01 grand cherokee P1391 - Page 2 - JeepForum.com
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post #16 of 50 Old 09-08-2019, 03:34 PM
CarlJH
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Grounds G102+G103 are used by the PCM and TCM so needs fixing even if they don't help with the fault code!

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post #17 of 50 Old 09-08-2019, 06:44 PM Thread Starter
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Just my opinion, but I would verify what those damaged wires do or just fix them. That is a red flag of an issue. Itís something that is damaged. Alldatadiy has decent prints and is not expensive.
Got the wires taped up, there no longer touching. Jeep runs the same, still not sure what the wires are for though. Ill have to look into "alldatadiy" ive never heard of that. I appreciate the help.
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post #18 of 50 Old 09-08-2019, 06:51 PM Thread Starter
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Originally Posted by CarlJH View Post
Grounds G102+G103 are used by the PCM and TCM so needs fixing even if they don't help with the fault code!
I just want to confirm since the wires are not touching they are "fixed" right?
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post #19 of 50 Old 09-08-2019, 07:10 PM
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Ok, are the cam and crank sensors original mopar ones? or aftermarket replacements? when my cam sensor went bad I researched into either cheap aftermarket or mopar and found that WJ's only like proper mopar sensors so went to the dealer for it.
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post #20 of 50 Old 09-08-2019, 07:14 PM Thread Starter
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Ok, are the cam and crank sensors original mopar ones? or aftermarket replacements? when my cam sensor went bad I researched into either cheap aftermarket or mopar and found that WJ's only like proper mopar sensors so went to the dealer for it.
I had already ordered the 2 sensors before i read that they only liked the mopar ones. So they are the cheap ones. I still have the originals, assuming they are fine since the new cheap ones didnt change anything. And by cheap ones i mean from amazon.
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post #21 of 50 Old 09-09-2019, 06:58 AM
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you did use jeep sensors?
Did you see anything in freeze frame that could help?
Is the cp9180 able to see (CMP CKP) SYNC - this would check timing TDC.

I would want to see wave forms for sensors, see if either is really going flat - no signal.

Yes those wires have me guessing, between the rear of engine CKP and foward on engine is the CMP with o2 sensor in middle .... I am not focusing on anything else there - no codes to help, no known issues ie AC inop - I cant think what they are....

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #22 of 50 Old 09-09-2019, 07:25 AM
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Quote:
Originally Posted by CarlJH View Post
Grounds G102+G103 are used by the PCM and TCM so needs fixing even if they don't help with the fault code!
I just want to confirm since the wires are not touching they are "fixed" right?
Not necessarily. If they’re ground wires, you would check for continuity between the individual wires and separate ground points to determine if the wires are damaged and see if they’re actually grounding.
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post #23 of 50 Old 09-09-2019, 07:36 AM Thread Starter
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No they were aftermarket sensors, is there any reason for me to believe its the pcm? Would it be throwing a code for the pcm if it was?
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post #24 of 50 Old 09-09-2019, 09:04 AM Thread Starter
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I dont know what to look for in the freeze frame to be honest, i dont know what would be a good/bad signal
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post #25 of 50 Old 09-09-2019, 03:33 PM Thread Starter
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This is the voltage going to the cmp sensor, i checked at the ground for continuity and they are fine, cmp seems to be getting 5v. These are also the wires that were messed up. Does anyone know which pin for the cmp out of pcm? Im stumped here.
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post #26 of 50 Old 09-09-2019, 04:37 PM Thread Starter
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Also is it normal
For the top of the magent on my crankshaft position sensor to be scarred?
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post #27 of 50 Old 09-09-2019, 04:54 PM
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they are not supposed to touch the tone ring, the cam sensor sometimes gets a shim to get the correct clearance, which you have to be careful not to miss when changing them, so maybe the crank sensor also gets a shim sometimes?
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post #28 of 50 Old 09-09-2019, 05:42 PM
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This is the voltage going to the cmp sensor, i checked at the ground for continuity and they are fine, cmp seems to be getting 5v. These are also the wires that were messed up. Does anyone know which pin for the cmp out of pcm? Im stumped here.
What do you mean when you say “these were also the wires that were messed up”? The CMP wires.

If you get an Alldatadiy subscription, you can access all the wiring diagrams, sensor diagrams, etc.
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post #29 of 50 Old 09-09-2019, 06:03 PM Thread Starter
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I traced the wires that i had to tape up, after checking the continuity from the connector ring to past the damaged insulation and they checked out fine, i then traced them to the cmp, and checked the voltage going to the connector without the battery being connected. I think the tern is the “static voltage” when done that way? Anyways it was reading 5v at the connector so my assumption was the wires are fine.
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post #30 of 50 Old 09-09-2019, 06:05 PM Thread Starter
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I cut a spacer thats almost exactly .01 inches thick. Im going to try that and see if that will get my ckp off the tone wheel. Maybe thats the whole issue.
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