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TCS light on — air switch bad?

Discussion in 'Volvo Forum' started by southbaydad, May 24, 2019.

Page 2 of 3
  1. May 25, 2019 #11
    Jacoooooooo

    Jacoooooooo Heavy Load Member

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    Oct 20, 2013
    0
    My TCS light was on (together with tractor ABS light) when I had a leaky wheel seal and oil covered the sensor. After repair and cleaning of the sensor problem got solved.
     
    Jacoooooooo, May 25, 2019
    Jacoooooooo, May 25, 2019
    #11
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  3. May 26, 2019 #12
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    UPDATE
    I have looked at about 6 different code charts for MID136 but none show an SID 77 code

    My Code. Is MID 136 SID77 FMI 2

    I have switched out all 4 of the load sensors under the dash
    Blew out the steering sensor ( tho could still be bad)
    Anyone show this code on any of their charts?
    Light still on
     
    southbaydad, May 26, 2019
    southbaydad, May 26, 2019
    #12
  4. May 26, 2019 #13
    Newto Trucking

    Newto Trucking Medium Load Member

    359
    225
    Dec 26, 2013
    NE Illinois
    0
    Do you have a disk brakes??
     
    Newto Trucking, May 26, 2019
    Newto Trucking, May 26, 2019
    #13
  5. May 26, 2019 #14
    Snailexpress

    Snailexpress Road Train Member

    2,675
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    Apr 28, 2014
    Rocky
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    Here is your code. By description it means signal voltage is way out of range or no signal at all. Definitely wire or plug problem.
    2019-05-26 20_15_55-AVScrollView.png
     
    Snailexpress, May 26, 2019
    Snailexpress, May 26, 2019
    #14
    southbaydad Thanks this.
  7. May 27, 2019 #15
    Snailexpress

    Snailexpress Road Train Member

    2,675
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    Apr 28, 2014
    Rocky
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    Do you know how to work with ohmmeter?
    Some hints how to find sensor
    Turn truck on, build air pressure. Depress brake pedal.
    Unplug sensors one by one. Look on the dash gauges which one is out.
    Plug wires back to sensor. Do not unplug more then one at the time it's easy to mess them.
    The sensor you unplug and gauges still working is sensor you looking for. IMG_20190527_000940719[1].jpg
     
    Last edited: May 27, 2019
    Snailexpress, May 27, 2019
    Snailexpress, May 27, 2019
    #15
    southbaydad Thanks this.
  8. May 27, 2019 #16
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    No— drum brakes
     
    southbaydad, May 27, 2019
    southbaydad, May 27, 2019
    #16
  9. May 27, 2019 #17
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    Very cool thanks for the help
     
    southbaydad, May 27, 2019
    southbaydad, May 27, 2019
    #17
  10. May 27, 2019 #18
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    Ok I will try this and see what happens. I did switch out each sensor with a new one but the light still stayed on. But I guess if it’s not getting any voltage it would probably stay on.
    Do you know if the light will just go off when it is fixed or is there a procedure to reset it?
     
    southbaydad, May 27, 2019
    southbaydad, May 27, 2019
    #18
  11. May 27, 2019 #19
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    When I was switching out the sensors the top right sensor was a newer switch for a Mack truck so I guess there is also a possibility that since someone has been in there replacing switches at some point — that the wrong wiring plug could have been plugged into it??? If they had more than one plug socket unhooked and then plugged them back in incorrectly. I guess I would need a wiring schematic to try and figure that out though.
     
    southbaydad, May 27, 2019
    southbaydad, May 27, 2019
    #19
  12. May 27, 2019 #20
    southbaydad

    southbaydad Light Load Member

    281
    34
    Dec 10, 2009
    Arizona
    0
    One wiring plug tag is labeled at/ r brk one is dt 1 one is dt 2 and the other has no wiring tag
     
    southbaydad, May 27, 2019
    southbaydad, May 27, 2019
    #20
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