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pablo help

Discussion in 'Volvo Forum' started by big al 780, May 9, 2012.

Page 2 of 4
  1. May 16, 2012 #11
    big al 780

    big al 780 Bobtail Member

    21
    0
    May 5, 2012
    st louis mo
    0
    Pablo help
    I replaced the 20807261 and truck start doing same thing
    I took truck to dealership and they checked and they can't find any problems
    Plus I have problem now with transmission from 1 to 2, 2 to 3 I have to shift manually
    Please help
    What would you check
     
    big al 780, May 16, 2012
    big al 780, May 16, 2012
    #11
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  3. May 16, 2012 #12
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    20807261 is just a valve. I sugest no one checked wiring! Look at diagram, so easy to understand how this stuff works.

    [​IMG]

    J1939 issue - NO AUTO shifting, becouse tranny unit cant get rear wheel speed data from MID136, so shifting is in manual mode only
     
    Pablo-UA, May 16, 2012
    Pablo-UA, May 16, 2012
    #12
  4. May 16, 2012 #13
    big al 780

    big al 780 Bobtail Member

    21
    0
    May 5, 2012
    st louis mo
    0
    They did check wiring put test ecu and new part valve
    Does same thing
    When I get home I am going to check by my self
    Could any sensor do that
    Please I am helpless because I am going to pay them for 1 day and still same
     
    big al 780, May 16, 2012
    big al 780, May 16, 2012
    #13
  5. May 16, 2012 #14
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    what is the coolant temperature reading? what is the air pressure on valve?
     
    Pablo-UA, May 16, 2012
    Pablo-UA, May 16, 2012
    #14
  7. May 16, 2012 #15
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    one more quation. did you check valve power supply. Do it with 20-55 wt bulb, not with DVOM. It is important becouse it is easier to find bad connection under load (I=P/U=(20 .... 55)/12 ~~ 2-5A)
     
    Pablo-UA, May 16, 2012
    Pablo-UA, May 16, 2012
    #15
  8. May 17, 2012 #16
    big al 780

    big al 780 Bobtail Member

    21
    0
    May 5, 2012
    st louis mo
    0
    I check wires from ecu to inside cab
    All wires are fine
    What makes ecu to turn fan is it coolant temperature sensor, intake manifold pressure/temperature sensor
    And how can I test them
     
    big al 780, May 17, 2012
    big al 780, May 17, 2012
    #16
  9. May 18, 2012 #17
    big al 780

    big al 780 Bobtail Member

    21
    0
    May 5, 2012
    st louis mo
    0
    Can ac do all this
    Can ac high pressure switch do this
    I checked all wires and they are fine
    I don't know where to look any more
     
    big al 780, May 18, 2012
    big al 780, May 18, 2012
    #17
  10. May 18, 2012 #18
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    a/c and fan are related, but not directly) LOL
     
    Pablo-UA, May 18, 2012
    Pablo-UA, May 18, 2012
    #18
  11. May 18, 2012 #19
    big al 780

    big al 780 Bobtail Member

    21
    0
    May 5, 2012
    st louis mo
    0
    So what would do that
    Would any sensor make fan run
     
    big al 780, May 18, 2012
    big al 780, May 18, 2012
    #19
  12. May 18, 2012 #20
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    IMO, you do all the wrong way, can you pull engine ECM fault codes? did you fix J1939 wiring ore did you find faulty ECU that shorts J1939?
    Did you check valve voltage supply?
     
    Pablo-UA, May 18, 2012
    Pablo-UA, May 18, 2012
    #20
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