Quote:
Originally Posted by 9fourteen
I am guessing that power (or ground) must be supplied on the third pins, labeled 23 and 78 on the holder (Clark's diagram) and without that connected up I was unable to test at the sensor itself. I would also assume these pin, 23 and 78 must go someplace else other than the DME plug since there is not a 78 pin on the DME connector.
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Contrary to a previous post, there is no power or ground to the flywheel sensors. They actually generate a pulse from either the teeth on the starter ring gear or from the tdc stud on the flywheel (at least on the 8 valve cars). The third pin is for a shield around the two signal wires.
Our bench test for sensors is to use the oscilloscope and a steel rod to generate the signal. No voltage or ground required.