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function of the crank/rpm sensor???? 900

posted by  Don Foster on  Thu Dec 11 01:25 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

The crank sensor actually senses rotation (and timing, or position) of the flywheel -- or flexplate, if an A/T. Because the flywheel or flexplate is bolted to the crank, the sensor detects crank rotation and timing. Hence it's called a "crank sensor."

The sensor doesn't respond to rotation of the tranny, per se, because the tranny is linked to the engine through the torque converter, which is a fluid (slipping) coupling.

A defective or failed crank sensor will fail to detect the flywheel rotation, so the electronic control unit will not produce a spark pulse and also will not trigger the FI system to inject fuel. That's a pretty good reason for your engine to not start.

--
Don Foster (near Cape Cod, MA)






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