short to Ground or Open Right Front Wheel Speed Sensor: Circuit Short to Ground or Open |
These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is a short to ground or an open in the sensor signal return circuit or if the sensor has an internal short to ground or an internal 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.