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Problems with speedometer and Qualcom

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by JoeV80, Mar 14, 2018.

  1. Mar 14, 2018 #1
    JoeV80

    JoeV80 Bobtail Member

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    When I start running the speedometer starts going up and down until about 45 mph. Then it works good. For some reason my Qualcom Elog is giving me a critical event or hard stopping. Is this related? Fix?
     
    JoeV80, Mar 14, 2018
    JoeV80, Mar 14, 2018
    #1
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  3. Mar 14, 2018 #2
    pushbroom

    pushbroom Road Train Member

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    Yup. Ecm is seeing a bad speed signal and then sharing the bad reading with the qualcomm.
    You more then likely have rubbed out wires going to your speed sensor or a bad speed sensor. Sensor is located on the trans output shaft.
     
    pushbroom, Mar 14, 2018
    pushbroom, Mar 14, 2018
    #2
    spsauerland and Goodysnap Thank this.
  4. Mar 14, 2018 #3
    Goodysnap

    Goodysnap Road Train Member

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    Most likely related. Your qualcomm is seeing the vehicle speed dropping off as a rapid deceleration. Fix your speedo issue all should be well. Give us some truck info to go after. I would start with vehicle speed sensor and or wiring inspection at the sensor and or look for a loose yoke nut at the trans output are most common issues with an Eaton trans.
     
    Goodysnap, Mar 14, 2018
    Goodysnap, Mar 14, 2018
    #3
    spsauerland Thanks this.
  5. Mar 14, 2018 #4
    JoeV80

    JoeV80 Bobtail Member

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    The speed sensor is new. The transmission is oil wet at the end where the yoke is.
     
    JoeV80, Mar 14, 2018
    JoeV80, Mar 14, 2018
    #4
  7. Mar 14, 2018 #5
    JoeV80

    JoeV80 Bobtail Member

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    I will
     
    JoeV80, Mar 14, 2018
    JoeV80, Mar 14, 2018
    #5
  8. Jul 28, 2018 #6
    JoeV80

    JoeV80 Bobtail Member

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    Mar 14, 2018
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    Sorry for delay but problem solved. Took it to Peterbilt and the speed sensor ring was loose. Cost me $800.00 and two days later truck got hit by lightning. Another $1,700.00.
     
    JoeV80, Jul 28, 2018
    JoeV80, Jul 28, 2018
    #6
    Heavyd Thanks this.
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