2007 Freightliner Columbia J1939 terminating resister location?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Hulld, Jun 1, 2020.

  1. Hulld

    Hulld Road Train Member

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    Anyone have any idea of the location?
    I am having intermittent eld connection issues.
    The truck runs fine no lights and no issues but I figured I would start to look there first.
     
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  3. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Going to have one zip tied to air lines going into foot valve. Other one is behind dash. Wires tend to corrode under kick plate to kick panel. Easy to check.
     
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  4. Hulld

    Hulld Road Train Member

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  5. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Yes. Orange/green twisted is j1708. You will have j1939 green/yellow twisted somewhere.
     
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  6. Hulld

    Hulld Road Train Member

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    Interesting
    Do you have any idea where the j1939 twisted gree/yellow would be?
    I checked out the bunched air lines bY the the foot valve but didn’t find a twisted green/ yellow or a terminating resistor?
     
  7. Hulld

    Hulld Road Train Member

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    9D56D245-D00D-4733-A2FA-E0CCF92750B4.jpeg 16FB55C3-2905-4EB2-961E-29E09A53784B.jpeg
    this is what my diag connector looks like.
    It has a twisted green/orange and Yellow full time power and a yellow ground that connects to the j1708 block by the door jamb.
    I do see the twist green /orange pair also run back to the ECM on the side of the engine.
    Does this set up not use the twisted yellow/green backbone with the terminating resistors?
     
  8. QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Follow the harness that that comes out of firewall on driver side. Large round plug above foot valve. You may have to dig through harness and cut a bunch of zip ties, but you will find a resistor right there right around frame rail. Make sure that you don't have an old qualcomm cable hanging off back of cab with bunch of corroded pins.
     
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  9. Hulld

    Hulld Road Train Member

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    I see the round aluminum connector by the foot valve but it only has yellow wires and one twisted pair of green/orange wires that run back to the ECM on the engine.
    Shouldn’t I see a pair of twisted green/ yellow ( backbone) wires at this connector?
    Also my test information says it should read 60 ohms at pin c and D at the diag plug.
    Mine doesn’t even have any pins in C Or D on my diag plug?
     
  10. Hulld

    Hulld Road Train Member

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    So thru my research I have determined that my truck (2007 Freightliner Columbia) has a J1939 plug but uses the J1708 protocol only so no terminating resistors or backbone I guess...
     
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