BENDIX EC-80 ATC ABS FAULT

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by tjtyler3915, Oct 5, 2022.

  1. tjtyler3915

    tjtyler3915 Bobtail Member

    2
    2
    Jul 8, 2022
    0
    Hello all, work for a small fleet, got a 2020 kw t880 in the shop with an intermittent abs code. code is a 30-23. "Modulator commons shorted ground (spn 802 fmi 4 blink code 12-7). I tore the abs module out of the dash to inspect connectors terminals and wiring, all was ok. I disconnected one by one each modulator valve, my truck has 6, couldnt pinpoint one specific one. followed the trouble shooting tree in bendix acom program. Is it possible i have a bad module? code will become active and inactive randomly just sitting here over a couple hours. Thanks!
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Goodysnap

    Goodysnap Road Train Member

    3,046
    7,121
    Jul 12, 2017
    0
    Most common you will find a modulator common shorted somewhere on the ABS chassis harness. Ohm to ground on the chassis harness at the firewall connector. You can usually shake it down to find the rub.
     
  4. spsauerland

    spsauerland Road Train Member

    4,291
    10,847
    May 31, 2010
    West Harrison, In
    0
    Low voltage to ABS module or a bad battery can also cause this FC if you can't find a short to power at all... Same exact issue two weeks ago. Batteries weren't even two months old. It would read about 2 Volt on common until I changed out batteries. One tested shorted cell. Rush Truck Center "special" economy line batteries. We had a weird crank issue on one truck and transmission shifting issues on another because of these batteries.
     
    Last edited: Oct 6, 2022
    tjtyler3915 and BoxCarKidd Thank this.
  5. tjtyler3915

    tjtyler3915 Bobtail Member

    2
    2
    Jul 8, 2022
    0
    Sorry for not replying! I actually did end up finding a bad wire using a similar method. Wire was rubbing through to a mounting bracket next the CECU under the driver floorpan.
     
    Goodysnap and spsauerland Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted