Front Wheel Speed Sensor

OUTPUT VOLTAGE INSPECTION
1. Turn ignition switch to OFF position.
2. Hoist vehicle a little.
3. Disconnect connector of wheel speed sensor.





4. Connect voltmeter between connector terminals.
5. While turning wheel at a speed of approximately 2/3 to 1 full rotation per second, check AC voltage of sensor.
Output AC voltage at 2/3 to one rotation per second (29 - 44 Hz): 150 mV or more
If measured voltage is not as specified, check sensor, rotor and their installation conditions.

Reference





When using oscilloscope for this check, check if peak-to-peak voltage meets specification and waveform is complete.
Peak-to-peak voltage at 2/3 to one rotation per second (29 - 44 Hz): 210 mV or more

REMOVAL
1. Disconnect negative cable at battery.
2. Hoist vehicle and remove wheel.
3. Disconnect front wheel speed sensor connector.





4. Push out grommet of harness from inner fender to outside of vehicle.





5. Remove harness clamp bolts and remove front wheel speed sensor from knuckle.

CAUTION:
^ Do not pull wire harness when removing front wheel speed sensor.
^ Do not cause damage to surface of front wheel speed sensor and do not allow dust, etc. to enter its installation hole.

SENSOR INSPECTION





^ Check sensor for damage.
^ Check sensor for resistance.
Resistance between terminals: 1.2 - 1.6 k ohms at 20°C (68°F)
Resistance between terminal and sensor body: 1 M ohms or more
If any faulty is found, replace.

SENSOR ROTOR INSPECTION





^ Check rotor serration (teeth) for being missing, damaged or deformed.
^ Turn drive shaft and check if rotor rotation is free from eccentricity and looseness.
^ Check that no foreign material is attached. If any faulty is found, repair or replace.

INSTALLATION
1. Check that no foreign material is attached to sensor and rotor.





2. Install it by reversing removal procedure.
Tightening Torque (a): 23 Nm (2.3 kg-m, 17.0 ft. lbs.)

CAUTION:
^ Do not pull wire harness or twist more than necessary when installing front wheel speed sensor.
^ Fit harness grommet to inner fender securely.

3. Check that there is no clearance between sensor and knuckle.