Concorde V6-2.7L VIN V (2001)
Wheel Speed Sensor: Description and Operation
Rear
DESCRIPTION
One Wheel speed sensor (WSS) and one tone wheel are located at each front and rear wheel. 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.
OPERATION
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 (air gap) can cause erratic speed sensor signals. The speed sensor air gap is not adjustable, but should
be checked when applicable. Wheel speed sensor air gap specifications can be found in SPECIFICATIONS.
