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Can ECM diagnostics be ran with it off the truck

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Dec 26, 2023.

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  1. Dec 26, 2023 #1
    mile marker 27

    mile marker 27 Road Train Member

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    The 2 local guys that can test my DDEC2, said they’re 2-3 weeks out, of being able to check my truck. I called a place that rebuilds ECM’s in SIL and the woman who answers the phone for them, seems to think they can. If so, it be relatively easy for me to unplug and unbolt.
     
    mile marker 27, Dec 26, 2023
    mile marker 27, Dec 26, 2023
    #1
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  3. Dec 26, 2023 #2
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    kemosabi49, Dec 26, 2023
    kemosabi49, Dec 26, 2023
    #2
  4. Dec 26, 2023 #3
    MRMTRANS

    MRMTRANS Medium Load Member

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    Well, I imagine it depends upon who is plugging in. Pittsburgh Power can reprogram a computer out if the truck. But their remote tuners have to have the ecm in the truck, as if they only have a truck's diagnostic port for their computer.
     
    MRMTRANS, Dec 26, 2023
    MRMTRANS, Dec 26, 2023
    #3
  5. Dec 26, 2023 #4
    MRMTRANS

    MRMTRANS Medium Load Member

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    I am guessing to examine and test the ecm for problems, it would just about need to be out of the truck, however.
     
    MRMTRANS, Dec 26, 2023
    MRMTRANS, Dec 26, 2023
    #4
  7. Dec 26, 2023 #5
    Iamoverit

    Iamoverit Road Train Member

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    What exactly are you looking to do?
     
    Iamoverit, Dec 26, 2023
    Iamoverit, Dec 26, 2023
    #5
  8. Dec 26, 2023 #6
    mile marker 27

    mile marker 27 Road Train Member

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    The truck is basically in “limp” mode because after a couple minutes of initial driving, it limits its rpm’s to 1,800. The truck has a speed limiter as well. I’ve changed the cam and crank sensor, checked grounds and checked fuses in the battery box. Im not a 100% sure but I think it’s in the ECM.
     
    mile marker 27, Dec 26, 2023
    mile marker 27, Dec 26, 2023
    #6
  9. Dec 26, 2023 #7
    mile marker 27

    mile marker 27 Road Train Member

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    One local guy that I talked to, wants to test it but seems quick to want to change it over to a DDEC4. I’m kinda reluctant to do that, with it running fine, aside from the max rpm of 1800.
     
    mile marker 27, Dec 26, 2023
    mile marker 27, Dec 26, 2023
    #7
  10. Dec 26, 2023 #8
    Iamoverit

    Iamoverit Road Train Member

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    Sounds like you need someone to plug in take a look around for anything abnormal. I would try that before sending it out somewhere. Bad ECMs are not as common as many people think.

    They're misdiagnosed often and they aren't cheap. Maybe try to find a used one somewhere to use as a tester. You could very well end up spending a bunch of money for nothing or worse yet, losing the ECM in the shipping process.
     
    Iamoverit, Dec 26, 2023
    Iamoverit, Dec 26, 2023
    #8
    AModelCat and mile marker 27 Thank this.
  11. Dec 26, 2023 #9
    mile marker 27

    mile marker 27 Road Train Member

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    IMG_4823.jpeg Got a hold of a guy who’s gonna plug it up this evening or tomorrow. My plug is evidently the old style DDEC2. The newer one is round. Guy said it could be as simple as a fuel temp, boost, ………. sensor.
     
    mile marker 27, Dec 26, 2023
    mile marker 27, Dec 26, 2023
    #9
    Iamoverit Thanks this.
  12. Dec 26, 2023 #10
    Iamoverit

    Iamoverit Road Train Member

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    Exactly. Abnormal sensor data or nonworking sensors will be pretty obvious once he looks st it. I'd hate to see you pay a bunch of money for nothing or lose the ECM altogether. Let us know what it was when you figure it out.
     
    Iamoverit, Dec 26, 2023
    Iamoverit, Dec 26, 2023
    #10
    mile marker 27 Thanks this.
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