LL4 Check Speed Sensor/Tone Ring Air Gap

- Remove the speed sensor from the front wheel hub and spindle (3K207).

- Inspect mounting boss and speed sensor mounting plate for any metal flash or debris. Clean as necessary.

- Remount speed sensor securely.

- Measure the air gap between the speed sensor and tone ring teeth. Repeat in at least two more wheel positions to ensure that gap does not vary as the wheel is turned.

NOTE: Feeler gauges can be mounted to a welding rod and inserted between the vanes of the front disc brake hub and rotor (1102) to measure air gap precisely.

- Is the gap consistent and less than 1.78mm (0.070 inch)?

YES -- Replace speed sensor. Go to LL5. LL5 Recheck Front Left Speed Sensor Output

NO -- Gap is greater than 1.78mm (0.070 inch). Air gap is too large. Replace tone ring. Go to LL5. LL5 Recheck Front Left Speed Sensor Output

NO -- Gap is not consistent. Tone ring is not pressed on straight or axle end play is too great. Go to LL6. LL6 Resolve Inconsistent Air Gap Concern