ALDL on V6 Cavalier

[Eric S]

Well, I was able to recieve chatter from the ECM, I think I got the timing 
right, I guess I just don't have the background.  I am pretty new to this 
ECM stuff, I do some simple modifications on my own code for my car, so I 
have a pretty good idea at what goes on.

EFI live is just as confusing to me as hell right now, I can't get any 
information requests to work right, (RPM, temp, anything)  I just don't 
understand heartbeat, suspend, and all that.

I do understand that the ECM needs a MODE 0 command, then it needs a MODE 1 
command (to tell it to start sending ALDL frames)  Then I need to figure out 
the specific request codes for the data that I want.  I have the mode 0 and 
1 info, but the the data request bytes.

I think I have the right data, the right tools, I just need a little 
guidance as to how to apply them correctly.


>From: Barry Tisdale <btisdale at cybersol.com>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: Re: ALDL on V6 Cavalier
>Date: Tue, 18 Sep 2001 18:02:41 -0400
>
>This sounds like the probs I had getting EFIlive to read the 7749 in my
>Syclone.  Worked back & forth w/ Paul Blackmore unitl we got it to work.
>Once you've got the 8192 baud (actually 8200, IIRC, OUTing the UART
>registers to get that), timings are critical w/ this ECM.  The interval
>between receiving the chatter (F0 55 BB) needs to be between 3 and 5ms -
>any more or less, you won't linkup.  There is also a delay needed between
>receiving the last of the 71 data bytes & issuing another transmit request
>- I forget what this is, somewhat longer than 4ms, though.  My logger
>software has grown to the point of not needing any delay here, due to slow
>processor & lots of code to process.
>
>FWIW - Barry
>
>At 05:16 PM 9/18/01 -0700, you wrote:
> >I've got EFI live, and I am trying to get it to work, so far to no avail
>
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