Tone Wheel: Inspection: Notes

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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

If a front tone wheel is found to need replacement, the axle shaft must be replaced. No attempt should be made to replace just the tone wheel.