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A4 ECU unable to read faults.

Discussion in 'VCDS (formerly VAG-COM) forum' started by h100vw, Apr 6, 2008.

  1. h100vw
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    h100vw Member

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    [Apr 6, 2008]
    Tried to read fault codes on a mates A4 today. After multiple attempts to read it, I managed to clear the stored faults. Then I started it up and wanted to look at the airflow through the MAF but it wouldn't connect to the ECU.

    I rebooted the laptop and tried all sorts. It would happily connect to the ABS ECU on command.

    Anyone have any ideas for me? I have read about pulling the fuse for the instruments being a cure but that seems a bit daft to me.

    Thanks in advance

    Gavin
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  3. Uwe@Ross-Tech
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    Uwe@Ross-Tech Member

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    [Apr 6, 2008]
    What year A4? What engine? What type of VC lead? What version of VC? I see you were able to connect with the ABS, but what about all the other systems in the car?

    -Uwe-
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