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Trailer Abs does not cycle on/off

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Zekria99, Nov 21, 2022.

  1. Nov 21, 2022 #1
    Zekria99

    Zekria99 Light Load Member

    65
    6
    Nov 25, 2010
    Toronto,Ontario
    0
    I have a Utility Reefer trailer with Bendix Abs valve. The Abs valve does not cycle on/off/on but when ignition power is applied it just light up. Checked the power it has 13v. Checked the sensor it has above1500 ohms. Could it be the sensor is tossed? I cant get the blink codes because it doesn't cycle no clicks nothing. P
     
    Zekria99, Nov 21, 2022
    Zekria99, Nov 21, 2022
    #1
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  3. Nov 21, 2022 #2
    Snailexpress

    Snailexpress Road Train Member

    2,654
    6,034
    Apr 28, 2014
    Rocky
    0
    Trailer ABS doesn't cycle valves. Side ABS light up for short time ti inform you it's powered. If light doesn't cycle with ignition but on every time you depress brake means trailer ABS module energized from brake light and constant power from the truck is lost. Check central wire for +12 volts.
     
    Snailexpress, Nov 21, 2022
    Snailexpress, Nov 21, 2022
    #2
  4. Nov 21, 2022 #3
    Zekria99

    Zekria99 Light Load Member

    65
    6
    Nov 25, 2010
    Toronto,Ontario
    0
    The light on the side just powers on at start. It doesn't cycle on and off. It just turns on and stays on. I am not able to pull the blink codes from the side marker.
     
    Zekria99, Nov 21, 2022
    Zekria99, Nov 21, 2022
    #3
  5. Nov 22, 2022 #4
    Snailexpress

    Snailexpress Road Train Member

    2,654
    6,034
    Apr 28, 2014
    Rocky
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    Ignition Power Activation
    Ignition Power Activation is the process of using
    the vehicle’s ignition switch (or interrupting the
    power on the blue wire by some other means) to
    display blink codes on the trailer ABS indicator
    lamp located on the side of the trailer. This
    method is for constant power vehicles only.
    To obtain blink codes using ignition power
    activation, perform the following procedure:
    1. Turn the ignition switch on for no longer
    than 5 seconds. The ABS indicator lamp will
    be on.
    2. Turn the ignition switch off. The ABS indicator
    lamp will go out.
    3. Turn the ignition switch on. The ABS indicator
    lamp will then come on, then go out.
    4. The blink code will be displayed three times by
    the ABS indicator lamp on the trailer.
    NOTE: For ignition power activation, power is
    provided by the ignition switch
     
    Snailexpress, Nov 22, 2022
    Snailexpress, Nov 22, 2022
    #4
    Rideandrepair Thanks this.
  7. Nov 22, 2022 #5
    Inderjit

    Inderjit Medium Load Member

    626
    609
    Sep 17, 2017
    0
    Try unplugging the trailer plug and plugging it in again with the key on.
    That might get the light to flash a code.
     
    Inderjit, Nov 22, 2022
    Inderjit, Nov 22, 2022
    #5
    Rideandrepair Thanks this.
  8. Nov 22, 2022 #6
    Lazer

    Lazer Road Train Member

    1,399
    2,181
    Jan 22, 2017
    0
    Try changing the power cord.
     
    Lazer, Nov 22, 2022
    Lazer, Nov 22, 2022
    #6
    Rideandrepair Thanks this.
  9. Nov 24, 2022 #7
    Zekria99

    Zekria99 Light Load Member

    65
    6
    Nov 25, 2010
    Toronto,Ontario
    0
    So it was the Abs ecu toast because of short on trailer. The trailer Abs solenoids always cycle when you turn the ignition on. Thank you all for your help
     
    Zekria99, Nov 24, 2022
    Zekria99, Nov 24, 2022
    #7
    Rideandrepair Thanks this.
  10. Feb 10, 2024 #9
    Chuckdriver56

    Chuckdriver56 Bobtail Member

    1
    0
    Feb 10, 2024
    0
    How did you determine that the ABS ecu was toast?
     
    Chuckdriver56, Feb 10, 2024
    Chuckdriver56, Feb 10, 2024
    #9
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