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GMPX
September 6th, 2011, 12:49 PM
Ever wondered what the inside of the 2006-2007 Cummins CM849B ECM looks like?
To get the ECM opened up like the picture below pretty much renders the ECM useless because of the way the case is wrapped around a frame (not shown), the case ends up looks like it's been run over by a bus (so don't try this on your own ECM).

The main sections of the ECM are shown in the picture below.
1 - This is the Injector drive circuit with the big green charge capacitors clearly visible.
2 - The C1 & C2 connectors underside.
3 - The 'brain' section of the ECM with the CPU, Flash memory and RAM.

The CPU is from the popular Freescale PowerPC (http://en.wikipedia.org/wiki/PowerPC) range, this CPU is used in many ECM's from GM, FORD and Chrysler, to many European cars. The PowerPC CPU core was also once used in Mac's and numerous gaming consoles (Xbox360, PS3, Wii).
Cummins first started using the PowerPC processor as far back as the 2003 model ECM's (CM846), which was years ahead of most other manufacturers (Delphi, Visteon, Bosch) switching to these CPU's for their controllers.
Notice there is no solid PCB as such, everything is mounted on a flexible type PCB, making component level repairs almost impossible.


http://download.efilive.com/Software/Images/CM849B_Internal2.jpg

Dmaxink
September 6th, 2011, 01:21 PM
That's super cool! Glad you posted this

GMPX
September 6th, 2011, 01:23 PM
No problem, a number of people had asked for something like it.

joecar
September 6th, 2011, 01:53 PM
Very interesting, flex film PCB.

dsltnr
October 3rd, 2011, 02:33 AM
Is this a Motorola MPC555 processor

chance cobb
October 3rd, 2011, 02:50 PM
cool

GMPX
October 3rd, 2011, 03:28 PM
I can't remember if it was a MPC555 or 563, one of them anyway.

SASDakota
August 10th, 2015, 07:33 AM
Any chance of doing this for the newer CM2200 and CM2350?

GMPX
August 10th, 2015, 08:45 AM
Sure, might not be as detailed but I have a few bricked ones that I can pull apart.

GMC-2002-Dmax
August 10th, 2015, 08:55 AM
Is there a reason to pull it apart Ross, or was it making you mad and you decided that you will gut it just because, LOL

Interesting to see that all that makes a vehicle run

SASDakota
August 10th, 2015, 09:57 AM
Is there a reason to pull it apart Ross, or was it making you mad and you decided that you will gut it just because, LOL

Interesting to see that all that makes a vehicle run

Maybe he tried to flash this one and it said "PC load letter" so he went office space on it! :Eyecrazy::throw:

WyoFreeride
August 10th, 2015, 11:51 PM
That would be cool. The engineer in me wants to take everything apart and see whats inside...

GMPX
August 11th, 2015, 08:56 AM
I think it was a bricked one, because once you prise them open I doubt it could ever be sealed back up again, there is a lot of force and bending involved.