749 question(s)

[alexpeper]

This is a ISO interface, could be used on Catera and Geo.
Alex
----- Original Message -----
From: Charles Morgan <charlesmorgan at home.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, October 01, 2000 7:48 PM
Subject: Re: 749 question(s)


> 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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