reading GM computer codes was: newbie here, gotta few

[peter paul fenske]

Hi Greg

The 86 TBI engine didn't use a P4 as much as I know.
It used the C3 a 6801 based ecm

The baud rate is a weird 160 PWM stuff.

There was quite a bit of stuff done on this net before.

Really do look through the archives..

I think Oliver and a few other chaps did have workable solutions.

I have not done anything with 160 baud.

GL:peter

At 08:45 AM 6/16/97 -0500, you wrote:
>
>> first off check the archives for info I ve posted.
>> 
>> There is softwaree, a C language listing and a interface schematic
>> 
>> Which ecm are you using. the 165 or the 730. The stuff I posted
>> pertains to the 730.
>> 
>> The 165 P4 is a bit of a bear because it wants to use 160
>> baud.
>> 
>> You have to send a 80 57 01 header to get it to send at
>> 8192 baud but only when it has ended a 160 baud frame.
>> 
>> Anyways good luck:peter
>
>Peter (& Matt),
>
>I hate to ask a stupid question but, how do I tell which ECM I have?
>Mine is out of an 86 S10 with a 2.8l engine.  I didn't see any numbers
>stamped on it anywhere.
>
>Also, Is this C code in an archived message?  Is it available at 
>a web sight somewhere? 
>
>I desperately need to read the codes coming out of my ECM.
>TIA
>
>Greg Woods
>gwoods at symtx.com
>86 Cherokee with GM 2.8L, 
>TBI installed but not yet running!
>
>