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740 ignition failure solved: crank position sensor bad 700 1991

posted by  T-Ward on  Mon Sep 15 15:32 CST 2003
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After replacing all I was comfortable replacing (plugs wires, cap, rotor and a questionable ignition module, I was stumped. I couldn't find any help on brick road, so I called a couple of shops, one a dealership, and got information on how to check out the crank position sensor. For what it's worth:

Measure the signal while the sensor is still installed by unplugging the sensor at the cable connections at the firewall to the drivers side of the engine. Measure voltage here as the engine is being cranked. Use a low voltage setting on a volt meter, preferably in an alternating current setting if available in a low voltage setting. If no signal is detected, the unit is suspect.

The other simple measurement is to unplug the unit (without removing it from its location behind the engine on top of the transmission housing). Check all 3 terminals for resistance or an open circuit. The new sensor measured about 160 ohms between the center lug and a side lug. My old defective unit had no continuity and no measurable resistance. Hope this might help someone.






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