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04_yelneon · Post by **04_yelneon** » Thu May 28, 2009 11:45 am

I found my electrical problem. My coil plug was not giving power to my secondary circuit. I had my tech @ work look at it an my ECM is done. Thats why my car is only firing in cylinders 1 an 4. Any who, tomarrow im hitting the junk yards to find me a new ECM. But I want to make sure I am getting the right one. I can get one from an 03-05 neon, but does it matter if the car im taking it out of is an MTX or ATX? I wasnt sure if that matterd. I have a 04 MTX. In some cars the ECM is different if the car is manual or auto. And then im off to dodge to have it flashed if I do find one. Thanks

OB · Post by OB » Thu May 28, 2009 12:22 pm

The computers should all be the same 03+. The ATX PCMs will have a different flash program for the electronic controls of the trans. You will only need it flashed for the SKIM key, or if it's from an RT model, because it will work plug n' play otherwise.

Post by **occasional demons** » Thu May 28, 2009 12:23 pm

It will need to be a MTX PCM.
Is he sure the coil itself isn't bad?
The power is the center pin, and the PCM grounds the outer pins alternately to enegize the coils. I would put a test light on each of the outer pins/wires and connect the other end to the positive battery post. Crank the engine. If the light flashes on both pins, the PCM is good.

Post by **occasional demons** » Thu May 28, 2009 12:25 pm

OB wrote:The computers should all be the same 03+. The ATX PCMs will have a different flash program for the electronic controls of the trans. .

Can it be re flashed to avoid a CEL for the missing ATX signals?
Also the rev limit will be lower.

OB · Post by OB » Thu May 28, 2009 12:26 pm

Yeah, the PCM should have diodes built in to it to prevent a surge caused by a coil short. I'd try a different coil before swapping PCM's.

04_yelneon · Post by **04_yelneon** » Thu May 28, 2009 3:34 pm

yeah i know the coil is good because i had an msd coil on there when this all went down. I put the stock coil on an im getting the same results. I checked the coil many times 2 b sure that it was good. whats not getn power is the plug that plugs into the coil. the secondary terminal is not getting any voltage. I took it to my job an a tech ran through it all, an came up with the same results. He said the ECM needs to b replaced. My car had a power surge, popped the MSD coil an damaged the ECM. He said it could have been a faulty coil. So I need to get a 03-05 MTX ECM. I checked with the dodge dealership, an its like 500 bucks for a new an it being programed. so, the junk yard is whats in my budget.

OB · Post by OB » Thu May 28, 2009 4:10 pm

occasional demons wrote:
OB wrote:The computers should all be the same 03+. The ATX PCMs will have a different flash program for the electronic controls of the trans. .
Can it be re flashed to avoid a CEL for the missing ATX signals?
Also the rev limit will be lower.

It won't work without the flash, but as far as I know they are internally the same. The MTX just doesn't get the additional features when it is flashed initially.

Post by **occasional demons** » Thu May 28, 2009 6:26 pm

OB wrote:
occasional demons wrote:
OB wrote:The computers should all be the same 03+. The ATX PCMs will have a different flash program for the electronic controls of the trans. .
Can it be re flashed to avoid a CEL for the missing ATX signals?
Also the rev limit will be lower.
It won't work without the flash, but as far as I know they are internally the same. The MTX just doesn't get the additional features when it is flashed initially.

I bet a lot of ppl that have done (NGC) MTX swaps would have liked to kinow that.

OB · Post by OB » Thu May 28, 2009 7:08 pm

I'm not 100% sure but that's what I've gathered with the research I've done. It makes sense from a manufacturers standpoint; lower production costs since only one PCM is used. The differences are in the software, which obviously doesn't cost them anything once the engineering has been done.

Post by **occasional demons** » Thu May 28, 2009 9:11 pm

Of course convincing a dealer to convert it for you may be another matter. They'll prolly tell you you have to buy a new one, and have it flashed.

You just have to convince them there is more profit in reprogramming the existing one.