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Cruise and jakes not working.

Discussion in 'Peterbilt Forum' started by kwforage, Apr 1, 2017.

Page 2 of 2
  1. Apr 2, 2017 #11
    kwforage

    kwforage Road Train Member

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    I do not have a separate brake light switch. I have 3 wires coming off of 2 post on the switch for the stop lights but that cant be for jakes/cruise if they are NC.

    Is there a way to test the TPS?
     
    kwforage, Apr 2, 2017
    kwforage, Apr 2, 2017
    #11
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  3. Apr 3, 2017 #12
    kwforage

    kwforage Road Train Member

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    Wisconsin
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    Found the brake switch, it was up it the dash. Unhooked the leads and still nothing. Swapped in a known good TPS and nothing. I'm stumped
     
    kwforage, Apr 3, 2017
    kwforage, Apr 3, 2017
    #12
  4. Apr 3, 2017 #13
    Hammer166

    Hammer166 Crusty Information Officer

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    Do you have a computer to plug it into? That would show you the state of the switches and such.
     
    Hammer166, Apr 3, 2017
    Hammer166, Apr 3, 2017
    #13
  5. Apr 3, 2017 #14
    cke

    cke Road Train Member

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    I have a 95 379 that does the exact same thing. It's been hooked to the computer several time and the computer tells there's something wrong with the tachometer. It doesn't say anything about Jake switches at all.
     
    cke, Apr 3, 2017
    cke, Apr 3, 2017
    #14
    Hammer166 Thanks this.
  7. Apr 10, 2017 #15
    Veeg378

    Veeg378 Bobtail Member

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    Clutch switch, happened to me on my 98 378
     
    Veeg378, Apr 10, 2017
    Veeg378, Apr 10, 2017
    #15
  8. Apr 12, 2017 #16
    Pete00369

    Pete00369 Bobtail Member

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    Jul 11, 2013
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    I have the same problem on a 2000 379 my jakes only work on low and the cruise will engage but kicks off right away and I've already put a clutch switch
     
    Pete00369, Apr 12, 2017
    Pete00369, Apr 12, 2017
    #16
  9. Apr 12, 2017 #17
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Diesel Dave, Apr 12, 2017
    Diesel Dave, Apr 12, 2017
    #17
    SAR and kwforage Thank this.
  10. Apr 12, 2017 #18
    Heavyd

    Heavyd Road Train Member

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    I would recommend getting it connected to a computer so you can see what the ECM is seeing and why it won't engage. Probably clutch switch wiring somewhere.
     
    Heavyd, Apr 12, 2017
    Heavyd, Apr 12, 2017
    #18
    SAR, Diesel Dave and kwforage Thank this.
  11. Apr 12, 2017 #19
    kwforage

    kwforage Road Train Member

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    Jun 3, 2007
    Wisconsin
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    ^^^^^ We have a winner. Hooked it to computer and one of the wires from clutch switch to ECM is bad. Just gotta find out where it's bad now.
     
    kwforage, Apr 12, 2017
    kwforage, Apr 12, 2017
    #19
    SAR, Heavyd and Diesel Dave Thank this.
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