How about just opening up the documentation necessary to service or modify the mechanical and microprocessor-based systems in my car and then putting that into

How about just opening up the documentation necessary to service or modify the mechanical and microprocessor-based systems in my car and then putting that into a kindle-like device? I'd much rather have something that would help me diagnose, maintain and modify my vehicle then something like a GPS. I'd also want to subscribe to service that would keep this documentation up to date.