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post #1 of 3 Old 10-28-2016, 09:31 AM Thread Starter
Tinymite1979
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help (Crankcase Sensor issues)

Help I have a 94 grand cherokee that keeps frying the crankcase sensor. Any ideas would be greatly appreciated

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post #2 of 3 Old 10-28-2016, 09:51 AM
14Sport
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1995 YJ Wrangler 
 
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Location: The Dirty South
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Which motor and trans do you have? Are you using the factory bolt(s)? Are you using the factory spacer is applicable?


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My observations are based on my experiences...YMMV.
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post #3 of 3 Old 10-28-2016, 11:23 AM
Uniblurb
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Yep, knowing whether your engine is the 4.0 or the 5.2 V8 helps.

If you're using new aftermarket crankshaft position sensors are you sure they aren't bad to begin with rather than 'frying'? I tried 2 brand new aftermarket crank sensors and they were just as bad out of the box as my bad Mopar/OE sensor. Try the crank sensor resistance test in my signature.

If you have a bad PCM ground on the engine block the crank sensor is the first thing to fry w/o a good ground in addition to possibly frying the PCM. Bad PCM ground on my 96 4.0 took out 2 PCM's and 2 Mopar crank sensors to boot.

Look in the dirty dozen thread in my signature and you will see under the 'Grounds' section a link to the 4.0 PCM ground photo on one of the coil studs. The V8 PCM ground can be seen below in the first photo.

http://www.jeepforum.com/forum/f13/n.../#post36679378

It should be noted on the 93-95 ZJ's the crank sensor takes 8V of voltage unlike the 96-98 crank sensors which use 5V. You may want to back-probe the 'C' cavity on the on the sensor connector while going to a ground with the black probe on your meter to see if you're getting 8V of power to it. Note the power will only go to this sensor for a few seconds when 1st turning the key on. Don't cross your probes with key on or you could fry something in the PCM or sensor itself. Good luck.

96 4.0 ZJ Laredo, 2004 4.7L WJ Limited, 96 4.0 XJ (son's)


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