crankshaft pos sensor - JeepForum.com

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post #1 of 29 Old 08-19-2007, 03:23 PM Thread Starter
JSBlu974X4
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crankshaft pos sensor

ok, so I was tripping codes when It rained, and the jeep wouldnt start here and there and the code was this sensor. Anyone know where exactally its located or pics of where it is? How hard is the swap?


Thanks
Sully


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post #2 of 29 Old 08-19-2007, 03:28 PM
Jerry Bransford
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It's located up near the top on the driver's side, where the tranny bolts to the engine. Once you get a socket wrench on it, it's not bad but you'll need several extensions (use a 3/8" drive) to reach it. It's held on with two small bolts if you have a manual tranny or one small bolt if you have an automatic. The plug for it is up nearer the engine, you can reach it easier as I recall from the top.

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post #3 of 29 Old 08-19-2007, 04:10 PM
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Ive only done it on a Cherokee, but I had to do it all from underneath. Here's a write up some one from the Cherokee board wrote up. http://www.jeepforum.com/forum/f11/crank-position-sensor-write-up-197260/ It makes it sound a little easier than it is and my CPS bolts were 7/16" not 12mm like the article stated so dont take it ver batem, just as a helping hand.

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post #4 of 29 Old 08-19-2007, 04:29 PM Thread Starter
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got it, thanks jerry, it was pretty easy from the bottom. 2 11mm's. but thanks, imma test drive it in a little. the jeep would randomly crank and not start at awkward occasions the past week or so. hopefully this fixes it.

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post #5 of 29 Old 08-20-2007, 03:26 PM
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Quote:
Originally Posted by JSBlu974X4
got it, thanks jerry, it was pretty easy from the bottom. 2 11mm's. but thanks, imma test drive it in a little. the jeep would randomly crank and not start at awkward occasions the past week or so. hopefully this fixes it.
Make sure the wires arent tucked next to the exhaust manifold getting burnt up and shorted out
That was the problem I had, I zip tied the wires out of the way.
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post #6 of 29 Old 08-22-2007, 04:25 PM Thread Starter
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Ok so i replaced the sensor and its been working good for 2 days or so, then today I tripped a check engine light with the codes again? Why is this?

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post #7 of 29 Old 08-23-2007, 03:48 PM Thread Starter
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anyone? the check engine light is still on, and it did the no start thing today after work. anyone? can something cause the sensor to go bad or is the only option just a bad sensor.

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post #8 of 29 Old 08-23-2007, 03:58 PM
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Quote:
Originally Posted by JSBlu974X4
ok, so I was tripping codes when It rained, and the jeep wouldnt start here and there and the code was this sensor. Anyone know where exactally its located or pics of where it is? How hard is the swap?


Thanks
Sully

exactly what codes did your Jeep show??
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post #9 of 29 Old 08-23-2007, 04:01 PM Thread Starter
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11, 12, 55, 56

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post #10 of 29 Old 08-23-2007, 04:02 PM
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Are you pulling the codes with the key trick?

If so, you're only seeing the OBD I code displayed in the odometer. OBD I uses the same code for the cam position sensor (CPS) and the crank position sensor (CKP) so hard saying which one is the culprit.

I'd take it and get the full code read. You need the OBD II code because it will specifically tell you if its the cam position sensor or the crank position sensor.

Edit: Yea, those are an OBD I codes. Get the OBD II codes if possible.
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post #11 of 29 Old 08-23-2007, 04:14 PM Thread Starter
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ok ill get that done tonight. where is the cam position sensor at?

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post #12 of 29 Old 08-23-2007, 04:18 PM
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Quote:
Originally Posted by JSBlu974X4
ok ill get that done tonight. where is the cam position sensor at?
Pull the distributor cap off, it's under that round flat protective cover that lifts off.

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post #13 of 29 Old 08-23-2007, 04:24 PM
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Quote:
Originally Posted by JSBlu974X4
11, 12, 55, 56

i agree with Wheelin98TJ, because, correct me if i'm wrong, but 55 should be the last code shown. not sure what 56 is.
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post #14 of 29 Old 08-25-2007, 08:21 AM Thread Starter
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it was 11, 12, 54 and 55. anyone know why im tripping the code again after changing the sensor?

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post #15 of 29 Old 08-25-2007, 08:36 AM
Jerry Bransford
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Quote:
Originally Posted by JSBlu974X4
it was 11, 12, 54 and 55. anyone know why im tripping the code again after changing the sensor?
Because the code won't go away immediately, it has to have a certain number of good engine starts/running cycles without problem before the code will be erased. IF the real problem was eliminated.

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