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hеxtic
07-01-2012, 01:11 AM
I would like to construct a computer which attaches to the port which grants access to the engine's computer. As I understand, this port is somehow standard, and can also provide diagnostic/detailed information which is not visible on the dash board. Does anyone have more details on how I might access this programmatically? If it matters for anything, I use Arduino boards as my swiss army knife.

dlineownzu4life
07-01-2012, 01:17 AM
That standard plug/code is OBD-II.
http://arduino.cc/forum/index.php?topic=95037.0 Perhaps a good place to start? I googled "OBD - ii arduino" ;)

http://www.arduinodev.com/connect-arduino-to-a-car-through-obd-ii-port/
Also may be useful.

AaronGTR
07-01-2012, 09:23 AM
just fyi, you can plug something into it, but it's not going to give you access to the computer or allow you to change anything without the proper software. You need something that can decode the engine programming.

There are already two things out there that will allow you to do this. You can get a tuner from HP tuners http://www.hptuners.com/. Also you can sometimes find and purchase a used DHP powertuner. They aren't around any more but they made an interface and software that allowed you to program many GM v6 cars from 96-05, and there are a lot of them out there so you can find people selling them used for cheaper than HPT. There is also a free programmer called tiny tuner that grants access to more parameters and can be used with the DHP interface.

dlineownzu4life
07-01-2012, 12:33 PM
From what I read they aren't trying to do any tuning Aaron, only read the data coming out that's basically what most gauges show.

HOYS
07-01-2012, 09:11 PM
Arduino + OBD 2/Non-Can systems has pretty much no support past what a scan guage can do unless you want to program in special things.