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2004 379 cruise control

Discussion in 'Peterbilt Forum' started by lobes1985, Jun 14, 2014.

  1. Jun 14, 2014 #1
    lobes1985

    lobes1985 Medium Load Member

    306
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    Aug 9, 2009
    Wappingers Falls, NY
    0
    04 379 just swapped a 6nz into it. Cruise worked before swap. Cat set parameters of ecm on new engine. Speedometer works, tach works, governor works so ecm is reading speed. High idle and cruise both do not work. No problems with jake brake so its not a clutch switch problem. I wouldn't think its a brake switch problem because it worked before swap. Where would I start looking for any problems?
     
    lobes1985, Jun 14, 2014
    lobes1985, Jun 14, 2014
    #1
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  3. Jun 14, 2014 #2
    wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    I know CAT set up ECM but they may have left it off. Also check for power and ground at switches with a multimeter not a test light. Check all engine and harness grounds of course. With it being high idle and cruise it points to either brake switch or power/ground problem to switches or ECM. Cruise parameters in ECM could be too.
     
    wore out, Jun 14, 2014
    wore out, Jun 14, 2014
    #2
    lobes1985 Thanks this.
  4. Jun 14, 2014 #3
    lobes1985

    lobes1985 Medium Load Member

    306
    112
    Aug 9, 2009
    Wappingers Falls, NY
    0
    Im thinking power and ground issues. I have the print out of what cat did on the ecm and the cruise is on with the correct high and low speeds. Im going to test the switch today or tomorrow and see if it is getting power.
     
    lobes1985, Jun 14, 2014
    lobes1985, Jun 14, 2014
    #3
  5. Jun 16, 2014 #4
    GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Try pulling flash codes, cruise off, then hold Accel or Resume for a second. If you get a flash code 55, then you know that the cruise switches are working. If not, then look at the switches and wiring.
     
    GrapeApe, Jun 16, 2014
    GrapeApe, Jun 16, 2014
    #4
    lobes1985 Thanks this.
  7. Jun 16, 2014 #5
    lobes1985

    lobes1985 Medium Load Member

    306
    112
    Aug 9, 2009
    Wappingers Falls, NY
    0
    That's a great idea, didn't even think about doing it that way
     
    lobes1985, Jun 16, 2014
    lobes1985, Jun 16, 2014
    #5
  8. Jun 14, 2018 #7
    Johnny03pete379

    Johnny03pete379 Bobtail Member

    1
    0
    Jun 14, 2018
    0
    Cruise and Jakes weren' working till I read this post. Tried pulling up on the clutch pettle and it has enough slop that it kicks cruise off. Guess I need to find the switch and adjust it.
     
    Johnny03pete379, Jun 14, 2018
    Johnny03pete379, Jun 14, 2018
    #7
  9. Jun 25, 2019 #8
    Halfman

    Halfman Bobtail Member

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    Apr 13, 2019
    0
    Is the switch supposed to be made or not made
     
    Halfman, Jun 25, 2019
    Halfman, Jun 25, 2019
    #8
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