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Jeep Grand Cherokee PCM

37 messages,  Last post on Sep 30, 2012 at 7:59 PM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Electrical, SUV

Messages Page 3 of 4

#18 of 37 1993 jeep grand cherokee no spark by mercyme6

Sep 20, 2009 (3:45 pm)

I am having same problems with my jeep,the check engine light does not come on when trying to start wants to start then doesnt no spark to coil or pcm took out tested coil it was bad, tested again after removing it tested good.,fuel pump is good but still no spark, ordered a pcm off ebay for $80 that came out of 93 grand cherokee same as mine but then talked to a mechanic and they said i hope it works or hope you got the right one because he said that there are different numbers and if they dont match it may not work is this right?i guess i just thought if it came out of the same year vehicle it would work.any suggestions on fuel, pump is not starting but fuel gage is good fuel pump was replaced no spark to coil.help

#19 of 37 Re: 1993 jeep grand cherokee no spark [mercyme6] by heydeno

Sep 21, 2009 (10:41 pm)

Replying to: mercyme6 (Sep 20, 2009 3:45 pm)
They are right replacing the pcm it has to be set for the vehicle. When I ordered mine I still had to have it set they call it " Flash". On mine I think we found the problem. It was a shorted out fuel injector. When it shorted it would cause it to have no spark to the coil as well as have alot of other things go haywire. We replaced the fuel injector and it has not gave me any problems since. It has been about a month. So hopefull we did get the problem fixed. I am still keeping my fingers crossed though because it has been such a problem and costly.

#20 of 37 94 jeep grand cherokee by omniss69

Jan 10, 2010 (6:54 pm)

I nought a 94 jeep GC with a 5.2 and it wont start. its got power to the coil but no spark to the plugs it wont energize the fuel pump . the check engine light doesnt come on when you turn onthe key nor does the security system . and the display in the radio console area where the over head of the jeep is doesnt show doors ajar or anyother things there.it does crank over though
any ideas would be appreciated

#21 of 37 Re: fault code 0320 [cherokeedave2] by morley46

Jan 26, 2010 (6:28 pm)

Replying to: cherokeedave2 (Jun 27, 2009 7:03 pm)
Trying to do the exact same thing on mine, found the nut okay but you are right about the lack of room, looks like it needs an extended socket wrench handle to get at it from underneath. A further problem i have with mine is that a cable runs right over the top of it!
As an aside to that problem i have had most of the problems posted about lack/loss of power and still trying to fix it, replacing the crankshaft sensor is my next option.

#22 of 37 Re: fault code 0320 [morley46] by tuggajb

Jan 26, 2010 (7:16 pm)

Replying to: morley46 (Jan 26, 2010 6:28 pm)
bout 2 or 3 long extensions to get at the crank censer when you tighten it dont over tighten as will crack it bout 10 15 inch pounds (not much) just so will not fall off not holding the jeep together with that bolt

#23 of 37 Re: AAAAAHHHHHHH [96jeep2] by melbistylz

Oct 22, 2011 (6:53 pm)

Replying to: 96jeep2 (Aug 23, 2009 8:26 pm)
The problem is that the PCM is grounded by the firewall. I'm sure you've fixed this is an old post but if anyone else reads this. The PCM is grounded by the firewall. I found continuity with an ohm reader. I say manufacture defect. if anyone still wants to know how to remedy this stalling, electrical problem, I will be glad to share my research and answer. Original owner of a 1996 Jeep Grand Cherokee Limited. Still running after all that.... Saved a lot of $$$ working on it myself.

#24 of 37 Re: AAAAAHHHHHHH [melbistylz] by steve_ HOST

Oct 22, 2011 (6:56 pm)

Replying to: melbistylz (Oct 22, 2011 6:53 pm)
Sure, go ahead and post the solution. We have room.

#25 of 37 Re: AAAAAHHHHHHH [steve_] by vinetta

Dec 07, 2011 (1:48 am)

Replying to: steve_ (Oct 22, 2011 6:56 pm)
have they posted the fix for this pcm problem having the same problem on a 96 jeep grand cherokee laredo.

#26 of 37 Re: AAAAAHHHHHHH [melbistylz] by tcollins88

Jan 18, 2012 (11:59 am)

Replying to: melbistylz (Oct 22, 2011 6:53 pm)
I have a 2003 Jeep GC Laredo and well we can get it to start but after driving about 5 blocks it either tries to die or does and then it goes down hill from that we were told fuel pump but i dont think thats it cause we can get it to idle as long as we dont touch the gas or put it in gear. PLEASE SEND ME THE INFO thank you

Messages Page 3 of 4

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