P4 ALDL information request

[TK]

They are P6's. 16171470 I believe. Same as in my 92 SC 3800.

Terry
-----Original Message-----
From: Ward <wspoonemore at excite.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Wednesday, July 14, 1999 6:32 PM
Subject: Re: P4 ALDL information request


>Your 93 is probably a P6, I don't think they were still doing the P4 in 93
>Ward
>
>On Wed, 14 Jul 1999 20:26:53 -0400, Kevin Day wrote:
>
>> Greetings!
>> 
>> I am new here, and new to ECM hacking.  Ever since I got my first fuel
>> injected car, I've wanted to hack the computer.  I was very pleased to
>> discover that I'm not the only one to have this perverse idea.  My first
>> project is to write some scantool type software, and perhaps build a
>> sexy digital dashboard for my 93 LeSabre.  This is partly just to get my
>> feet wet; I would like to eventually start hacking the ECM itself
>> (because it's there, I guess :)
>> 
>> I am waiting for the service manual to arrive in the mail, so for the
>> time being I am not sure exactly which PCM is in my (recently purchased)
>> car.  It is a 8192 baud type, and I have managed to read the "chatter"
>> from the PCM.  I haven't yet tried to send any commands.  What I would
>> like to do is decipher these messages.  The "Turbo P4" document was
>> helpful conceptually, but the format does not seem to jibe exactly with
>> what I read.  This is what I'm getting, over and over, with the ignition
>> on and engine off:
>> 
>> F0  56  
>> F4  C6  
>> 4A  58  42  00  00  1C  
>> 4A  58  42  00  00  1C  
>> 45  5C  42  80  00  35  76  00  8F  63  
>> 4A  58  42  00  00  1C  
>> 4A  58  42  00  00  1C  
>> F0  56  ...
>> 
>> I understand that the F0 56 is the "ping" message for a scantool.  The
>> second message, though, is perplexing.  The C6 message length seems to
>> be wrong - there are 34 data words, plus 56, so I would expect 8A
>> instead.  Anybody know what is going on here, and what the 4A 58...
>> message means?
>> 
>> Can someone point me to more information on this ALDL format?  I am
>> hoping that it has been deciphered already... or, alternately, if the
>> this PCM program has been disassembled (and maybe commented?) that would
>> be amazingly cool.
>> 
>> Thanks...
>> 
>> Kevin
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