Last post on Jun 01, 2013 at 11:25 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, Jeep, Electrical, SUV
#18 of 160 1993 jeep Grand cherokee PCM?
Nov 19, 2007 (6:26 pm)
Again, I am not getting any spark to the plugs. I pulled the wire off and put a new spark plug in the end of the wire and saw no spark. If the spark was low/poor from the coil woild it still have spark at the end of the spark plug wire? I checked to make sure the firing order was right and it is. This is what happend to start off with, I was pulling my boat out of the water and stoped at the top of the boat ramp and turned off the engine. It NEVER restarted and this is where we sit now. I am sure is somthing realy stupid because it was running just fine before I turned it off. Thanks so much for all the help.
#19 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 20, 2007 (2:33 pm)
try and just hook the coil wire to your new spark plug and see if you get a good spark should realey spark when you turn the enginne over
#20 of 160 Re: 1993 jeep Grand cherokee PCM?
Nov 20, 2007 (2:52 pm)
I did that and the spark looks ok? I am just at a loss on why there would be spark at the coil and to the end of the coil wire into the cap but not out into the plugs? Am I going tin the wrong direction here?
#21 of 160 Re: 1993 jeep Grand cherokee PCM? [jeffwtuttle]
Nov 20, 2007 (6:11 pm)
try to put the old roter back on sounds as if you have a bad roter even thogh it is new just replace the old stuff back on and see if you get spark has to be short inside dis cap or roter
#22 of 160 1993 jeep Grand cherokee PCM?
Nov 20, 2007 (7:44 pm)
Did that too, still the same problem. Besides It just quit on the boat ramp and wouldnt start so I replaced the cap and rotor 2 times now one with the jeep oem and one with the schucks aftermarket. them I put the one that was on the car back on and still the same thing...3 bad rotors?
#23 of 160 2000 JGC - will not start
Nov 23, 2007 (4:28 am)
I am reluctant to take my jeep into the dealer but have had no other choice. The jeep has a new battery for starters and cranks over, just does not start. The fuel gauge is not reading with the key in the on position. The dealer says they need 2-3 hours just to figure out what might be wrong. They are indicating maybe the PCM, TCM or the cluster.. they don't know. Currently he indicates he can't communicate with them. I have looked through a lot of information and it appears maybe the PCM is the problem. Two Questions
Given the symptons does any one have any advice?
Does any one know where to get a PCM other than the dealership that is legitimate and a decent price.
Any help would be great thanks.
#25 of 160 2000 JGC - will not start - PCM is the problem
Nov 23, 2007 (6:01 am)
The pcm is gone on this 2000 GTC 4.0l and the dealer indicates a skim module is also required (sentry module key). Is this true or can you just replace the PCM after it has been programmed for the vehicle? No one seems to want to give this information out they just want the 1000.00 for the pieces. Any help is appreciated.
#26 of 160 alarm system
Nov 25, 2007 (2:29 pm)
Sentry module? OEM alarm system? Ask the dealer to fix THAT first & be sure to mention you have a 'SPARE' PCM ready & waiting so no need to put a new one in just yet... *(Unless it's a freebie under warranty!).
The danged OEM (and aftermarket...) alarm systems have been known to go out & prevent starting.
There's also the ever popular ignition switch (not the key unit - the electrical switch itself), there's an interlock / latch relay, the fuel pump (has ya got's pressure???), the Neutral safety switch (NSS)...
Hmmm - NSS... Have you tried starting it while cycling thru the gears w/ your foot on the brake??? Just turn the key to start w/ one hand & use the other hand to go from Park to 1-2 & back up. (Keep yer foot on the brake!) The NSS, which is down below where the water from that boat launch was, could be full of water & gummed up. Fairly easy to remove & rebuild. (Article & 'how to' linkages on my website.) Crown Automotive online sells them for about $110, Don't even ask what the dealer charges...
#27 of 160 1993 jeep Grand cherokee PCM?
Nov 25, 2007 (8:29 pm)
Humm, Interesting thought. I never thought of a NSS before.Dosent the NSS keep the starter from working? It will crank over when use the key but I will try to see if it does when I run it in the gears? So if it continues to start while in gear should I replace the NSS at that point? What if the same thing continues? Is the factory alarm system integrated in the PCM? Because when I got another PCM from the bone yard they asked if it was a factory alarm..? all I know is it has the key card by my knees and when I pull it out it disables the starter. The horn doent beep or anything like that.
Where is your website link? just in case I find the NSS to be the problem