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Posted by TRJ (more from TRJ) on Fri, 24 Sep 2004 18:30:17 Share Post by Email
In Reply to: Crank position sensor, Tom, Fri, 24 Sep 2004 15:09:23
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I replaced mine, link below.
I think there is a magnet on the periphery of the crank pully (or something that triggers a 1 RPM signal). As Sam stated, the CPS sits behind it (aka Harmonic Balancer). The CPS counts the number of times the pully cycles as the crankshaft turns. The engine computer receives this information and calculates optimal air/fuel mixture, taking other sensor inputs into consideration as well (AMM, O2 sensor, etc.).

If it stops sending the signal, the ECU assumes the crank isn't turning and won't ask for more fuel. A common mode of failure for the CPS is as the engine heats: starts, idles fine, warms, stalls, no bounce on the tach and no start on retry (fuel starved). 20 minutes later it will start and do the same thing. That's why the cold water test is a great trouble-shooting trick: it cools the sensor to below failing temperature.

Getting the nut off the CPS is the toughest part of the replacement procedure, however I did not have to thread the cable & connector behind the engine (I spliced mine by necessity).


posted by 68.198.101...

CPS thread

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