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Speed Sensor Check

NOTE: This is an alternate test when an oscilloscope is not available.
  1. Secure a Fresnel lens front LED from an electronics store or use Part No. 171 919 061B. Connect a 220-ohm-1/4 watt resistor in series with one of the LED terminals.
  2. Connect positive LED test lead to terminal 8 of control unit harness connector. Connect negative LED test lead to terminal 27 of same connector. Do not start engine, but operate starter. L.E.D. will flicker dimly if speed sensor is sending a signal.
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