Need help finding OBD port on 1993-378

Discussion in 'Peterbilt Forum' started by KOONERCAT, Aug 20, 2011.

  1. Aug 20, 2011 #1
    KOONERCAT

    KOONERCAT Bobtail Member

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    Aug 20, 2011
    SNOW SHOE, PA
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    We can't locate the OBD port on a 1993 378 Pete tractor with a Cat motor. It is not under the dash or near the starter as we thought it would be. We have had the truck for awhile but just got a Blue Point scanner. Thanks in advance.
     
    KOONERCAT, Aug 20, 2011
    KOONERCAT, Aug 20, 2011
    #1
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  3. Aug 20, 2011 #2
    Dutch

    Dutch Light Load Member

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    Commiefornia
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    they dont have OBD. Sometimes they were under the dash on the d/s 6 pin deutsch, or they were located on the engine d/s when they had ECAP 9 pin deutsch
     
    Dutch, Aug 20, 2011
    Dutch, Aug 20, 2011
    #2
  4. Aug 20, 2011 #3
    KOONERCAT

    KOONERCAT Bobtail Member

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    Aug 20, 2011
    SNOW SHOE, PA
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    Thanks Dutch,
    It doesn't seem to have a 6 or 9 pin in either place.
    The old girl is going to Cat on Tuesday, we just wanted to see what our scanner showed before we took it in.
     
    KOONERCAT, Aug 20, 2011
    KOONERCAT, Aug 20, 2011
    #3
  5. Aug 21, 2011 #4
    spax

    spax Medium Load Member

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    What motor do you have (specifically)?
     
    spax, Aug 21, 2011
    spax, Aug 21, 2011
    #4
  7. Aug 21, 2011 #5
    KOONERCAT

    KOONERCAT Bobtail Member

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    SNOW SHOE, PA
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    Cat 3406...........
     
    KOONERCAT, Aug 21, 2011
    KOONERCAT, Aug 21, 2011
    #5
  8. Aug 21, 2011 #6
    spax

    spax Medium Load Member

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    That isn't very specific. Is it a peec engine?
     
    spax, Aug 21, 2011
    spax, Aug 21, 2011
    #6
  9. Aug 22, 2011 #7
    KOONERCAT

    KOONERCAT Bobtail Member

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    SNOW SHOE, PA
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    I don't know for sure, but I will find out.
    It is original to this truck with at least one rebuild on it.
    I have much to learn about and I thank you all for your patience.
     
    KOONERCAT, Aug 22, 2011
    KOONERCAT, Aug 22, 2011
    #7
  10. Aug 22, 2011 #8
    KOONERCAT

    KOONERCAT Bobtail Member

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    Aug 20, 2011
    SNOW SHOE, PA
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    The boss tells me it is a PEEC.
     
    KOONERCAT, Aug 22, 2011
    KOONERCAT, Aug 22, 2011
    #8
  11. Aug 23, 2011 #9
    spax

    spax Medium Load Member

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    The only diagnostic port will be under the hood around the ecm, probably right on top. It will roughly be the size of one of those old film containers, with a little cap that screws off to expose the plug. Those have to be read by an ecap machine.
     
    spax, Aug 23, 2011
    spax, Aug 23, 2011
    #9
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