SENSOR-FRONT WHEEL SPEED
DESCRIPTION
A wheel speed sensor is used at each wheel. The front sensors are mounted to the steering knuckles. The rear sensors are mounted at the outboard end of the axle. Tone wheels are mounted to the outboard ends of the front and rear axle shafts. The gear type tone wheel serves as the trigger mechanism for each sensor.
OPERATION
The sensors convert wheel speed into a small digital signal. The ABM sends 12 volts to the sensors. The sensor has an internal magneto resistance bridge that alters the voltage and amperage of the signal circuit. This voltage and amperage is changed by magnetic induction when the toothed tone wheel passes the wheel speed sensor. This digital signal is sent to the ABM. The ABM measures the voltage and amperage of the digital signal for each wheel.
REMOVAL
1. Raise and support the vehicle.
2. Remove the tire and wheel assembly.
3. Remove the caliper adaptor bolts. Support the caliper and adaptor assembly Do Not let assembly hang by the hose. (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/DISC BRAKE CALIPERS - REMOVAL).
4. Remove the disc brake rotor (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/ROTORS - REMOVAL).
5. Remove the front wheel sensor mounting nut (2) to the hub (3).
6. Remove the wheel speed sensor (1) from the hub (3).
7. Disconnect the wire sensor routing clips (2).
8. Disconnect the wheel speed sensor wire connector (1).
9. Remove the sensor and wire.
INSTALLATION
1. Reconnect the wheel speed sensor wire connector (1).
2. Reroute and connect the wheel speed sensor wire to the routing clips (2).
3. Install the wheel speed sensor into the hub (3) and the install the mounting bolt (2) and tighten the nut to 12-14 N·m (106-124 in. lbs.).
4. Check the sensor wire routing (1). Be sure the wire is clear of all chassis components and is not twisted or kinked at any spot.
5. Install the disc brake rotor (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/ROTORS - INSTALLATION).
6. Install the caliper adaptor over the rotor.
7. Install the caliper adaptor bolts and tighten to 90-115 N·m (66-85 ft. lbs.) (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/DISC BRAKE CALIPERS - INSTALLATION).
8. Install the tire and wheel assembly.
9. Remove the support and lower vehicle.