RE: Strange ALDL Blather

["Rodney Fulk" <elixir@pathwaynet.com>]

Is free scan the prelude to EFlive?
I know someone with a 3.1 in a '94 Corsica and he wants to access his car
via something.
If you have a scan program that will interface into this I would greatly
appreciate hearing about it..


-----Original Message-----
From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On Behalf
Of Jeremy Gonyou
Sent: Monday, June 26, 2000 10:23 PM
To: gmecm@diy-efi.org
Subject: Re: Strange ALDL Blather


Thanks Andrew,

This clears things up some.  I actually lucked out.  Turns out the 3.1
protocol is the same as the 3.4 - which is completely detailed in FreeScan.
I'm still confused about the SumCheck part, however.  Am I supposed to know
the checksum of the stream before I get it?  So I want to send it F4 57 01
64 what?

Bruce, Vin code is "H" for the 3.1.

Thanks

Jeremy

>Remember this is "the chatter", and won't tell you much. The meat is when
>you request data from the ECM>You can pick apart packets from a datastream
>by looking for patterns and
>then calculating the checksum. Use Win 95 Calculator, set to Hex and Byte
>mode. Add all digits, hit NOT, add 1. There's the checksum.
>
>Above, the 25 and 26 are RPM*25 values (925 and 950 RPM respectively), and
>the 40 is intake air temperature.
>
>When you send it a "shut up" command of F4 56 08 AE you can follow it up
>with a Mode Request, and that should start spitting real data at you. There
>are quite a few modes, they follow the format F4 57 01 XX CS, where XX is
>00
>thru ??, and CS is checksum.


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