I made a little interface (see
http://opengauge.org/~obduino/diagram/CANduino.gif ) and plugged it on my Arduino, it works
I modified the code to work with the ELM327, init has some problems it seems, but as I don't check error, it went through...
I can see the RPM on my display, pretty cool, but *argh* VSS is not supported by my ECU it seems?!!??! so I can not display speed or calculate consumption. MAF is working at least!
Time to investigate... I should be able to upload a fake application on the duino and with a null cable talk directly from a laptop to the ELM327 as it will go through the MAX232 of the duino board, and I could test some dos/windows application.