OBDII troubleshooting directories

I recently qualified top in school to compete in something called the Ford/AAA troubleshooting competition. Its one of those..high school bloodbath everyone-at-your-throat kind of things, but that's beside the point.
Anyway, I'm having a bit of trouble finding some resources with which to study workings of later-model vehicles, with an emphasis maybe on OBDII systems. The competition is going to be one that revolves around finding multiple controlled problems in a car, and then fixing the problem. They do things from sticking a tennis ball in the intake routing to installing spark plugs with no conductors to butchering inertia switches..stuff like that. Anyway, if anyone knows of any sites or books with some info, I'd appreciate it if you could let me know.

Oh, and I think the vehicle I'll be working on will be a late-model ford of some kind. Probably a cobra since for some reason Ford is dying to give them to schools as prizes.