Sebring Sedan V6-2.7L VIN R (2004)
Wheel Speed Sensor: Description and Operation
SWITCHES / SENSORS
Wheel Speed Sensors and Tone Wheels: One active Wheel Speed Sensor (WSS) is located at each wheel. The sensors use an electronic principle
known as magneto-resistive to help increase performance, durability and low speed accuracy. The sensors convert wheel speed into a small digital
sound. A toothed gear tone wheel serves as the trigger mechanism for each sensor.
The CAB sends 12 volts to power an Integrated Circuit (ICC) in the sensor. The IC supplies a constant 7 mA signal to the CAB. The relationship of
the tooth on the tone wheel to the permanent magnet in the sensor, signals the IC of the sensor to toggle a second 7 mA power supply on or off. The
output of the sensor, sent to the CAB, is a DC voltage signal with changing voltage and current levels. The CAB monitors the changing amperage
(digital signal) from each wheel speed sensor. The resulting signal is interpreted by the CAB as the wheel speed.
Because of internal circuitry, correct wheel speed sensor function cannot be determined by a continuity or resistance check through the
sensor.
Correct antilock system operation is dependent on accurate wheel speed signals from the wheel speed sensors. The vehicle's wheels and tires should all
be the same size and type to generate accurate signals. In addition, the tires should be inflated to the recommended pressures for optimum system
operation. Variation in wheel and tires size or significant variations in inflation pressure can produce inaccurate wheel speed signals; however, the
system will continue to function when using the correct factory mini-spare.
