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Cruise Control works sometimes, 1994 W900L with Detroit

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Bean Jr., Nov 26, 2017.

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  1. Nov 26, 2017 #1
    Bean Jr.

    Bean Jr. Road Train Member

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    1994 W900L with Detroit, sometimes the cruise control will engage, most times it won't. Most times, fast idle will engage, but not always. Help!
     
    Bean Jr., Nov 26, 2017
    Bean Jr., Nov 26, 2017
    #1
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  3. Nov 26, 2017 #2
    Goodysnap

    Goodysnap Road Train Member

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    Check clutch and or brake pedal sticking or not fully coming up all the way is the most common issue. Make sure the pivots and linkages are free. If you get it to not work try pulling up on the pedals. Next most likely suspect is either switch sticking contacts clutch or brake switch.

    HTH
     
    Goodysnap, Nov 26, 2017
    Goodysnap, Nov 26, 2017
    #2
    Oxbow Thanks this.
  4. Nov 26, 2017 #3
    Heavyd

    Heavyd Road Train Member

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    To make fast idle work, switch must be on, hit set or accel switch, park brake must be set, clutch and brake switch are ignored.
    For cruise, switch must be on, hit set or accel, park brake released, service brake released, clutch switch applied.
    Common switch for both situation problems is the actual on/off switch and the actual set switch.
     
    Heavyd, Nov 26, 2017
    Heavyd, Nov 26, 2017
    #3
    Bean Jr. Thanks this.
  5. Nov 26, 2017 #4
    I glide 47

    I glide 47 Road Train Member

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    I agree with you also have found the switch loose on the frame
     
    I glide 47, Nov 26, 2017
    I glide 47, Nov 26, 2017
    #4
  7. Nov 26, 2017 #5
    Oxbow

    Oxbow Road Train Member

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    I had the same problem recently with a Cat. It was the on/off switch in dash.
     
    Oxbow, Nov 26, 2017
    Oxbow, Nov 26, 2017
    #5
    Bean Jr. Thanks this.
  8. Nov 26, 2017 #6
    Bean Jr.

    Bean Jr. Road Train Member

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    I'll rule out power switch and get back to you.
     
    Bean Jr., Nov 26, 2017
    Bean Jr., Nov 26, 2017
    #6
    Oxbow Thanks this.
  9. Nov 26, 2017 #7
    goldwing-rider

    goldwing-rider Bobtail Member

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    Parking brake switch make that problem, cruise/fast idle intermitent problems
     
    goldwing-rider, Nov 26, 2017
    goldwing-rider, Nov 26, 2017
    #7
  10. Dec 5, 2017 #8
    Bean Jr.

    Bean Jr. Road Train Member

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    I think i may have discovered something. When I kick on the fast idle, the cruise won't work. When I don't it does seem to work. I'll try again to verify.

    If that's the case, what do y'all think of that?
     
    Bean Jr., Dec 5, 2017
    Bean Jr., Dec 5, 2017
    #8
  11. Jan 5, 2018 #9
    Bean Jr.

    Bean Jr. Road Train Member

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    I appreciate everybody's help. I had to leave the truck running this last week because of the single digits and below zero. 2 things happened. First, the fan turned off, and second the cruise control started working all the time. I don't know what was wrong, but it's working now.

    BTW, it really is needed as it's a dual torque DDEC 2, so when I'm on the pedal, it's only 355 hp!
     
    Bean Jr., Jan 5, 2018
    Bean Jr., Jan 5, 2018
    #9
    Oxbow Thanks this.
  12. Apr 10, 2018 #10
    Bean Jr.

    Bean Jr. Road Train Member

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    That was it. The dash valves had to be replaced. When I pushed in the tractor park, when on fast idle, it wouldn't turn off fast idle. Valve changed, cruise control works.
     
    Last edited: Apr 10, 2018
    Bean Jr., Apr 10, 2018
    Bean Jr., Apr 10, 2018
    #10
    Oxbow Thanks this.
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