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2006 Cummins ISX no high jake brake

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Walleye05, Nov 4, 2015.

  1. Nov 4, 2015 #1
    Walleye05

    Walleye05 Light Load Member

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    Sep 5, 2012
    0
    Hello all, I have a 07 Pete 387 with 06 ISX CM870, it has a 3 way switch for the jakes. low and mid setting do work. When i go down a 6 percent grade, I can tell the difference between low and mid. But when I switch to high, there's no difference. I checked with Insite software on my laptop, it shows 33% for low, 66% for mid, 100% for high so the switch is working.

    What could be not working? I got overhead on it and it made no difference.

    Also on the Insite, it shows 3 engine brake on the logger, Engine brake 1 shows not avaliable or inactive (not sure what the exact word it was) while 2 and 3 showed active . I'm guessing that is just for the solenoid as I believe CM870 only has 2 solenoids right?

    Thanks
     
    Walleye05, Nov 4, 2015
    Walleye05, Nov 4, 2015
    #1
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  3. Nov 4, 2015 #2
    DonJuan360

    DonJuan360 Light Load Member

    65
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    Nov 12, 2011
    New Jersey
    0
    Mine is only working on low also
     
    DonJuan360, Nov 4, 2015
    DonJuan360, Nov 4, 2015
    #2
  4. Nov 4, 2015 #3
    pup

    pup Light Load Member

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    Dec 3, 2011
    n.h.
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    Low is 3 cylinders. Medium is 6 cylinders with no turbo boost. Hi adds boost.
     
    pup, Nov 4, 2015
    pup, Nov 4, 2015
    #3
  5. Nov 4, 2015 #4
    DonJuan360

    DonJuan360 Light Load Member

    65
    2
    Nov 12, 2011
    New Jersey
    0
    What are some causes to make it work on only one setting ...?
     
    DonJuan360, Nov 4, 2015
    DonJuan360, Nov 4, 2015
    #4
  7. Nov 4, 2015 #5
    Walleye05

    Walleye05 Light Load Member

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    Sep 5, 2012
    0
    Pup I read on other posts or pages, they say that low is 1 cyl med is 1-3 cyl and high is all 6 cyl and all use boost.

    Mine uses boost in low about 4 psi and mid about 8 psi, high had no change in boost, stays at 8psi and no change in speed or sound.
     
    Last edited: Nov 4, 2015
    Walleye05, Nov 4, 2015
    Walleye05, Nov 4, 2015
    #5
  8. Nov 5, 2015 #6
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
    0
    low, cylinders 3&4. medium, cylinders 1,2,5,6. & high all 6 cyliners is how an n14 or any older 855 operates. They have 3 separate engine brakes. Your engine has 2 engine brake solenoids that control 3 cylinders each. A more common problem on your engine is that the rocker shafts wear causing an internal oil leak at the engine brake control valves. The engine brake rocker arms don't fill completely with oil & the engine brake works poorly. You could also check the charge air cooler & piping for any leaks that could cause a low boost condition.
     
    pup, Nov 5, 2015
    pup, Nov 5, 2015
    #6
  9. Nov 5, 2015 #7
    Heavyd

    Heavyd Road Train Member

    7,767
    6,204
    Feb 4, 2009
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    With ISX 870 and newer the engine brake selection switch has absolutely nothing to do with which cylinders are braking or not. When you select position 1, you are requesting 33% engine braking load, position 2 is 67% engine braking load and 3 is 100%. The ECM will monitor intake pressure, turbocharger speed and exhaust back pressure and determine how much load the engine is able to absorb versus driver demand during engine braking and will command the turbo to act like an exhaust brake and/or engage the compression brakes in whatever combination it finds best for the current operating condition. So there are times you will not hear the same engine brakes coming on even though the switch is in the same position.
     
    Heavyd, Nov 5, 2015
    Heavyd, Nov 5, 2015
    #7
    Walleye05 and bigguns Thank this.
  10. Nov 13, 2015 #8
    Walleye05

    Walleye05 Light Load Member

    68
    8
    Sep 5, 2012
    0
    It would be nice to have max jake at command.

    I did play around with the switch down lookout pass, I had it on 3rd setting, turbo was showing 12psi, switched to 2, after 3 or 4 seconds, it dropped to about 8 psi. Flipped it back to 3, went up to 12 psi again. So I guess it's working. Could tell the difference also.

    Is there a way to configure it to be on as commanded?
     
    Walleye05, Nov 13, 2015
    Walleye05, Nov 13, 2015
    #8
  11. Nov 13, 2015 #9
    Heavyd

    Heavyd Road Train Member

    7,767
    6,204
    Feb 4, 2009
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    Not that I know of.
     
    Heavyd, Nov 13, 2015
    Heavyd, Nov 13, 2015
    #9
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