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no power at datalink port

Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckerbangin, Nov 29, 2018.

Page 1 of 3
  1. Nov 29, 2018 #1
    truckerbangin

    truckerbangin Light Load Member

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    Jan 22, 2013
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    95 intentional 9600 cab over with ddec iii 11.1 issue is (NO START)
    i am getting no power at datalink port so i cant connect to ecm to use diagnostic link the truck has new timing sensors, fuel pump and, ecm and the truck still will not start.

    how can i get power to DataLink port or does anybody have pin out of 6pin datalink port?
     
    truckerbangin, Nov 29, 2018
    truckerbangin, Nov 29, 2018
    #1
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  3. Nov 29, 2018 #2
    CousinVinny

    CousinVinny Medium Load Member

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    On a J1708 pin C is hot and E is ground.

    [​IMG]
     
    CousinVinny, Nov 29, 2018
    CousinVinny, Nov 29, 2018
    #2
    Danielfloydgarcia and truckerbangin Thank this.
  4. Nov 29, 2018 #3
    truckerbangin

    truckerbangin Light Load Member

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    if i supply 12v and a ground if needed i should be able to connect to the ecm if no J1708 wires are damaged right?
     
    truckerbangin, Nov 29, 2018
    truckerbangin, Nov 29, 2018
    #3
  5. Nov 29, 2018 #4
    AModelCat

    AModelCat Road Train Member

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    Maybe your ECM isn't getting power? Could explain the no power to the diagnostic port.
     
    AModelCat, Nov 29, 2018
    AModelCat, Nov 29, 2018
    #4
  7. Nov 29, 2018 #5
    uncleal13

    uncleal13 Road Train Member

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    Some trucks have a five amp fuse that supplies the data port
     
    uncleal13, Nov 29, 2018
    uncleal13, Nov 29, 2018
    #5
  8. Nov 29, 2018 #6
    truckerbangin

    truckerbangin Light Load Member

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    ecm power harness has power and grounds
     
    truckerbangin, Nov 29, 2018
    truckerbangin, Nov 29, 2018
    #6
  9. Nov 29, 2018 #7
    Heavyd

    Heavyd Road Train Member

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    The oldest book I have is for 98 and newer. F6-A shows it is the fuse for the datalink connector. 5 amp. If you turn the key on, you should get the yellow and red engine warning lights coming on for a bulb test. If they do not come on, the ECM is not booting.
     
    Heavyd, Nov 29, 2018
    Heavyd, Nov 29, 2018
    #7
    Accidental Trucker Thanks this.
  10. Nov 29, 2018 #8
    baha

    baha Road Train Member

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    Go to batt. box and look for fuse inside plastic fuse holder clean all batt. conn. an where the ecm fuse pushes into holder?
     
    baha, Nov 29, 2018
    baha, Nov 29, 2018
    #8
  11. Nov 30, 2018 #9
    truckerbangin

    truckerbangin Light Load Member

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    Jan 22, 2013
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    what would cause the ecm not to boot up?
     
    truckerbangin, Nov 30, 2018
    truckerbangin, Nov 30, 2018
    #9
  12. Nov 30, 2018 #10
    Heavyd

    Heavyd Road Train Member

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    ECM has constant battery power and grounds then is turned on separately by ignition power. So it could be losing any of those. ECM failure is the other possibility.
     
    Heavyd, Nov 30, 2018
    Heavyd, Nov 30, 2018
    #10
    truckerbangin Thanks this.
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