Tone wheels can cause erratic wheel speed sensor signals. Inspect tone wheels for the following possible causes.
If a front tone wheel is found to need replacement, the halfshaft must be replaced. No attempt should be made to replace just the tone wheel.
If a rear tone wheel is found to need replacement, the tone wheel is incorporated into the hub and bearing assembly and the hub and bearing must be replaced.
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:
1999-00 Wheel Speed Sensor to Tone Wheel Clearance
2001-05 Wheel Speed Sensor to Tone Wheel Clearance
Excessive tone wheel run-out can cause erratic wheel speed sensor signals. Maximum allowable tone wheel run-out:
If tone wheel run-out is excessive, determine if it is caused by a defect in the halfshaft 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. Replacement of the front halfshaft or rear hub and bearing is necessary.
Removal & Installation
The tone ring (toothed wheel) is not separately serviceable. If any of the teeth are deformed, replace the driveshaft assembly (front) or the brake rotor (rear).