Pinpoint Test M: Front Wheel Speed Sensor Electrical Faults
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
Active wheel speed sensors generate a voltage 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. The 2 circuits provide both sensor power and sensor signal return. When the ignition mode 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 Condition |
|---|---|---|
| ABS C0031:01 | Left Front Wheel Speed Sensor: General Electrical Failure | Sets when the wheel speed signal continuously exceeds a specified threshold or is operating outside of the allowable range |
| ABS C0034:01 | Right Front Wheel Speed Sensor: General Electrical Failure | Sets when the wheel speed signal continuously exceeds a specified threshold or is operating outside of the allowable range |
Possible Sources
- Wiring, terminals or connectors
- Wheel speed sensor
- EBB unit (vehicles with electric boost)
- ABS module (vehicles with vacuum boost)
Visual Inspection and 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.
PINPOINT TESTS M: FRONT WHEEL SPEED SENSOR ELECTRICAL FAULTS