Crank position sensor test? -
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Unread 06-20-2010, 09:41 PM   #1
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Join Date: Mar 2010
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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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Unread 06-20-2010, 09:54 PM   #2
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2011 JK Wrangler 
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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.

2011 Flame Red Rubicon (2-Door) with every option.
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Unread 06-20-2010, 11:04 PM   #3
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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
2012 Overland
"Temporarily Detained" maybe, but ~never~ stuck...
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Unread 06-21-2010, 12:49 AM   #4
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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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