Wheel Speed Sensor: Service and Repair

ANTI-LOCK BRAKING SYSTEM WHEEL SPEED SENSOR





COMPONENTS

DESCRIPTION





A toothed rotor is fixed to the rotating member of the wheel, and the sensor is fixed to the static member of the suspension. As the wheel rotates the toothed rotor causes magnetic flux changes in the magnetic field of the permanent magnet. The sensor element senses these changes.

Depending on the flux changes the sensor sends a signal out to the ECU. The change in magnet flux thus the sensor signal is directly related to the wheel speed. The controller monitors the sensor signal, compares the four wheel-speed signals and initiates action as required.





SPECIFICATIONS

REMOVAL

FRONT WHEEL SPEED SENSOR





1. Remove the front wheel speed sensor mounting bolt.





2. Remove the front wheel speed sensor after disconnecting the wheel speed sensor connector.

REAR WHEEL SPEED SENSOR





1. Remove the rear wheel speed sensor mounting bolt.





2. Remove the luggage trim and disconnect the wire connector from the rear wheel speed sensor.

INSPECTION





1. Measure the output voltage between the terminal of the wheel speed sensor and the body ground.

CAUTION: In order to protect the wheel speed sensor, when measuring output voltage, a 100Q resister must be used as shown.





2. Compare the change of the output voltage of the wheel speed sensor to the normal change of the output voltage as shown below.
^ V-Low 590 mV - 840 mV
^ V-high 1.18V - 1.68V
Frequency range: 1 - 2,00OHz