02 Peterbilt 379 won't start.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by n1xrf, Apr 16, 2016.

  1. n1xrf

    n1xrf Light Load Member

    166
    32
    Jul 18, 2011
    somewhere in the USA
    0
    02 Peterbilt 378, with a 6nz cat. Ran great, pulled into the yard, driver said it had a bad battery. Had the parts changer change battery, now the truck won't start. Has plenty of fuel, primer is hard, filter is full. Have 12v power on ecm pin 70, with key on. Has constant 12v on 3 exam pins with key off. Still won't run. Any ideas?
     
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  3. baha

    baha Road Train Member

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    CK. to be sure ecm is still getting 12v, will it start for a short time on ether? the sensor L side ft.above air comp. will make E model not start and not throw a code,
     
  4. TAfool

    TAfool Medium Load Member

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    Dec 8, 2012
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    Cranks, won't start?
    or
    Won't crank?

    Check obvious first. Did all ground and power leads get reconnected?

    TA
     
  5. n1xrf

    n1xrf Light Load Member

    166
    32
    Jul 18, 2011
    somewhere in the USA
    0
    Cranks, but no start. All wires are hooked up properly. Will hit on ether.
     
  6. n1xrf

    n1xrf Light Load Member

    166
    32
    Jul 18, 2011
    somewhere in the USA
    0
    I forgot to mention, it also won't talk to my nexus iq scan tool. Can talk to abs and trailer abs modules.
     
  7. Old school 362

    Old school 362 Medium Load Member

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    Mar 6, 2016
    Pensacola Fl
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    Check elm ground wire. Located next to battery box. Should be a white wire. My .o2
     
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  8. wore out

    wore out Numbered Classic

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    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    If it will not communicate with the nexius tgere is a power or ground wire off or in the wrong place on the battery cables. Hopefully a positive on a ground and not the other way around
     
    n1xrf Thanks this.
  9. Old school 362

    Old school 362 Medium Load Member

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    Mar 6, 2016
    Pensacola Fl
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  10. n1xrf

    n1xrf Light Load Member

    166
    32
    Jul 18, 2011
    somewhere in the USA
    0
  11. Old school 362

    Old school 362 Medium Load Member

    392
    249
    Mar 6, 2016
    Pensacola Fl
    0
    Hace u checked fuel pump for pressure.
     
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