Tone Wheel

REMOVAL - FRONT TONE WHEEL
1. Raise the vehicle.
2. Remove the wheel and tire assembly.
3. Remove brake caliper from the knuckle and brake rotor and hang out of the way.





4. Using hex wrench or driver socket, remove screw retaining tone wheel to hub and bearing.
5. Remove tone wheel.

INSPECTION - TONE WHEEL
Tone wheels can cause erratic wheel speed sensor signals. Inspect tone wheels for the following possible causes.
^ Missing, chipped, or broken teeth
^ Contact with the wheel speed sensor
^ Wheel speed sensor to tone wheel alignment
^ Wheel speed sensor to tone wheel clearance
^ Excessive tone wheel runout
^ Tone wheel loose on its mounting surface
Rear tone wheels are pressed onto their mounting surfaces and should not rotate independently from the mounting surface.
If a front tone wheel is found to need replacement, the tone wheel can be replaced as a separate component.
If a rear tone wheel is found to need replacement, the axle shaft must be serviced. No attempt should be made to replace just the tone wheel.
Check the gap between the speed sensor head and the tone wheel to ensure it is within specifications.
Excessive wheel speed sensor runout can cause erratic wheel speed sensor signals. If front tone wheel runout is excessive, determine if it is caused by a defect in the tone wheel or hub and bearing. If rear tone wheel runout is excessive, determine if it is caused by a defect in the axle shaft assembly or hub and bearing. Replace as necessary.

INSTALLATION - FRONT TONE WHEEL
1. Make sure mating surface of tone wheel and hub and bearing is clean.





2. Install tone wheel through the seal on the rear of the knuckle and against the rear of the hub and bearing assembly.
3. Using the same bolt or identical replacement bolt, mount tone wheel to the hub and bearing. Tighten bolt to 12 Nm (110 inch lbs.) torque.
4. Verify proper wheel speed sensor to tone wheel air gap.
5. Install brake caliper.
6. Install the tire and wheel assembly. Progressively tighten the wheel mounting nuts in the proper sequence to 122 Nm (90 ft. lbs.) torque.
7. Lower the vehicle.
8. Road test the vehicle to ensure proper operation of the base and antilock brakes.