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post #1 of 20 (permalink) Old 11-05-2006, 01:50 PM Thread Starter
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pcm

if the pcm is bad will that cause the car to jerk and run the battery down my car wont start jumped it last week, but checked this morning nothing
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post #2 of 20 (permalink) Old 11-05-2006, 02:19 PM
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Not likely.

Have you checked your alternator, battery, and connections? It is more likely one of those. Is there any trouble codes?
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post #3 of 20 (permalink) Old 11-05-2006, 02:44 PM
 
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A bad starter that pulls way too much current will also kill things. A drained battery can't be charged in 'round town driving.
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post #4 of 20 (permalink) Old 11-05-2006, 03:36 PM
 
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Actually, that was exactly the problem with my car. The battery was constantly draining, sometimes recharging, sometimes over-charging. Several times the car would jerk like crazy for a few minutes, then die as soon as I slowed down. It was not the battery, alternator, starter or anything. I switched out the PCM and everything worked beautifully. I have a 1st gen, so it may be different for you. But, I picked up a PCM for 15 bucks, so if you have the chance, it is worth a try before you move on to more expensive/difficult things.
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post #5 of 20 (permalink) Old 11-05-2006, 03:40 PM
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Theres a big difference between 1st gen and 2nd gen PCMS. It possible that the PCM could be at fault, but unlikely. Unlike 1st gen, 2nd gen PCMS are not interchangeable, so he would have to get a new one - $300-$500.
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post #6 of 20 (permalink) Old 11-05-2006, 03:43 PM
 
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That's good to know. But why are they not interchangable? Is every single one unique or what?
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post #7 of 20 (permalink) Old 11-05-2006, 03:59 PM
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^They are programmed vin specific. The reason is the body control module. Basically the PCM programming and security keys have to match the BCM. The same PCM will run all 3 engines in the 2gen, but wont work with any other BCM except for its original one.

You can find a pcm from a 2.7 base intrepid with no security system or options and swap them, but it is hit or miss whether your car will start when you install it. You also run the risk of corrupting the security keys in the BCM by installing a PCM with different ones. Then your screwed.


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post #8 of 20 (permalink) Old 11-05-2006, 04:02 PM
 
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Wow. Screw technology.
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post #9 of 20 (permalink) Old 11-05-2006, 04:09 PM
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Quote:
Originally Posted by 32Intrepid
^They are programmed vin specific. The reason is the body control module. Basically the PCM programming and security keys have to match the BCM. The same PCM will run all 3 engines in the 2gen, but wont work with any other BCM except for its original one.

Not completely true. The PCM needs to recognize the RKE only. As long as the RKE & PCM are mated, you can use any BCM you please. I have a different one in my car right now, from a Special so as to have the correct tire size for the 245 tires. You just need to be sure to keep the original RKE module in the car.
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post #10 of 20 (permalink) Old 11-05-2006, 04:25 PM
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Not completely true. The PCM needs to recognize the RKE only. As long as the RKE & PCM are mated, you can use any BCM you please. I have a different one in my car right now, from a Special so as to have the correct tire size for the 245 tires. You just need to be sure to keep the original RKE module in the car.

RKE module? I thought it needed the same SKIM module.

It was my understanding that if you have a mating PCM and SKIM module + the correct keys and locks (obviously!) that it would work.
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post #11 of 20 (permalink) Old 11-05-2006, 04:38 PM
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RKE module? I thought it needed the same SKIM module.

It was my understanding that if you have a mating PCM and SKIM module + the correct keys and locks (obviously!) that it would work.
Sorry, my mistake - you are right - SKIM, not RKE, but the BCM/PCM relation doesn't matter. The only issue will be a misatch of the mileage as it is stored in both the PCM & BCM. The cluster will register the BCM mileage; the dealer can access the "actual" mileage via the DRBIII tool, so you can't cheat them.
Again apologize for citing the wrong module.
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post #12 of 20 (permalink) Old 11-05-2006, 05:08 PM
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That answers ALL my questions!

Sweet! So I dont need to get the odometer reprogrammed!

So the recepie for a fast Intrepid ES is PCM + Plemum + SKIM module + transfer gears....... dragstrip not included
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post #13 of 20 (permalink) Old 11-05-2006, 05:09 PM Thread Starter
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got a new battery and connectors car cut off got a jump start on the way home car started to jerk but quit now it wont even turn over post not dirty plus i also have a bad headlight switch or turn sigal switch can this do something
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post #14 of 20 (permalink) Old 11-05-2006, 06:52 PM
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Quote:
Originally Posted by Torontofirecaptain
Sorry, my mistake - you are right - SKIM, not RKE, but the BCM/PCM relation doesn't matter. The only issue will be a misatch of the mileage as it is stored in both the PCM & BCM. The cluster will register the BCM mileage; the dealer can access the "actual" mileage via the DRBIII tool, so you can't cheat them.
Again apologize for citing the wrong module.

Well you learn something everyday. Its the SKIM that must match everything else. I was under the impression that this was all contained in the BCM and the SKIM was not a separate module.

Skims dont match, you get a no-start.

How can it be determined which ecm has skim or not then?
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post #15 of 20 (permalink) Old 11-05-2006, 07:32 PM Thread Starter
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battery new i got a bad headlight switch or turn signal switch car jerked upshifted and down shifted now is this the pcm
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