Pinpoint Test B : Wheel Speed Sensor Erratic Signal Faults: Notes
Normal Operation and Fault Conditions
The wheel speed sensor uses the encoder (tone wheel) on the wheel bearing to generate a square wave signal proportional to wheel speed that is sent to the ABS module. The wheel bearing, encoder and wheel speed sensor must be undamaged and free from any contamination to produce a clean signal for use by the ABS module. Also, all 4 tires and wheels must be of the same manufacturer recommended size for the wheel speed sensor to generate an accurate wheel speed signal.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| C0030:07 | Left Front Tone Wheel: Mechanical Failure | These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if there is damage to the wheel speed sensor encoder, damage to the wheel bearing, or contamination or deformation of the wheel bearing seal. |
| C0033:07 | Right Front Tone Wheel: Mechanical Failure | |
| C0036:07 | Left Rear Tone Wheel: Mechanical Failure | |
| C0039:07 | Right Rear Tone Wheel: Mechanical Failure | |
| C0031:07 | Left Front Wheel Speed Sensor: Mechanical Failure | These Diagnostic Trouble Codes (DTCs) set in continuous memory and on-demand if the wheel speed sensor, encoder or wheel bearing is damaged, or if the wheel bearing is not installed correctly. These Diagnostic Trouble Codes (DTCs) also set if an incorrectly sized tire is installed on the vehicle or if an excessive air gap exists between the wheel speed sensor and the encoder due to an incorrect component being installed. |
| C0034:07 | Right Front Wheel Speed Sensor: Mechanical Failure | |
| C0037:07 | Left Rear Wheel Speed Sensor: Mechanical Failure | |
| C003A:07 | Right Rear Wheel Speed Sensor: Mechanical Failure |
Possible Causes
- Under inflated tires
- Incorrect or mismatched tires
- Wheel bearings
- Wheel speed sensor encoders
- Wheel speed sensors
- Wiring, terminals or connectors
- ABS module