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-   -   Removing the PCM (http://www.jeepgarage.org/f203/removing-the-pcm-39861.html)

Martyp 03-27-2012 02:47 PM

Removing the PCM
 
Hey everyone,


I've been trying to remove my PCM for about an hour this evening with no success at all. There is a huge clamp which runs right around it and I can't figure out how to take it off.

The two nuts that appear to tighten it are non access able due to the thick cables and the torqs which hold it on are also near impossible to remove.

See the photos below:

http://i137.photobucket.com/albums/q...0327-00375.jpg

http://i137.photobucket.com/albums/q...0327-00377.jpg

http://i137.photobucket.com/albums/q...0327-00376.jpg

I'm just trying to get the rest of the P/N to ensure the PCM is compatible with the SCT tuner.

Another option was, would the dealer know the exact PCM P/N for my Jeep if I give them a phone with the VIN number?


Thanks in advance! :thumbsup:

Frango100 03-27-2012 03:05 PM

Re: Removing the PCM
 
This is quite a different setup then i have on my 2004 jeep, so can't tell you how to remove it.
But with your VIN the dealer should be able to tell you which P/N PCM you have.

Martyp 03-27-2012 04:08 PM

Re: Removing the PCM
 
Probably doesn't help that mine is right hand drive either. TCM is squashed behind the PCM and that is preventing me getting to the two torqs holding it onto the bracket.

Gonna phone the dealer tomorrow so we'll see... :thumbsup:

01grand 03-27-2012 04:14 PM

Re: Removing the PCM
 
Quote:

Originally Posted by Martyp (Post 601787)
Probably doesn't help that mine is right hand drive either.

There is nothing cool about a right hand drive! :lol::lol::lol::slapfight::slapfight::slapfight:

And besides, 99-01 and all HO motors have the jtec PCM, the 02+ standard 4.7s have a different pcm. Thats why ours are different.

Frango100 03-27-2012 10:36 PM

Re: Removing the PCM
 
Quote:

Originally Posted by 01grand (Post 601792)
And besides, 99-01 and all HO motors have the jtec PCM, the 02+ standard 4.7s have a different pcm. Thats why ours are different.

My 2004 WG 4.7 is still JTEC. I was wondering where the magical letters "JTEC" where coming from, but its nothing more then "Jeep Truck Engine Controller":rolleyes:. One more myth busted:eek:.
But there are 2 types :PCM´s with integrated TCM (NGC PCM with 4 plugs) and the 2 separate units (PCM with 3 plugs). I don´t understand why my 2004 Jeep still has the 2 separate units:confused:

01grand 03-28-2012 08:26 AM

Re: Removing the PCM
 
Quote:

Originally Posted by Frango100 (Post 602091)
My 2004 WG 4.7 is still JTEC. I was wondering where the magical letters "JTEC" where coming from, but its nothing more then "Jeep Truck Engine Controller":rolleyes:. One more myth busted:eek:.
But there are 2 types :PCM´s with integrated TCM (NGC PCM with 4 plugs) and the 2 separate units (PCM with 3 plugs). I don´t understand why my 2004 Jeep still has the 2 separate units:confused:

Thats a good question, although I thought you had the HO so I was really confused. Maybe because its the euro build WG? But his would for sure be a WG too....:confused::confused:

And thanks for solving the JTEC acronym!

cheapjeep 03-28-2012 01:05 PM

Re: Removing the PCM
 
I don't know,I don't see anything that resembles a tcm on Marty's Jeep back there. If it has 4 separate plugs its the NGC (Next Generation Controller:D) How about that,huh? Frank got my wheels turning:lol:. '03 and '04 were weird years from what I'm starting to see. I think they just used what they could get in volume while doing the changeover. Too many discrepancies here in the states. I can just imagine on the exports. Here's some good info. http://books.google.com/books?ei=WUx...%20ngc&f=false Marty can you get to the bolts and just remove the whole bracket that holds the PCM off the firewall?

Martyp 03-28-2012 04:15 PM

Re: Removing the PCM
 
No, I can't get to the bolts that hold it onto the firewall as there is an extra bolt underneath the PCM and the wires don't budge to far.

Called the dealer and they can't give me an exact P/N, just need to hope it'll be okay - which it should be.

In photo 2, you can see a unit on the RHS of the PCM with a heatsink on top and one plug, I thought that was the TCM?

Frango100 03-28-2012 07:56 PM

Re: Removing the PCM
 
The unit on the firewall indeed looks as the TCM, mine has the same black round plug on it and the connector is fastened in the same way with a bolt in the center.

cheapjeep 03-28-2012 08:10 PM

Re: Removing the PCM
 
Ok I see the plug now but I don't know everything is different on that thing. Too shiny.Too much reflection. My eyes,my eyes!!!!:lol:

Frango100 03-28-2012 08:16 PM

Re: Removing the PCM
 
There are not many large connectors like the TCM connector under the hood. It has 60 pins, divided over 3 rows, and i think is the only one which is fastened by a bolt.

ashy22 04-16-2012 02:31 PM

Re: Removing the PCM
 
Quote:

Originally Posted by Martyp (Post 602577)
No, I can't get to the bolts that hold it onto the firewall as there is an extra bolt underneath the PCM and the wires don't budge to far.

Called the dealer and they can't give me an exact P/N, just need to hope it'll be okay - which it should be.

In photo 2, you can see a unit on the RHS of the PCM with a heatsink on top and one plug, I thought that was the TCM?

I have the same problem on my 2005 Hemi GC.
I cant read the serial number on the PCM because of the brackets.

Did the hand held SCT work?:)


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