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Durastar 4400 maxxforce 9 voltage disappears at scanner

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Wannabe tech, Jan 18, 2019.

  1. Jan 18, 2019 #1
    Wannabe tech

    Wannabe tech Light Load Member

    121
    96
    Jan 2, 2019
    0
    Ok guys this is a 2014 4400 maxxforce 9, ive been stumped on this one for 3 weeks.

    Issue, voltage disappers at scanner, all the aftertrearment numbers make no sense what so ever, the truck throttles up and down while running.

    I unplug the ACM module and all my issues go away. I want to suspect the ACM because its mounted in a bad spot, but from what i read on here they never go bad.

    I checked for voltage at the ACM everything is fine.... need help making the next move, i think maybe data link issues ...
     
    Wannabe tech, Jan 18, 2019
    Wannabe tech, Jan 18, 2019
    #1
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  3. Jan 19, 2019 #2
    FlyingA

    FlyingA Bobtail Member

    46
    23
    Jun 3, 2018
    Sacramento, Ca
    0
    Check wiring harness from sensors to ACM. Also check for issues from ACM to ECM. Just because it is said the ACM doesn’t go haywire doesn’t mean that it won’t. Have had fail proof parts fail in past and argued with lead parts changer over that kind of thinking. Good Luck
     
    FlyingA, Jan 19, 2019
    FlyingA, Jan 19, 2019
    #2
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