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Thread: Inside the CM849B ECM

  1. #1
    Forum tyhee Site Admin 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.


    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.

    In The Garage:
    2014 Holden Cruze 2.0L Diesel, A6 (E20 ECM), 430Nm @2,500, (Highway 4.5L/100km : 52MPG), sweet apart from being FWD!
    1967 Cadillac Fleetwood 75 Sedan.
    1964 Cadillac Fleetwood (2010 L96/4L60E swap in progress).

  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
    Forum tyhee Site Admin GMPX's Avatar
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    No problem, a number of people had asked for something like it.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.

    In The Garage:
    2014 Holden Cruze 2.0L Diesel, A6 (E20 ECM), 430Nm @2,500, (Highway 4.5L/100km : 52MPG), sweet apart from being FWD!
    1967 Cadillac Fleetwood 75 Sedan.
    1964 Cadillac Fleetwood (2010 L96/4L60E swap in progress).

  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
    Forum tyhee Site Admin GMPX's Avatar
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    I can't remember if it was a MPC555 or 563, one of them anyway.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.

    In The Garage:
    2014 Holden Cruze 2.0L Diesel, A6 (E20 ECM), 430Nm @2,500, (Highway 4.5L/100km : 52MPG), sweet apart from being FWD!
    1967 Cadillac Fleetwood 75 Sedan.
    1964 Cadillac Fleetwood (2010 L96/4L60E swap in progress).

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