jakes on isx

Discussion in 'Trucks [ Eighteen Wheelers ]' started by NW can man, May 21, 2012.

  1. May 21, 2012 #1
    NW can man

    NW can man Light Load Member

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    Apr 4, 2012
    Zillah WA
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    I'm having problems with the jakes on my 04 w900 with a isx. I have stage one and 2 but not three i replaced the solenoid this weekend with no change. Today they hooked up a the dealer and said that we are getting power to the jakes and all looks good but they said we are gettting a code from our wastegate on the turbo is there any connection between the turbo and jakes? they want me to put on a new turbo and egr valve but im thinking its something else. Any suggestions would be great!!
     
    NW can man, May 21, 2012
    NW can man, May 21, 2012
    #1
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  3. May 21, 2012 #2
    jorlee

    jorlee Light Load Member

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    Feb 17, 2007
    ND
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    I'll try and help ya.

    How much boost do you have with jake on 3? The harder I push the jake, the more boost I get. In a 05 ISX. Really helps to get a good overhead done too.
     
    jorlee, May 21, 2012
    jorlee, May 21, 2012
    #2
  4. May 21, 2012 #3
    power freak

    power freak Light Load Member

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    Apr 23, 2009
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    The Vgt turbo is actuated to close the vanes more for the third stage so it is possible that it could be the turbo.
     
    power freak, May 21, 2012
    power freak, May 21, 2012
    #3
  5. May 21, 2012 #4
    Heavyd

    Heavyd Road Train Member

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    CM870s and newer use the VGT turbo for your stage three brake level. The turbo vanes will close and create some exhaust back pressure acting like an exhaust brake. The different levels you select with your switch also doesn't dictate what solenoids come on, the ECM senses the current operating conditions and selects what it thinks is best. If you physically can't feel any difference between levels they may be right with a turbo problem.
     
    Heavyd, May 21, 2012
    Heavyd, May 21, 2012
    #4
  7. May 21, 2012 #5
    country29

    country29 Medium Load Member

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    Feb 27, 2010
    Arkansas
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    +1 ^ what he said
     
    country29, May 21, 2012
    country29, May 21, 2012
    #5
  8. May 24, 2012 #6
    zeefarmer

    zeefarmer Bobtail Member

    3
    1
    May 24, 2012
    Saskatchewan
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    Have you lost stage 3 quite suddenly, or over a period of time. I have a '00 ISX that lost stage 3 jakes slowly. Ended up replacing the cams as they had cavitated.
     
    zeefarmer, May 24, 2012
    zeefarmer, May 24, 2012
    #6
  9. May 24, 2012 #7
    NW can man

    NW can man Light Load Member

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    Apr 4, 2012
    Zillah WA
    0
    We found a code for a faulty crank sensor and when we replaced it they came back but still have a little falter at times so I'm going to replace the harness due to the fact that it looks pretty ratty. Will let you know what we find. The turbo is still running strong so I'm thinking maybe the shop jumped the gun little bit on that one! good thing i was a bit skeptical
     
    NW can man, May 24, 2012
    NW can man, May 24, 2012
    #7
  10. Jul 20, 2012 #8
    PROSTREET80

    PROSTREET80 Light Load Member

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    Jul 11, 2012
    northwest AR
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    How does it have three stages anyway it only has 2 jake solinoids instead of three I always wandered about that.
     
    PROSTREET80, Jul 20, 2012
    PROSTREET80, Jul 20, 2012
    #8
  11. Jul 20, 2012 #9
    Heavyd

    Heavyd Road Train Member

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    One solenoid will control 4 brakes, and the second does 2 on the older engines.
     
    Heavyd, Jul 20, 2012
    Heavyd, Jul 20, 2012
    #9
    PROSTREET80 Thanks this.
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