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cruise control inoperative

Discussion in 'Trucks [ Eighteen Wheelers ]' started by joecitizen, Aug 8, 2009.

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  1. Aug 8, 2009 #1
    joecitizen

    joecitizen Light Load Member

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    Mar 15, 2009
    Tucson, AZ
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    i have a 93 fld 120 that the cruise control is not functioning. i have no clue as to where to begin to look for the problem, would anyone have ideas?

    thanks
     
    Last edited: Aug 8, 2009
    joecitizen, Aug 8, 2009
    joecitizen, Aug 8, 2009
    #1
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  3. Aug 8, 2009 #2
    msmspilot

    msmspilot Light Load Member

    296
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    Aug 25, 2008
    North Mississippi
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    I know our company Volvos had problems with the cruise and Jake not working. The problem was a spring that was supposed to hold the clutch all the way against a switch that had broken.

    Don't know if that'll help you or not.
     
    msmspilot, Aug 8, 2009
    msmspilot, Aug 8, 2009
    #2
  4. Aug 9, 2009 #3
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Electronic or mechanical engine?
     
    Heavyd, Aug 9, 2009
    Heavyd, Aug 9, 2009
    #3
  5. Aug 10, 2009 #4
    CURTWAYNE

    CURTWAYNE Medium Load Member

    465
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    Jun 4, 2008
    LITTLE ROCK, AR
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    Does your speedometer work correctly?
     
    CURTWAYNE, Aug 10, 2009
    CURTWAYNE, Aug 10, 2009
    #4
  7. Aug 10, 2009 #5
    joecitizen

    joecitizen Light Load Member

    242
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    Mar 15, 2009
    Tucson, AZ
    0
    Thanks for the replys...

    My truck is an electronic N-14 and the speedo is acting funny, tends to bounce around when I am on the highway. It will show, say 65 then drop to about 45 and then move up to about 60ish. It really varies and sometime it doesn't do much at all.
     
    joecitizen, Aug 10, 2009
    joecitizen, Aug 10, 2009
    #5
  8. Aug 10, 2009 #6
    Hardlyevr

    Hardlyevr Road Train Member

    3,270
    2,538
    Jul 30, 2009
    Mapleton Depot,PA
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    well that sounds like a bad road speed sensor, and if it can't tell consistently how fast it's going, then it can't maintain a speed. Does your truck have a way to send or view fault codes? That might narrow it down. As a previous post mentioned the switch on the clutch, there are also switches for the brake pedal, and trailer arm if you have one, and if they are not working properly, will not let a cruise engage.
     
    Hardlyevr, Aug 10, 2009
    Hardlyevr, Aug 10, 2009
    #6
  9. Aug 11, 2009 #7
    CURTWAYNE

    CURTWAYNE Medium Load Member

    465
    68
    Jun 4, 2008
    LITTLE ROCK, AR
    0
    Had a problem with my cruise control. Speedometer and tripmeter wouldn't work either. Turned out to be a magnetic speed sensor in the tranny. Funny thing though, when all that would stop working, the truck wasn't limited to 65 anymore.
     
    CURTWAYNE, Aug 11, 2009
    CURTWAYNE, Aug 11, 2009
    #7
  10. Aug 12, 2009 #8
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Once you loose your speed the ECM basically has nothing to go on and will just run to its max rpm limit. Most trucks are programmed to limit the rpm to something very low if the ECM is missing the vehicle speed sensor to prevent over speed, or driver tampering. On a 93, I am going to guess the speed sensor has two leads on it. One for the engine and the other for just the speedo. You can try switching them and see if that helps. While you are down there you need to check if the output yoke is loose or if the output bearing have excessive play. This will cause the tone gear the sensor reads from to bounce around. Other than that, the ECM needs to see that the cruise switch is on/ set and resume buttons work properly/ clutch switch is in released position, and a stable road speed. The only way to monitor this is with computer and Cummins Insite program.
     
    Heavyd, Aug 12, 2009
    Heavyd, Aug 12, 2009
    #8
  11. Aug 12, 2009 #9
    gafred99

    gafred99 Light Load Member

    155
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    May 28, 2009
    Tignall
    0
    My 97 fld120 is doing the same thing, mine has a 3406E, however the digital dash display for the cat shows the accurate speed.
    Same thing sensor on the tranny?
     
    gafred99, Aug 12, 2009
    gafred99, Aug 12, 2009
    #9
  12. Dec 27, 2011 #10
    joecitizen

    joecitizen Light Load Member

    242
    38
    Mar 15, 2009
    Tucson, AZ
    0
    not wanting to create another thread about the same subject i have already asked about, i figure i would revisit this old thread of mine cause the cruise control still is not working.

    to answer heavyd:

    the speed sensor on the trans has been replaced yet the speedo is still not working correctly. example: when i am travel the speed limit (55 mph) the speedo typically shows 35 mph. the speed sensor has two plugs with each plug having 2 wires.

    i have been chasing electrical issues and believe i have most of the major issues corrected. the latest issue is a red stop engine light turning on then off sporadically, so i got an ecm printout for the fault codes. (getting help on that with this thread: http://www.thetruckersreport.com/tr...elers/164462-n14-got-ecm-codes-123-132-a.html). while looking over the printout, the cummins tech noticed the ecm showed the service brake switch was depressed. the cummins tech told me the switch is probably bad and that is part of why the cruise isnt working. however; the brake lights, turn signals, running ligts and 4-way flashers all work correctly. is there more than one brake switch?

    i purchased a new brake switch and cruise control switch from freightliner. i get to the distribution block under the dash (behind the steering column) expecting to see old switches similar to the new ones, wrong! i go back to freightliner for a diagram and because of the age of the truck they no longer have it and that i need to take the truck to service. well, if i could afford to do that i would not be asking all of the fine peeps on this board for help!

    [​IMG]

    looking at the above picture, i believe these are the two switches i need to replace. (one on #10 and the other on #13) notice the black body of the switches are the same height.

    [​IMG]

    now, these are the new switches freightliner gave me. the one on the left is the brake switch and the one on the right is the cruise control switch. the black body of the cruise control switch is short. all of the other ones are taller. this creates my dilemma, does the cruise control switch go on #10 or #13 on the distribution block or and i looking entirely in the wrong location?

    anyone happen to have a schematic or diagram for this?
     
    joecitizen, Dec 27, 2011
    joecitizen, Dec 27, 2011
    #10
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