OBD-II PC shareware & hardware
Start at http://www.opendiag.org/, this shows how to make the serial-to-ISO circuit and has a link to a discussion group that kicks around how the OBD protocol works. The are very interested in the VW proprietary diagnostics lately, not much discussion about anything else. I haven't gotten much out of the discussion but at least the volume is low so I keep tabs on it.
To me the really neat plan is to put the diagnostics on a Palm Pilot instead of a laptop. That shows up in these discussions somewhere, I can't find it right now. You'll run into it if you look around. That's another one that is not quite there but is looking promising.
Another link discussing PC OBD-II in general: http://www.chipcenter.com/eexpert/mladuke/mladuke008.html
More OBD-II discussion - a circuit diagram and several links:
http://www.planetfall.com/~jeff/obdii/
Of course, I can't find the shareware links. Wish I had kept it more organized. They are in there somewhere.
The recent poster that got the software and hardware for I think $129 has in my opinion found the right package at the right price. I wish I had time to dig into this shareware stuff some more, I have enough trouble keeping 3 Volvos running without having to build circuit boards and configuring software off the net.
Good luck,
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