2007 International 9400i cummins isx

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Joe B2, Mar 14, 2021.

  1. Joe B2

    Joe B2 Bobtail Member

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    To all, I have a fault code 434which is lost unswitched power to ECM. If you name it i have done it !!!!!!!!!!!!!
    any off the wall ideas would be great..Thanks
     
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  3. Joe B2

    Joe B2 Bobtail Member

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    Mar 14, 2021
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    Also left off it comes and goes. Its like i have a gremlin!!!!!!!!!!
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    You need to name what you have done.
     
  5. Joe B2

    Joe B2 Bobtail Member

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    3 ECM’s new ground wires, new positive wires, new batteries, new wiring harness on international side of ecm. Cleaned all ground lugs. The only thing left to try that I know is disconnect my ELD.
     
  6. Hulld

    Hulld Road Train Member

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    Is the engine light on?
    Does it affect the way it runs?
    Are there any other codes logged?
    In the automotive world many manufacturers log loss of un switched power when ever the battery is disconnected or goes dead.
    The code is in active and resets on its own with a programmed specified number of key on run cycles.
    Not sure if it’s the same in the heavy truck systems?
     
  7. Joe B2

    Joe B2 Bobtail Member

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    Mar 14, 2021
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  8. Joe B2

    Joe B2 Bobtail Member

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    Mar 14, 2021
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    Truck shuts down for a second then turns back on. Yes it logs a 434 fault code. Then the code goes in active after you cycle key switch.
     
    Hulld Thanks this.
  9. Hulld

    Hulld Road Train Member

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    How frequently does this occur?
     
  10. Joe B2

    Joe B2 Bobtail Member

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    It’s very random. Basically when ever it feels like it!!!!!
     
  11. Hulld

    Hulld Road Train Member

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    Does just the engine shut down?
    Or do you lose power to the entire truck?
     
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