Wheel Speed Sensor: Description and Operation

RWAL Speed Sensor:

Rear Wheel Anti-Lock Brake System:

PURPOSE
The speed sensor is used to transmit speed and rate of deceleration information to the control module by means of a small AC voltage.

OPERATION
This voltage is generated by magnetic induction by passing a toothed sensor ring (exciter ring) past a stationary magnetic sensor.
- The toothed exciter ring is pressed onto the differential case.
- The sensor is mounted at the top of the rear axle housing directly over the gear-type exciter ring.