If the car is later than 1996 then the computer can be talked to via
OBD-II.  This is a suite of protocols (VPN, PWM, and ISO) that are
mainly concerned with vehicle emissions.  However only a limited amount
of information is available, and even fewer parameters are settable, or
known publicly to be settable.  There is much more available, but it's
not public.  A lot has been reverse engineered, but it's highly
make/model specific.  You may be able to get some limited info from the
manufacturer if you can give a good enough reason (research project, etc)

Hopefully you'll find what you're looking for with your particular vehicle.

-Adam

Matthew Brush wrote:

>Hello all
>
>I'm interested in researching some automotive circuits however my searches thus far have yielded nothing.  Basically, what I'm looking for, is some information on interfacing to the vehicles on-board controller to change various settings like air/fuel mixture, getting tach readings, etc.
>
>Is there a standard bus or something?  I remember seein CAN and LIN, is this something I should be looking into.  I think my problem is that I just don't know the proper search terms.  If anyone could maybe give me some search terms to look up or maybe some names of interface protocols, etc, it would be greatly appreciated.  Any links would also be welcome.
>
>Thanks so much in advance.
>
>MJ Brush
>
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