2014 t800 electrical issues. Isx15

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kmils09, Dec 1, 2020.

  1. Kmils09

    Kmils09 Bobtail Member

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    Good afternoon all! So I’m here to hopefully get some help on one of my trucks. Driver came back with a whole book of active after treatment codes. Come to find out the 10a acm fuse is blown. Fuse blows immediately with key on. I’m not good with Cummins and wondering if anyone has a good starting point for this. Thank you!!!
     
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  3. Kmils09

    Kmils09 Bobtail Member

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    Jun 17, 2018
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    I will add to this. Ive gone through and unplugged each bank of aftertreatment sensors and the fuse still blows. Also disconnected the entire harness on the dpf/scr assembly, same result. I am not sure where the acm is on this truck. I wonder if that could be the issue.
     
  4. Goodysnap

    Goodysnap Road Train Member

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    Aftertreatment ECU is internal to the Engine ECM. Parts do not often blow fuses. You most likely have a sensor power supply shorted to ground.

    Pay close attention in the DPF/SCR box and the Foil wrapped harness. There are metal ties that secure the harness to the DPF/SCR. Over time vibration will wear the metal tie through the foil and rub the wires. This is where I would go first. Otherwise is break out schematics and start isolating a short to ground.

    Hope for an easy find. Good luck
     
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  5. Kmils09

    Kmils09 Bobtail Member

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    Thanks for the help! I guess I’ll pull up the Cummins schematic.
     
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  6. Goodysnap

    Goodysnap Road Train Member

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    You are gonna need KW schematics as Cummins side will be generic to the aftertreatment components for all OEMs
     
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  7. Inderjit

    Inderjit Light Load Member

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    If it is a CM2250 it will have a ACM separate from the engine ECM.
    It can be mounted just about anywhere.
    A dealer should be able to tell you where to find it.
    I would suspect a wire rubbed through shorting to ground.
     
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  8. Kmils09

    Kmils09 Bobtail Member

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    My mistake as that fuse was not labeled acm. It was labeled aftertreatment power. D12 10a.
     
  9. Kmils09

    Kmils09 Bobtail Member

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    Its a cm2350
     
  10. Inderjit

    Inderjit Light Load Member

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    I just finished repairing an electrical problem on a CM2250 in a Volvo.
    The ACM was mounted on the front of the DEF tank behind the fuel tank.
    A really tight space to work on and find and repair a broken wire.
     
  11. Kmils09

    Kmils09 Bobtail Member

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    Jun 17, 2018
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    So heres where im at. Dont have a diagram so i started following wires. The fuse thats blowing is D12 labeled aftertreatment power. That harness splits off and goes to the ecm bottom plug and into the cab, if that harness is unplugged the fuse does not blow. The wire that goes to D12 does not go into that section of harness. The wire is ORN3250-0. I guess without a proper diagram this is going to be pretty difficult. Thanks for the help.
     
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