About Backwards Compatibility

[JonBonJoVicious]

I have a 2001 Audi Allroad with a 2.7t and an Auto trans. It seems the 2001 doesn't use a CAN bus for diagnostics. Furthermore, I can not get the Scantool to connect to the car using a CAN protocol. It will over the older ?K-line? (ISO 9141-2).

While you were writing this, (its excellent by the way) did you happen across any information that I could use to make this compatible with this ODB2 protocol?

For what its worth, I am using a Scantool ODBLink SX which has the basic ELM327 functions as well as some additional Scantool proprietary ones.

Thank you for your work and time.

[jazdw]

Hi yeah, your vehicle is older so it will only support diagnostics over the K-Line.

There is a lot of information on VW's KW 1281 protocol here - http://www.blafusel.de/obd/obd2_kw1281.html
Its similar when using CAN but its encapsulated differently.
The page is in German but you should be able to follow it using Google Translate.