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Apu stop working

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 7seriestv, May 26, 2019.

  1. May 26, 2019 #1
    7seriestv

    7seriestv Light Load Member

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    Jan 28, 2016
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    I just got this truck Monday with a tripac apu. It work fine until Thursday, it was running then the red system fault light come and it shut down. The code is AL and a symbol look like an upside down F. 20190524_140736.jpg

    The oil level is good,I check the ground on the alternator, it was slack and I tightened it, then I press the reset switch and it still doing the samething. It will run for about 5 mins then the code come up and it shut down.
     
    7seriestv, May 26, 2019
    7seriestv, May 26, 2019
    #1
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  3. May 26, 2019 #2
    bzinger

    bzinger Road Train Member

    16,227
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    Dec 10, 2014
    omaha , ne
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    Was the cooling system recently opened up for a repair ?
    If so this can introduce an air pocket which needs to be bled at the apu .
     
    bzinger, May 26, 2019
    bzinger, May 26, 2019
    #2
  4. May 26, 2019 #3
    mhyn

    mhyn Road Train Member

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    Dec 29, 2008
    Northridge, CA
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    you need new alternator.
     
    mhyn, May 26, 2019
    mhyn, May 26, 2019
    #3
    7seriestv Thanks this.
  5. May 27, 2019 #4
    062

    062 Road Train Member

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    Actually there are a few things that can cause this.
    You need to check the voltage at the alternator first. If that’s good, then go to the box under the bunk and check the voltage on the sense wire. It should be labeled Sen. this was the problem with my apu. The sense wire was broken. You can run a new wire or make a jumper and tap off the lug beside the sen lug.
     
    062, May 27, 2019
    062, May 27, 2019
    #4
    7seriestv, PE_T and mhyn Thank this.
  7. May 28, 2019 #5
    Rholl

    Rholl Bobtail Member

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    May 28, 2019
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    Need to read the codes
     
    Rholl, May 28, 2019
    Rholl, May 28, 2019
    #5
    7seriestv Thanks this.
  8. May 28, 2019 #6
    lilillill

    lilillill Sarcasm... it's not just for breakfast

    5,642
    13,468
    Nov 7, 2007
    Possum Booger, Alabama
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    A1AB6BC5-83FC-428B-B50E-886CD9775D7C.jpeg 13CB9013-A756-4C14-A8D2-DDBC75CC88D1.jpeg BC04F1EC-79D4-40E6-A902-1E66A1D79B12.jpeg
     
    lilillill, May 28, 2019
    lilillill, May 28, 2019
    #6
    7seriestv, mhyn and 062 Thank this.
  9. May 30, 2019 #7
    7seriestv

    7seriestv Light Load Member

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    I will check that out, thanks for the information
     
    7seriestv, May 30, 2019
    7seriestv, May 30, 2019
    #7
  10. May 30, 2019 #8
    7seriestv

    7seriestv Light Load Member

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    Jan 28, 2016
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    7seriestv, May 30, 2019
    7seriestv, May 30, 2019
    #8
  11. Sep 2, 2019 #9
    Devonbrett

    Devonbrett Bobtail Member

    1
    0
    Sep 2, 2019
    0
    My comfort pro keeps saying main engine interlock and refuses to even try to start. Like my engine is running when it's not. Help!
     
    Devonbrett, Sep 2, 2019
    Devonbrett, Sep 2, 2019
    #9
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