Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

Wheel Speed Sensor Erratic Signal DTCs

Normal Operation and Fault Conditions

The wheel speed sensor utilizes the magnetic strip on the wheel bearing to generate a square wave signal proportional to wheel speed that is sent to the ABS (Anti-Lock Brake System) module. The wheel bearing, magnetic strip and wheel speed sensor must be undamaged and free from any contamination to produce a clean signal for use by the ABS (Anti-Lock Brake System) 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.

DTC (Diagnostic Trouble Code) Fault Trigger Conditions






Pinpoint Test

1. CHECK FOR ABS (Anti-Lock Brake System) MODULE DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

3. Retrieve and record all ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).

Is DTC (Diagnostic Trouble Code) C0031:07, C0034:07, C0037:07 and/or C003A:07 present?






2. CHECK THE TIRES SIZE AND PRESSURE

1. Ignition OFF.

2. Verify that all the tires and wheels are the same size and that the tire size and inflation pressures are correct as indicated on the VC (Vehicle Certification) label.

Are the tires and wheels OK?






3. CHECK THE WHEEL SPEED SENSOR FOR DAMAGE

1. With the vehicle in NEUTRAL, position it on a hoist. REFER to Lifting Points .

2. Disconnect the wheel speed sensor electrical connector.

3. NOTE: Examine the wheel speed sensor wire carefully with a good light source. Failure to verify damage in the wheel speed sensor wire can lead to unnecessary installation of a new component.
Inspect the wheel speed sensor and harness for abrasions, broken connector tabs or water intrusion.

Is the wheel speed sensor and harness OK?






4. INSPECT THE WHEEL SPEED SENSOR MOUNTING

1. Inspect the wheel speed sensor and fastener for looseness.

Are the wheel speed sensor and fastener tight?






5. CHECK WHEEL BEARING AND MAGNETIC STRIP FOR DAMAGE

1. Inspect the wheel bearings for abnormal wear or roughness and for deformation or contamination of the seal and magnetic strip.

Are the wheel bearing and magnetic strip OK?






6. CHECK FOR RETURNING DTCs (Diagnostic Trouble Codes)

1. Using a scan tool, clear all ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).

2. Test drive the vehicle under normal driving conditions above 20 km/h (12.4 mph).

3. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

Are any DTCs (Diagnostic Trouble Codes) present?