Pinpoint Test N: Rear Wheel Speed Sensor Electrical Faults: 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 RUN, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry.
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C0037:01 | Left Rear Wheel Speed Sensor: General Electrical Failure | Sets when the ABS module does not receive a signal from the wheel speed sensor. |
| ABS C003A:01 | Right Rear Wheel Speed Sensor: General Electrical Failure | Sets when the ABS module does not receive a signal from the wheel speed sensor. |
| ABS C1A95:01 | Wheel Speed Sensor: General Electrical Failure | Sets when the ABS module detects the following conditions on 1 or more wheel speed sensor circuits; open circuit, short to voltage, short to ground. Faults with multiple wheel speed sensors also causes this DTC to set. |
Possible Sources
- Wiring, terminals or connectors
- Wheel speed sensor
- ABS module
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.