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Thread: Latest VCDS and Hex-Net problem

  1. #1
    Verified VCDS User
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    Latest VCDS and Hex-Net problem

    So trying to view my injector measurements on '13 Q5 2.0T and no matter what I choose, I cannot run output tests.
    System is using UDS mode so Measurement Blocks is greyed out. Going into output tests to see which injector may be bad, I get "Refused by Control Module" 7F 2F 81
    Not sure if its a problem with my vehicle, but all the videos I've seen shows a CAN protocol, but my car seems to default to UDS...
    Thanks! and feel free to delete if not in the right area

  2. #2
    Benevolent Dictator Uwe's Avatar
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    The protocol a control module uses is what it is; it's not selectable by VCDS.

    Engines can be very fidgety with output tests. Start the engine, let it run for a minute, shut it down, turn on the ignition (but do not start the engine!) and then try output tests again.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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