sure its possible....
but it would not be very easy!!! as stevedee3 said you would need a real tech 2 to see how it communicates. the things ive looked at dont really use can bus or anything like what the tech 2 uses, just the signal cables. the chips i use do support can bus, and have instructions and everything there to work with can busses. i havent looked into it at all, i saw it, thought thats interesting had a quick look but i think thats can busses as a general thing, you would need to know what communications the car uses and all of that stuff, without it it could be quite difficult.