Crank position sensor test? -
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post #1 of 4 Old 06-20-2010, 08:41 PM Thread Starter
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Crank position sensor test?

I have a 1998 Jeep Wrangler 2.5L. Manual Transmission and I am getting a P1391 code. I tested the cam position sensor and it tested ok. How do I test the crank position sensor?

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post #2 of 4 Old 06-20-2010, 08:54 PM
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You might just remove it and clean it first, as the clutch wears the magnet will collect fragments and not read correctly, while its out inspect it for cracks.


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post #3 of 4 Old 06-20-2010, 10:04 PM
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Any chance you've got access to a scope?

That's the only way I know of ~really~ testing one.

1986 CJ7
2003 TJ
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"Temporarily Detained" maybe, but ~never~ stuck...
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post #4 of 4 Old 06-20-2010, 11:49 PM
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A quick way to know is it will turn over, but it won't spark if it isn't working. The problem with that theory is however other things failing will do the same thing I.E. coil, cam sensor, and so on down the line.

I had a ZJ that those went bad every so often, we found out it was due to the valve cover gasket leaking, the oil would trickle down onto the CPS and cause it to fail.


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