F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Wheel Speed Sensor: Description and Operation
Toothed Ring
The rear anti-lock brake system (RABS) sensor is a coil mounted on the rear axle housing. The RABS sensor ring is mounted on the ring gear in the
differential and rotates close to the RABS sensor. As it rotates, the RABS sensor ring magnetically induces an AC voltage into the RABS sensor. The AC
voltage is proportional to the rear wheel speed and is used by the anti-lock electronic control module to determine the rate of deceleration of the rear
wheels.
