Wheel Speed Sensor: Description and Operation

OPERATION
One wheel speed sensor (WSS) is located at each wheel and sends an AC signal to the Controller, Antilock Brake (CAB). The voltage is generated by magnetic induction when a tooth sensor ring passes by a stationary magnetic sensor. The CAB then converts the AC signal into digital signals for each wheel. The four wheel speed sensors are serviced individually. The front tone wheels are serviced as an assembly with the outer CV joint housing. The rear tone wheels are serviced as an assembly with the rotor hub.

CIRCUIT OPERATION
There are four wheel-speed sensors one at each wheel. The sensors use a tone wheel to determine wheel speed. Input to the Controller Anti-Lock Brake (CAB is done on the following circuits, each of which is a twisted pair: B8 and B9 for the left front wheel (cavity 30 and cavity 15) B6 and B7 for the right front wheel (cavity 6 and cavity 1) B3 and B4 for the left rear wheel (cavity 19 and cavity 28) B1 and B2 for the right rear wheel (cavity 31 and cavity 29)