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Unread 06-20-2010, 08:41 PM   #1
nvwoody
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Join Date: Mar 2010
Location: reno
Posts: 1
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, 08:54 PM   #2
SoonerYJ
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2011 JK Wrangler 
 
Join Date: Aug 2004
Location: Norman, Oklahoma
Posts: 295
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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Unread 06-20-2010, 10:04 PM   #3
Unbalanced
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1986 CJ7 
 
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Any chance you've got access to a scope?

That's the only way I know of ~really~ testing one.
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Unread 06-20-2010, 11:49 PM   #4
JeepnBlake
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2004 TJ Wrangler 
 
Join Date: Jan 2008
Location: Lincoln Nebraska
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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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