Grand Voyager V6-3.3L VIN G Flex Fuel (1999)
Wheel Speed Sensor: Description and Operation
Front Wheel Speed Sensor
Rear Wheel Speed Sensor (FWD)
One Wheel Speed Sensor (WSS) and one tone wheel are located at each front and rear wheel. Each front wheel speed sensor is attached to a boss in
the steering knuckle. The front tone wheel is part of the outboard constant velocity joint. The rear wheel speed sensor on rear disc brake applications is
mounted to the rear disc brake adapter. The rear tone wheel is an integral part of the rear wheel hub and bearing.
The wheel speed sensor sends a small AC signal to the CAB. This signal is generated by magnetic induction created when a toothed sensor ring (tone
wheel) passes the stationary magnetic wheel speed sensor. The CAB converts the AC signal into a digital signal. If a wheel locking tendency is
detected by the CAB, it will then modulate hydraulic pressure via the HCU to prevent the wheel(s) from locking.
Correct ABS operation is dependent on accurate wheel speed signals. The vehicle's tires and wheels all must be the same size and type to generate
accurate signals. Variations in tire and wheel size can produce inaccurate wheel speed signals.
Improper speed sensor-to-tone wheel clearance can cause erratic speed sensor signals. The speed sensor air gap is not adjustable, but should be
checked when applicable. Wheel speed sensor-to-tone wheel clearance specifications can be found in Specifications.
