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ASV schematics/pinout

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Eliminateur, Feb 17, 2013.

  1. Eliminateur
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    Eliminateur New Member

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    [Feb 17, 2013]
    Does anyone with ELSA access has the electrical diagram for the ASV valve?, the 4 pin one

    Also, what are the expected I/O signals?

    aaaand i know this is probably impossible, but the schematics for the control circuitry inside the ASV would be a plus
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  3. mjr901
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    mjr901 S3 Pollution Plus+ Edition

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    [Feb 17, 2013]
    Absolutely no idea what this is, but a man who is very technical on this forum is NHN.

    Private message him here ------> Send Private Message
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  4. Eliminateur
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    Eliminateur New Member

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    [Feb 17, 2013]
    many thanks, i've found the wiring schematics ( Autotecnic2000.com )
    but i don't know HOW is it controlled, what kind of signal is sent to/from the ASV unit
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  5. mjr901
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    mjr901 S3 Pollution Plus+ Edition

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    [Feb 17, 2013]
    :readit: --------->:think:

    Rather you than me with this!

    Good luck!
    #4
  6. A3SBQ
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    A3SBQ A3 SportBack 2TFSI quattro DSG

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    [Feb 17, 2013]
    Pin 1 is -/ground
    Pin 2 is +/12v
    Pin 3 and 4 is analoug signal for directional and opening/closing level. Probably +/-5v regulating like a servo.

    Not 100% sure thou.
    What does this valve do?

    God luck
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  7. Eliminateur
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    Eliminateur New Member

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    [Feb 17, 2013]
    but which one of 3 and 4 is input and output?, both of them can't be inputs has a simple PWM input can be used to set the desired opening level in %
    the ASV it has 2 functions: antishudder on stop (and preventing a engine runaway as well if it's happening) and modulating the air intake ammount to optimize EGR "suction" (i.e.: closes the air intake so the engine sucks more EGR gases)

    engine is perfectly "functional" without it(other than the CEL light turning on and violent shudder on shutdown) and it's quite an expensive bugger so i want to fix it myself
    #6

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