Datalink Issue

Discussion in 'Volvo Forum' started by Damage, Jan 13, 2012.

  1. Damage

    Damage Light Load Member

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    Jan 13, 2012
    Newark, Nj
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    I am trying to track down an active datalink problem with a 07 Volvo VN daycab with an eaton autoshift. I have checked several of the 1939 connections already, but before I go any further. I was wondering if there are any known troublespots in these tractors harness that causes the datalink issue. As a sidenote, it is active and one of its symptoms is when you turn the key off, it takes about 10 seconds for the engine to actually shut down. Also all of the ECMs on the tractor (ABS, Engine ECU, trans ECU and vehicle ECU) are responding to commands from the laptop and the onboard diagnostics.

    Any help will be appreciated. Thanks
     
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  3. Pablo-UA

    Pablo-UA Road Train Member

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    Volvo calls J1708 datalink (400-401 wires)

    J1939 is called CAN
     
  4. T-Rex Monster truck

    T-Rex Monster truck Bobtail Member

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    Jan 6, 2012
    menahga, mn
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    Any photos of these wires and connector, this is the same as you were saying on my post? Thanks again, Chad
     
  5. Pablo-UA

    Pablo-UA Road Train Member

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    MCFC connector (cab to chassis), find 400-401 twisted pair.

    What diagnostic adapter do you use?
     
  6. Damage

    Damage Light Load Member

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    Jan 13, 2012
    Newark, Nj
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    This may be so on some volvo models, but not all. Both the onboard and laptop are both saying the code is Datalink/J1939.

    In addition a failed 1708/1587 wouldnt cause problems like I am having. It simply doesnt have control over what is happening. I am sure it is a 1939 failure. I am really just needing any possible help with any trouble spots in the 1939 harness. Thanks for any input.
     
  7. Duramaxxed

    Duramaxxed Light Load Member

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    Jan 2, 2012
    Bourbonnais, IL
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    Trouble spots, sure. Green and yellow twisted pair wires, run in from the firewall. I've seen alot of failures where the wires run over the steering column up into the fuse panel area. The datalink terminating resistor is up near the fuse panel, under the fuse panel is where all the modules are. Check all the wiring between them. Pin drag and whatnot in all the connectors. That's where I usually find problems w/ datalink on volvo's I see.
     
    Damage and Snailexpress Thank this.
  8. Pablo-UA

    Pablo-UA Road Train Member

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    Green and yellow datalink and gray and orange J1939 CAN are European can marking, also used are blue and yellow (generally mercedes and DAF J1939). Yep, on some US versions Volvo used European markong, but from '99 Volvo uses black wires with figues in the USA and AU. so J1708 is 400-401 marked.

    In EU Volvo use AMP connectors only, in the use AMP and Deutch
     
  9. Damage

    Damage Light Load Member

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    Jan 13, 2012
    Newark, Nj
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    Thanks for the help. I ended up finding a broken wire on the drivers floorboard. It was for the shifter. It is connected through 1939. Thanks for your ideas. I hope if anyone else runs into a problem like this, this might help.
     
    Last edited: Jan 17, 2012
  10. Pablo-UA

    Pablo-UA Road Train Member

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    are wires were color marked? like on Volvo Cabovers?
     
  11. Damage

    Damage Light Load Member

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    Jan 13, 2012
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    The broken wire was the green wire from the green/yellow twisted pair. The other wires in the harness were all black, but are numbered like the rest of the tractor.
     
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