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Thermo King APU gives ENG right when you turn it on.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by joseph1135, Oct 22, 2013.

  1. Oct 22, 2013 #1
    joseph1135

    joseph1135 Papa Murphy

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    The Highway To Hell.
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    I don't know if this is in the right section so mods please feel free to move my dumb ### in the right direction!!! Ha ha! Anyway, I am having an issue with a Thermo King TriPac. It's a DPF version, but that is not the issue, thought I'd give more info. Problem is, when I turn it on, if I turn the APU button on, it immediately goes to the ENG code. It will not even attempt to crank. This started when I got a service on the truck. I checked the switch on the unit, the breaker, and the DPF switch up front to make sure all were on. They are. I went to the back of bunk and checked all wires to make sure everything was connected. They are. The only thing I could find was that the water lines were turned off, and I turned those back on. I've looked high and low for this, even making sure the batteries were properly connected. Now, when the APU goes to ENG, and I shut it off, the temp goes to 70, which means it reset itself. Could this be directly in the APU's alternator? Or maybe something in the board itself? Thanx for any help you guys can give me!

    BTW, heat still works and I can control it from control panel (it does have the webasto heater). I know its a seperate unit, but what could make the APU not even crank? Thanx again guys.
     
    joseph1135, Oct 22, 2013
    joseph1135, Oct 22, 2013
    #1
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  3. Oct 22, 2013 #2
    Al^*

    Al^* Light Load Member

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    The Eng code means that the APU run circuit is energized by the controller board but the run relay is not energized, which could be caused by a tripped reset switch (under bunk), blown fuse (F8 under bunk), engine switch off (APU engine compartment) or DPF shutdown. I'm not very familiar with the DPF part of the circuit since I don't have a DPF , but that's everything in that circuit that could cause the Eng code other than a loose connection or broken wire.

    You said you already checked the engine switch, I'd check the reset switch next (under bunk), make sure the DPF regen switch is on, and check fuse F8 (under bunk). I'm not sure where the DPF regen switch would be, but I'd guess in the engine compartment. Maybe someone else can help there.

    Also, after you fix the problem, the controller in the sleeper has to be turned off and back on to reset the Eng code.
     
    Al^*, Oct 22, 2013
    Al^*, Oct 22, 2013
    #2
    Skwhirl, KB3MMX and deming807 Thank this.
  4. Oct 23, 2013 #3
    Hardlyevr

    Hardlyevr Road Train Member

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    I would check all of the fuses that are outside of the box in the bunk. If the engine fan fuse is blown, it will keep the unit from starting too.
     
    Hardlyevr, Oct 23, 2013
    Hardlyevr, Oct 23, 2013
    #3
  6. May 21, 2017 #5
    Idlpc98

    Idlpc98 Bobtail Member

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    May 21, 2017
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    Where I can find the engine fan fuse?
     
    Idlpc98, May 21, 2017
    Idlpc98, May 21, 2017
    #5
  8. Jul 9, 2019 #5
    Intothesunset

    Intothesunset Road Train Member

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    2019 TK evolution dpf model. I am having this issue right now. Red triangle with engine lights up.
    This junk is almost new still with 19,000 miles on truck.
     
    Intothesunset, Jul 9, 2019
    Intothesunset, Jul 9, 2019
    #5
  9. Sep 5, 2019 #6
    Zayah

    Zayah Bobtail Member

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    Bump. Same problem. Any resolutions or help?
     
    Zayah, Sep 5, 2019
    Zayah, Sep 5, 2019
    #6
  10. Sep 6, 2019 #7
    mitmaks

    mitmaks Road Train Member

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    Check on/off engine switch. Mine was bad and it would not even try starting.
     
    mitmaks, Sep 6, 2019
    mitmaks, Sep 6, 2019
    #7
    Zayah Thanks this.
  11. Sep 6, 2019 #8
    Zayah

    Zayah Bobtail Member

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    Jul 17, 2019
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    Mine was bad as well. I jumped it together and still will not crank.
     
    Zayah, Sep 6, 2019
    Zayah, Sep 6, 2019
    #8
  12. Sep 6, 2019 #9
    mitmaks

    mitmaks Road Train Member

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    Check big 50amp fuse on top of apu
     
    mitmaks, Sep 6, 2019
    mitmaks, Sep 6, 2019
    #9
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