749 question(s)

[Charles Morgan]

A good introduction to OBDII is in this month's (October) Circuit Cellar.

Charles Morgan

At 08:24 PM 10/1/00 -0400, Lou wrote:
>Is there anywhere that I can get information on OBD-II communications?
>I would like to build an OBD-II to rs232 interface, and monitor my car's
>info. I have seen lots of products for sale that do this, but being an
>engineer geek, I want to understand exactly how OBD-II communications work.
>Is it RS-232 UART framing? Is it synchronous data like a T-1  Is there a set
>of (standard) commands, like "give me water temp" "adjust O2 calibration"
>and things like that. Basically, Where can I get info to learn this stuff? I
>hit the SAE web page, but they want to charge $$ for the standards, and
>having read ICD's before, I know how useless the can be sometimes,
>So, I put the question to you folks, the undisputed experts in reverse
>engineering automotive fuel systems.

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