No Jake or cruise, no switch stuck?

Discussion in 'Peterbilt Forum' started by OFT2024, Apr 23, 2024.

  1. OFT2024

    OFT2024 Bobtail Member

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    Apr 23, 2024
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    05 Pete c13

    Truck is brake to Jake via computer which was working fine cruise worked high idle.

    now it jakes no matter what all cruise functions are gone

    brake lights are not stuck on jolly valve and brake u can hear switch activate.

    clutch and throttle still disengages jake

    all switches appear to be functioning but the truck thinks the brakes are being applied why Jake is on without brake and no cruise

    any thoughts?
     

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  3. skallagrime

    skallagrime Road Train Member

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    Check your jake on/off switches/wires. Obviously if throttle and clutch disengage it, its just getting a constant signal to be on, but its not on the ecm (engine harness) to solenoid side
     
    Deere hunter Thanks this.
  4. Deere hunter

    Deere hunter Road Train Member

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    I would definitely check the clutch switch first.
     
    flood Thanks this.
  5. OFT2024

    OFT2024 Bobtail Member

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    is the clutch switch bassicly a on or off or is it multi function.

    because if the Jake is on and I bump the clutch it kicks off the Jake so in theory it’s working unless it sends more than one signal?
     
  6. Deere hunter

    Deere hunter Road Train Member

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    I might be a little confused, I thought you said the Jakes and Cruise did not work. Maybe I'm not understanding this correctly, but how do you know the clutch switch is kicking them off if they're not working.
     
  7. OFT2024

    OFT2024 Bobtail Member

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    Jake is operating as it “should” on it works off it don’t but it was brake to Jake with it in the on position now it does it without brake applied
     
  8. OFT2024

    OFT2024 Bobtail Member

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    the Jake is supposed to be programmed to only work with brake applied.

    now with the Jake on it just works how most trucks would. (Ecm thinking brake is being applied 24/7 imo) and no cruise

    bump the clutch it kicks the Jake off
     
  9. Deere hunter

    Deere hunter Road Train Member

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    I would think you're experiencing a bad harness between ECM and firewall..
     
  10. skallagrime

    skallagrime Road Train Member

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    With jake brake switch on
    With cruise OFF
    No brake application
    The jakes kick on when you release clutch or fuel pedal.

    This is in fact a correct way for this to work.


    With jake brake switch ON
    With cruise ON
    WITH brake application
    The jakes kick on when you release clutch or fuel pedal.

    This is also correct.


    With jake brake switch ON
    With cruise ON and SET
    No brake application
    The jakes kick on when you release clutch or fuel pedal.

    This is wrong


    You need to list the states that occur to turn on or off the stated items to show PRECISELY what it is you think is happening incorrectly. Because i really cant tell what you mean, i was taking a stab at what i THOUGHT you meant
     
    LameMule Thanks this.
  11. OFT2024

    OFT2024 Bobtail Member

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    # 1 I’ve never tried I’ve always left cruise on since I’ve owned truck. But this is how it’s operating with cruise on atm.

    #2 this is how it was operating normally

    #3 no cruise will NOT engage at all. Jake operates with throttle and clutch released regardless of cruise switch position

    Jake on
    Cruise on
    No brake applied
    Jake engages with the release of throttle
    And clutch

    Cruise will not set with Jake position on or off
    Cruise indicator is lit on dash showing it’s on
     
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