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Unread 03-25-2009, 06:13 AM   #1
DesertOne
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Crank Position Sensor, Which One?

I want to change the Crank Position Sensor on my 1996 Jeep Cherokee Classic. But I am not sure which one to get. When looking for one, Some ads say (with updated OD2 Code Connector) and others say OE replacement.
Is there something I should look for to know which one I have?

And is this hard to do myself? Like can I just un-bolt the old one and replace it? Easy as replacing an O2 sensor?

Thanks

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Unread 03-25-2009, 06:48 AM   #2
bamasteeler
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not sure bout the plug thing but yes it is easy to do. i do know that the plugs are different on say your 96 compared to my 99. i just bit the bullet and got mine form the jeep dealership.
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Unread 03-25-2009, 04:24 PM   #3
tjwalker
It's the crank sensor!
 
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Get an OEM replacement. Avoid the el-cheapo sensor unless you enjoy doing things twice. SEARCH for information on replacement; there are tons of pages of light reading which will help you through your installation. It's not real hard but is kind of a PITA in my opinion and there are a few tips that you should be aware about ahead of time.
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Unread 03-25-2009, 05:07 PM   #4
BrunoS
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why change it? better to leave it alone; purchase a spare and wait to install it. some would argue to install it and keep the used one...i argue that if that's done, you:

1) have a new one that when it goes dead you
2) are left with the spare that has umpteen miles on it, meaning:
3) you will go buy a 2nd new one.

this is probably one sensor that if you've got 150k on it and it has NOT died, then will probably outlast the jeep. save your $70 for now.
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Unread 03-26-2009, 05:15 AM   #5
tjwalker
It's the crank sensor!
 
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Changing out a crankshaft position sensor though is a pain IMHO, and is easier accomplished in the garage or driveway than on the side of the road or on the trail.

As they are a relatively common failure on the 4.0 and don't always, but definitely CAN leave you stranded if the sensor fails catastrophically, replacing them before failure is a strategy that many 4.0 owners consider; to each their own on this.
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Unread 03-26-2009, 05:51 AM   #6
DesertOne
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Thanks.

The reason I want to change out the CPS is because it has been suggested before that some of my problems I am expereincing to do with the CPS.

I.E. Sometimes the Jeep just dies. Then after cranking several times it will run . Sometimes ruff, other times better than original.

I will have to check with the parts store on the recommended replacement since they have an OE replacement version and the OE version with OBD update.


Thanks Again
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Unread 03-26-2009, 05:47 PM   #7
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by DesertOne View Post
Sometimes the Jeep just dies. Then after cranking several times it will run . Sometimes ruff, other times better than original.
Ever see a check engine light?

Very definitely could be the crank sensor and that would be my guess, but the ignition coil can get flaky as well; just keep that in mind.

Might be interesting to test both the crank sensor and the coil to see where you are at. It might not be definitive but I've seen where testing can lend a clue.

With the crank sensor, you're looking for resistance between 125-275 ohms. If you're out of spec or near out of spec, I'd change it out.
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Unread 03-26-2009, 11:35 PM   #8
drvn93
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on the yj forum they were talking about taking out the cps, cleaning it and then putting it back..since something about a dirty sensor can give bad readings
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Unread 03-27-2009, 05:27 AM   #9
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by drvn93 View Post
on the yj forum they were talking about taking out the cps, cleaning it and then putting it back..since something about a dirty sensor can give bad readings
I don't think I would try to clean a hall effect sensor and if you're going through the work of removing the sensor, it would be advisable to actually replace it and be done with it.

Not impossible that a crank sensor connector could be dirty though. If you want to give it a try, remove the connector for the crank sensor and clean it thoroughly with electrical contact cleaner, a dab of dielectric grease and reconnect. No guarantee but dirty connectors = resistance= which could manifest as an intermittent condition. You should clean the crank sensor connector INSIDE the engine bay as well. It's at the back, near the #6 injector. If you're cleaning connectors, clean em both.

I would definitely get a resistance reading on the sensor itself. Takes about 2 minutes. If the sensor is outside of spec, then changing it out would be the best strategy.

Here's the way to test the sensor for your 1996; the info I gave you about resistance between 125-275 was incorrect; that's for earlier vintage RENIX XJs. Correct info. below
-------------------------------------------------------------------------

CRANKSHAFT SENSOR TESTING PROCEDURE: 1991 – 2001 4.0L H.O. engines

1. Near the rear of intake manifold, disconnect sensor pigtail harness connector from main wiring harness.

2. Place an ohmmeter across terminals B and C. The terminals are identified as A-B-C looking into connector from left to right with the “notch” in the middle of the connector on your right. Ohmmeter should be set to 1K-to-10K scale for this test.

3. The meter reading should be open (infinite resistance). Replace sensor if LOW RESISTANCE
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Unread 03-29-2009, 09:04 PM   #10
DesertOne
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Thanks for the input. Will look on net for the procedure in changing it out.
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