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Speedo not working

Discussion in 'Peterbilt Forum' started by kwforage, Apr 18, 2013.

  1. Apr 18, 2013 #1
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    1995 378 with a 3406E. I replaced the sensor on the trans and swapped the gauge with another truck that I know worked. Any ides?
     
    kwforage, Apr 18, 2013
    kwforage, Apr 18, 2013
    #1
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  3. Apr 18, 2013 #2
    Alberta heavy haul

    Alberta heavy haul Bobtail Member

    6
    2
    Mar 2, 2013
    Edmonton,Alberta, Canada
    0
    2 ideas: Broken wire, bad tone ring on output shaft
     
    Alberta heavy haul, Apr 18, 2013
    Alberta heavy haul, Apr 18, 2013
    #2
    kwforage Thanks this.
  4. Apr 19, 2013 #3
    kwcam

    kwcam Light Load Member

    193
    145
    Dec 29, 2012
    at the shop
    0
    If there are vss codes logged the issue is between trans and ecm, does your cruise work? If you use Cat ET there is a speedo test that can be used to check the wiring signal from the ecm to the speedo head, when activated the speedo will read 55 mph.
     
    kwcam, Apr 19, 2013
    kwcam, Apr 19, 2013
    #3
    kwforage Thanks this.
  5. Apr 19, 2013 #4
    kwforage

    kwforage Road Train Member

    1,047
    472
    Jun 3, 2007
    Wisconsin
    0
    Cruise does work. Maybe I will take it in and see if they can get a signal from ECM to speedo to try to narrow it down.
     
    kwforage, Apr 19, 2013
    kwforage, Apr 19, 2013
    #4
  7. Sep 12, 2020 #5
    Jjank

    Jjank Bobtail Member

    1
    0
    Sep 12, 2020
    0
    Did you find out the problem
     
    Jjank, Sep 12, 2020
    Jjank, Sep 12, 2020
    #5
  8. Oct 4, 2020 #6
    Loaderlou

    Loaderlou Medium Load Member

    342
    130
    Feb 24, 2014
    0
    I might be a little late on this subject but I had the same problem. From the transmission harness it connects to another harness to the ecm. Mine rubbed through about midway where the clutch rod is. Check there also
     
    Loaderlou, Oct 4, 2020
    Loaderlou, Oct 4, 2020
    #6
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