Probable Cause
- Opto (speed) sensor is out of adjustment.
- An obstruction such as dirt or debris is blocking the Opto (speed) sensor signal.
- Opto (speed ) sensor is faulty.
Corrective Action
- Inspect the position of the Opto (speed) sensor. Adjust if necessary. Adjust the Opto (speed) sensor so that the speed sensor disc is centered within the Opto (speed) sensor.
- Inspect the Opto (speed) sensor and disc for dirt/debris buildup. Clean away any obstruction if necessary.
- Replace Opto (speed) sensor if necessary.
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