Wheel Speed Sensor: Testing and Inspection

Wheel Sensor Inspection
1. Clean the encoder, and make sure no metal is stuck to the encoder surface.
2. Check the magnetic encoder (A) for damage. If cracked or damaged, replace the encoder.





Front





Rear

3. Measure the air gap between the wheel sensor (B) and the magnetic encoder all the way around while rotating the encoder.
Standard:
Front: 0.5 - 1.2 mm (0.02 - 0.05 inch)
Rear: 0.4 - 1.1 mm (0.02 - 0.04 inch)