Wheel Speed Sensor: Testing and Inspection

DIAGNOSIS AND TESTING - REAR WHEEL SPEED SENSOR
Diagnosis of base brake conditions which are mechanical in nature should be performed first. This includes brake noise, lack of power assist, parking brake, or vehicle vibration during normal braking.
The Antilock brake system performs several self tests every time the ignition switch is turned on and the vehicle is driven. The CAB monitors the system inputs and outputs circuits to verify the system is operating properly. If the CAB senses a malfunction in the system it will set a DTC into memory and trigger the warning lamp.

NOTE: The MDS or ORB 111 scan tool is used to diagnose the Antilock Brake system.

REMOVAL
1. Raise vehicle on hoist.
2. Remove brake line mounting nut and remove the brake line from the sensor stud.





3. Remove mounting stud from the sensor and shield .
4. Remove sensor and shield from differential housing.
5. Disconnect sensor wire harness and remove sensor.

INSTALLATION
1. Connect harness to sensor. Be sure seal is securely in place between sensor and wiring connector.
2. Install O-ring on sensor (if removed).
3. Insert sensor in differential housing.
4. Install sensor shield.
5. Install the sensor mounting stud and tighten to 24 Nm (18 ft. lbs.).

BACK
6. Install the brake line on the sensor stud and install the nut.
7. Lower vehicle.