Vag-com & lambda control

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  • lynx
    S2Forum Enthusiast
    • Jan 2005
    • 125
    • Country: Estonia

    #1

    Vag-com & lambda control

    Hi

    I just checked group 000 and lambda control should be 123-133, but mine showing 14-15, nothing more and nothing less. No matter is is engine hot or cold. But when I check that wire what comes direct from lambda, then there´s normal voltage that should be. But why vag-com showing that kind of info? Broken wire somewhere?

    and others fields what seems odd for me:

    02 (enigne load) - should be 20-24, but mine showing 98-99.
    03 (engine speed) - should be 77-83, but mine showing 44-45.
    09 (lambda adaption) - should be 100-150, but mine showing 205-209
    10 (ignition timing) - should be 35-37, but mine showing 97-99.

    I tried to disconnect lambda, nothing changed.
    I´ m using vag-com 311-2.

    ECU chipped, 3 bar map sensor, etc.

    and one more thing. I installed electrical fuel pressure gauge (actually it' s oil pressure sensor) and something very vierd is going on. I' m using 7A fpr, and idle it' s showing 5-6bar Even is vacuum staying on the place, pressure is still playing. Full throttle all-so 6bar never more, even if I use 2bar overboost.

    I' m using: 7a cams, t04/k26, 391cc@3bar, bigger intercooler, adu ex, 3b engine.

    What may cause this kind' s of problem? I' m using car every day and it' s seems to be ok, only higher rpms engine hesitates.
    Last edited by lynx; 9 July 2006, 19:03.
  • SteveH
    Super Moderator
    • Jul 2003
    • 4460
    • Country: United Kingdom

    #2
    Just checked a log from my car and I have 129 dropping to 127 when warm for Lambda control...Something must be wrong with yours for sure..
    91 Modded 3B
    14 A6 Avant Black Edition

    Comment

    • lynx
      S2Forum Enthusiast
      • Jan 2005
      • 125
      • Country: Estonia

      #3
      Originally posted by SteveH
      Just checked a log from my car and I have 129 dropping to 127 when warm for Lambda control...Something must be wrong with yours for sure..

      agree, but what could be wrong?

      I think I have some time during next week to check it, but I thought maybe someone had same problems? Then I could look something for sure . . . but other case, I have to look everything what is connected with lambda etc.

      Comment

      • lynx
        S2Forum Enthusiast
        • Jan 2005
        • 125
        • Country: Estonia

        #4
        well, at least now I know where my lambda wire goes it goes to a wrong place.
        I should end up at the pin28 from ecu, but mine ends pin29

        and ecu connector seems a bit "odd" for me.

        usually unused pin are: 9, 20, 21, 33, 42, 43, 50 and 51.

        But in my connector are unused:
        11 - what should be knock sensor 1
        24 - what should be control unit ground
        26 - what should be hot wire air volume meter (pin 2)
        36 - what should be electronic output from in on-board com
        37 - what should be voltage output from internal latching rel.

        pin 42, 43, 50 and 51 are too unused like they should be originally.

        Anyway, I' m a "bit" confused. Why lambda wire goes to pin29, what should be knock sensor 2?

        I' m running out of ideas, somebody?

        Comment

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