I'm going to order the chip:http://www.scantool.net/products/pro...&products_id=8

And I'll make the pcb myself with this: ElmScan VPW Schematic/PCB 1.0/A

And then use their s/w if you think I need anything else, please advise.

I'm going to mainly use this with a 2003 Chevy Avalanche so I hope that it is the vpw that I need. I was really hoping to record the actual data from the vehicle in serial form which I think you are saying this will do it, and prog that data into the PIC and have the PIC TX it with SEROUT.Would I still need the ELM chip in the circuit in order for this to communicate with the data bus ?

The actual data I refer to is say,what is produced on the data bus only when one button is pushed. Is all this reasonable?

Thanks again!