Replacing transmission harness on 2006 Freightliner

Discussion in 'Freightliner Forum' started by Verdel, May 5, 2017.

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  1. May 5, 2017 #1
    Verdel

    Verdel Medium Load Member

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    2006 Freightliner Columbia with Eaton 3 pedal auto shift.
    I have a bad TCU harness. The one that goes from TCU to battery box and the other one from TCU to ECU.

    Do I need to take down the driver's side fuel tank in order to get access to the harness or there is some other way?
     
    Verdel, May 5, 2017
    Verdel, May 5, 2017
    #1
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  3. May 5, 2017 #2
    FLHT

    FLHT Road Train Member

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    Still have the plate in the floor ? If so that is the way to get to all the wiring.
    How many miles on the truck ?
    Check and clean all your grounds before you spend any money !
     
    FLHT, May 5, 2017
    FLHT, May 5, 2017
    #2
    Verdel Thanks this.
  4. May 5, 2017 #3
    Verdel

    Verdel Medium Load Member

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    I already replaced the X-Y shifter by removing this plate, but to get to the TCU, which is mounted on the left side of the gear box, I need access on the left side....truck is now 950 000 miles....

    The code 17 for bad harness, I got by checking with Service ranger 4.0.....
     
    Verdel, May 5, 2017
    Verdel, May 5, 2017
    #3
  5. May 5, 2017 #4
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    Just remove plate for easy access to harness. Attached with many zip ties, so have good cutters ready.
     
    QUALITYTRUCK, May 5, 2017
    QUALITYTRUCK, May 5, 2017
    #4
    Verdel Thanks this.
  7. May 5, 2017 #5
    Verdel

    Verdel Medium Load Member

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    From the hole on the floor, you can only replace the top harness of the x-y shifter...
     
    Verdel, May 5, 2017
    Verdel, May 5, 2017
    #5
  8. May 5, 2017 #6
    FLHT

    FLHT Road Train Member

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    TCU wires come off from hole in floor. TCU unbolts from under left side and comes out from above.
     
    FLHT, May 5, 2017
    FLHT, May 5, 2017
    #6
  9. May 5, 2017 #7
    FLHT

    FLHT Road Train Member

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    Just wondering what are your transmission issues ?
    I learned that all the wiring and transmission parts are the same regardless of truck manufacture.
     
    FLHT, May 5, 2017
    FLHT, May 5, 2017
    #7
  10. May 6, 2017 #8
    Verdel

    Verdel Medium Load Member

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    Hesitating when engaging into a gear....
     
    Verdel, May 6, 2017
    Verdel, May 6, 2017
    #8
  11. May 6, 2017 #9
    FLHT

    FLHT Road Train Member

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    Mine started out like it was lost and did not know what gear to go to up or down. When it was wet out it was even worse. Then started to drop out of gear as I was moving this problem is very common but few have any idea as to how to fix it. The dealers have no clue and just replace everything and hope it works.
    Replaced all the sensors first their cheap and easy
     
    FLHT, May 6, 2017
    FLHT, May 6, 2017
    #9
    Verdel Thanks this.
  12. May 6, 2017 #10
    Verdel

    Verdel Medium Load Member

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    Hi, I will just change the whole harness and see what is going on,,,
     
    Verdel, May 6, 2017
    Verdel, May 6, 2017
    #10
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