Tone Wheel

If a rear tone wheel is found to need replacement, the rear hub and bearing must be replaced. No attempt should be made to replace just the tone wheel.

If wheel speed sensor to tone wheel contact is evident, determine the cause and correct it before replacing the wheel speed sensor or tone wheel.

Check the gap between the speed sensor head and the tone wheel to ensure it is within specifications. For wheel speed sensor air gap specifications, (Refer to SPECIFICATIONS  ).

Excessive tone wheel runout can cause erratic wheel speed sensor signals. For tone wheel runout specifications, (Refer to SPECIFICATIONS  ). If 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.

Tone wheels are pressed onto their mounting surfaces and should not rotate independently from the mounting surface. Replace the front axle shaft or rear hub and bearing as necessary.