Either the sensor or the ring gear(reluctor) was damaged. The ring if hit even by accident can be de-magnetized, and stop working! If you have a DVOM, you can test which one is bad, unplug the sensor at the end of the wire near the top of the sensor, read OHMs, they should be about, 088-1400 ohms, now switch the meter to read volts, spin the wheel, and you should get a voltage reading, it will vary depending how fast you spin! No OHMs, bad sensor, no Volts, bad ring gear!
Thursday, April 24th, 2008 AT 3:42 PM