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Need assistance.. Electrical issues 2007 Volvo VNL

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TCF, Apr 18, 2023.

Page 3 of 7
  1. Apr 19, 2023 #21
    TCF

    TCF Light Load Member

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    Also fairly new and checked.... Checked all the way up the frame..
     
    TCF, Apr 19, 2023
    TCF, Apr 19, 2023
    #21
    Rideandrepair Thanks this.
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  3. Apr 19, 2023 #22
    TCF

    TCF Light Load Member

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    Yeah..... Can't really argue with that.
     
    TCF, Apr 19, 2023
    TCF, Apr 19, 2023
    #22
    Rideandrepair Thanks this.
  4. Apr 19, 2023 #23
    TCF

    TCF Light Load Member

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    This and sensor 2.
    Replaced both and cleaned the terminals on the connection as well as greased them up.
    #2 hasn't seemed to have popped yet... Just got to the rail yard..
    #1 comes on immediately.
    The error for #2 was fmi 2..
     

    Attached Files:

    TCF, Apr 19, 2023
    TCF, Apr 19, 2023
    #23
    Rideandrepair and D.Tibbitt Thank this.
  5. Apr 19, 2023 #24
    D.Tibbitt

    D.Tibbitt Road Train Member

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    You should get a test light and probe the pins on the inside of the tractor side of the plug (where your electrical cable plugs into then connects to trailer)- on the brake light pin to see if you have power to it... If you do.. Then plug cord in and test the pin on the plug itself thats going into your trailer... Just because the cord is new doesnt mean anything. It could be a broken wire inside or it is not fully connected to the pins inside of the plug itself...A test light is your best diagnostic tool for electrical troubleshooting.. They cost maybe 10 dollars at the truckstops...
     
    D.Tibbitt, Apr 19, 2023
    D.Tibbitt, Apr 19, 2023
    #24
    Rideandrepair, Phoenix Heavy Haul, TCF and 1 other person Thank this.
  7. Apr 19, 2023 #25
    D.Tibbitt

    D.Tibbitt Road Train Member

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    Ok and you said you replaced those 2 brake signal sensors and its still throwing a code? Maybe it is a computer problem after All.. Is this your truck ? Or a company truck?
     
    D.Tibbitt, Apr 19, 2023
    D.Tibbitt, Apr 19, 2023
    #25
    Rideandrepair and TCF Thank this.
  8. Apr 19, 2023 #26
    TCF

    TCF Light Load Member

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    I'm at the rail yard now... And 4 in a row are fine... All working...
    I went right down the street to the rail yard so maybe I haven't hit the right bumps for the issue to happen? But last week I drove a similar distance and the problem was there right away.
     
    TCF, Apr 19, 2023
    TCF, Apr 19, 2023
    #26
    Rideandrepair and D.Tibbitt Thank this.
  9. Apr 19, 2023 #27
    TCF

    TCF Light Load Member

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    Mine unfortunately....
    It says it's those sensors... When I look on here for the "help with codes"... Lots of stuff says abs and tone rings on the front wheels....
    So I'm a bit lost on those.

    Someone said they got the same error after having front suspension work done because alignment and sensors weren't properly calibrated after the work? I just had front suspension work done but my rig is an 07...i don't think I have those fancy things?

    Also... Having another issue where the reserve pressure tank gauge keeps dropping to 0 and setting the alarm off..
    Changed that sensor...didnt fix the issue...
    Trying a dash swap now.. But the morning after I changed it... I drove almost 200 miles before the issue started again...
     
    TCF, Apr 19, 2023
    TCF, Apr 19, 2023
    #27
    Rideandrepair and D.Tibbitt Thank this.
  10. Apr 19, 2023 #28
    D.Tibbitt

    D.Tibbitt Road Train Member

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    If it is interminttent like that , it leads me to believe there is a loose wire somewhere inside that cord or plug.. Its hard to know without having it right in front of me tho... Im sorry im not much help at all... What is your make and model and year of truck? May be able to find a wiring diagram
     
    D.Tibbitt, Apr 19, 2023
    D.Tibbitt, Apr 19, 2023
    #28
    Rideandrepair, TCF and 2Tap Thank this.
  11. Apr 19, 2023 #29
    Lexuslane

    Lexuslane Medium Load Member

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    I’d also check the ground wire from the truck to the pigtail connection on the back of your tractor .

    and is it possible to get a pigtail tester that plugs inline ?
    So you can see it while the trailer is plugged in ?

    I have one like that for my utility trailer at home .

    also
    You might want to try using a jumper cable from the tractor to the trailer to ground the trailer .

    you can have some weird issues

    years ago when I first started , I would always check the lights by turning on the headlights and the flashers and walking around the rig .

    A few months later , someone at a large intersection honks and tells me the right light is blinking on the trailer and the left light is blinking on the tractor , (this was on a 80s cab over with the signal lights out on the mirrors )

    anyhoo, I checked and the right and left turn signal wires were crossed in the pigtail .
    Don’t know who did it or how no one , including me ever noticed .
     
    Last edited: Apr 19, 2023
    Lexuslane, Apr 19, 2023
    Lexuslane, Apr 19, 2023
    #29
    Rideandrepair, TCF and D.Tibbitt Thank this.
  12. Apr 19, 2023 #30
    bad-luck

    bad-luck Road Train Member

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    Have you checked the volts at the electrical cord and the ground?
     
    bad-luck, Apr 19, 2023
    bad-luck, Apr 19, 2023
    #30
    Rideandrepair Thanks this.
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