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ABS light , tc and hill

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Konamb, May 23, 2021.

  1. May 23, 2021 #1
    Konamb

    Konamb Bobtail Member

    1
    0
    May 23, 2021
    0
    Hello I have kenworth t680 2020 and a few months ago ABS , TC and hill showed up on my dash. After night usually was good but after a few weeks it was all the time now more of the time i see them again sometimes a few hours is good but not for longer. I checked solenoid and every connector with multimeter and I didn’t find anything unusual. And now I have

    SPN 639 FMI 2 - j1939
    SPN 792 FMI 7 - wheel sensor abs 2 right
    SPN 792 FMI 10 - wheel sensor abs 2 right
    SPN 802 FMI 4 - relay diagonal 1
    SPN 940 FMI 4 - brake system dump modulator valve solenoid axle 2 left
    SPN 792 FMI 2 - wheel sensor abs 2 right
    SPN 520200 FMI 9

    anyone knows something about? can it be sensor out of adjustment or broken sensor ? Or have to go to dealer
     
    Last edited: May 23, 2021
    Konamb, May 23, 2021
    Konamb, May 23, 2021
    #1
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  3. Mar 28, 2023 #3
    Calikidd710

    Calikidd710 Bobtail Member

    21
    1
    Jul 25, 2014
    Riverside, CA
    0
    Did you ever get it figured out? I’ve got the same codes on mine.
     
    Calikidd710, Mar 28, 2023
    Calikidd710, Mar 28, 2023
    #3
  4. Apr 11, 2023 #3
    MWTechGuy

    MWTechGuy Bobtail Member

    17
    6
    Nov 8, 2022
    0
    Looks like a few different things going on here, but mostly seems to stem from wheel end/WSS issues. (639-2= J1939 implausible wheel speed Vehicle/Engine vs ABS "Erratic/Intermittent/Incorrect"), (792-2/7/10=Rear Axle Right - Tire Mismatch, Deviation In Speed/Tone Ring/Speed Drop Out), (802-4= Undervoltage/SHT GND) If the ABS has more than 1 GND make sure both are clean. Basically at least 3 of those faults directly related to the single WSS and the signal from it which is usually loose/damaged connectors, coiled extra extension harness, underinflated tire, damaged/pitted tone ring.
     
    MWTechGuy, Apr 11, 2023
    MWTechGuy, Apr 11, 2023
    #3
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