Jake Brake not working Cruise control working

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Tama Mai Hawaii Nei, Oct 1, 2020.

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  1. TechPL

    TechPL Bobtail Member

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    Full VIN please

    Thank you
     
    TechPL, Oct 7, 2020
    #11
  2. TTNJ

    TTNJ Heavy Load Member

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    Brake foot valve sticking?
     
    TTNJ, Oct 7, 2020
    #12
  3. lester

    lester Midwest's #1 Feed Hauler

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    When they are hooked in with cat ET they should be able to see when you toggle the Jake switch on and off. That would help narrow down the search. If it shows it on then you know the problem is after the ECM. If it doesn't it could just be a bad switch or wiring problem before the ecm. I think anyway
     
    lester, Oct 8, 2020
    #13
  4. north60

    north60 Bobtail Member

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    The reason I mentioned clutch switch is because when you press the clutch it usually shuts off your jake (allowing you to shift gears without slowing the engine down) it also usually kicks out your cruise control as well.
     
    north60, Oct 8, 2020
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