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Thread: ELM327 and 97' Audi A4 Quattro

  1. #1
    Newbie NZHawk's Avatar
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    ELM327 and 97' Audi A4 Quattro

    I have a cheap 'clone' of the ELM327 OBD2 to USB adapter that I have used successfully and without any problems with my Mazda MPV (I have used PalmerPerformance's PCMSCAN to connect and read the codes and live data).
    However.
    I plug it into the OBD2 port in my Audi, and try to connect with PCMSCAN, and I get "Failed to open OBD-II connection! Error 104: Error detecting OBD-II Protocol."

    I know that Audi use the CAN OBDII protocol, But im pretty sure that PCMSCAN supports CAN.
    The cheap ELM327 says it supports all OBDII protocols, (see the image) but find it hard to trust because it is a clone.



    I have heard about different cables, such as the vag-com ($$$$!). But also found an alternative on NZ's Ebay: Trademe: LINK.
    That says it supports the CAN protocol, would it be worth checking it out?
    Or is it just the software? Will the Audi work with software such as DashCommand, because I plan to build a carpc with centrafuse + embed dashcommand?

  2. #2
    Newbie
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    I bought exactly that item from a NZ online store and it doesn't work with my 2001 Audi TT.

    It's not just the software though - at the base level communicating with the ELM chip via AT commands from a terminal you can see it try to open a connection to the OBD port of the car and fail. After reading a PDF with the full ELM spec I tried messing with every combination of protocol and baud rate and was unsuccessful. So either the Audi is doing something weird or the cheap chinese clone doesn't fully support all the possible protocols (probably KWP1281 and/or KWP2000)

    Also - does your Audi have the factory stereo? The stereo is coded to the car for security and uses the K-line to talk to the car. If you have an aftermarket stereo the K-line can be tied to 12V and disrupt the OBD port.

    My advice - return it for a refund or sell it to someone with a car that it can talk to

    I have another adapter on it's way (wifi, iphone compatible) so I'll see if that works.


    Quote Originally Posted by NZHawk View Post
    I have a cheap 'clone' of the ELM327 OBD2 to USB adapter that I have used successfully and without any problems with my Mazda MPV (I have used PalmerPerformance's PCMSCAN to connect and read the codes and live data).
    However.
    I plug it into the OBD2 port in my Audi, and try to connect with PCMSCAN, and I get "Failed to open OBD-II connection! Error 104: Error detecting OBD-II Protocol."

    I know that Audi use the CAN OBDII protocol, But im pretty sure that PCMSCAN supports CAN.
    The cheap ELM327 says it supports all OBDII protocols, (see the image) but find it hard to trust because it is a clone.



    I have heard about different cables, such as the vag-com ($$$$!). But also found an alternative on NZ's Ebay: Trademe: LINK.
    That says it supports the CAN protocol, would it be worth checking it out?
    Or is it just the software? Will the Audi work with software such as DashCommand, because I plan to build a carpc with centrafuse + embed dashcommand?

  3. #3
    Newbie NZHawk's Avatar
    Join Date
    Feb 2010
    Posts
    25
    I seem to have made two threads about this :S

    But thanks for your reply, Ive just bought (Yes, another cheap) VAG-COM cable, as these are meant to read the single K-Line used by 1997 Audi A4's.

    Yea It has the factory stereo, but its crap, so its being replaced by a Carputer.

    Itll be interesting to see if your new cable works, Keep me posted! (Y)

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