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Thread: Inside the CM849B ECM

  1. #1
    Lifetime Member GMPX's Avatar
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    Default Inside the CM849B ECM

    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 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.


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  2. #2
    Lifetime Member Dmaxink's Avatar
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    That's super cool! Glad you posted this
    -Kory

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

    http://www.PPEI.com/

  3. #3
    Lifetime Member GMPX's Avatar
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    No problem, a number of people had asked for something like it.
    I no longer monitor the forum, please either post your question or create a support ticket.

  4. #4
    Joe (Moderator) joecar's Avatar
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    Very interesting, flex film PCB.

  5. #5
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    Is this a Motorola MPC555 processor

  6. #6
    Junior Member chance cobb's Avatar
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    cool

  7. #7
    Lifetime Member GMPX's Avatar
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    I can't remember if it was a MPC555 or 563, one of them anyway.
    I no longer monitor the forum, please either post your question or create a support ticket.

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    Any chance of doing this for the newer CM2200 and CM2350?

  9. #9
    Lifetime Member GMPX's Avatar
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    Sure, might not be as detailed but I have a few bricked ones that I can pull apart.
    I no longer monitor the forum, please either post your question or create a support ticket.

  10. #10
    Lifetime Member GMC-2002-Dmax's Avatar
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    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
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


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