What model ECM is this ?

[Andrew K. Mattei]

>Being the ECM is mounted upside down so that the E-prom door is on top for
>quick chip changes
>I removed the ecm and sure enough there is a tag on the top.
>
>It read  SERV No 01228331


I received email from a fellow (Hans) in Switzerland the other day, who was
looking for calibration software for his 1990 ZR1. He had the same ECM part
number (1228331). I couldn't find any cal software (Tunercat didn't have
any), but The Turbo Shop (http://www.ttspowersystems.com) has software
available for download on their web site that can scan both the 90-92 ZR1's
and the 93-95 ZR1s (provided you have an RS232 to ALDL adapter ;^) ). Since
you list your ECM as a 1990-1992 model, but your car is a 1995, perhaps
entering the VIN in Diacom makes Diacom configure itself for a 1993-1995
model, which would likely not communicate.

And as for your later email, in which you list the alternate controller
computer that talks to all the ABS, etc. stuff, that one's not required by
Diacom to properly communicate. It's trying to talk to the ECM alone.

Have you checked the actual pinouts on the ECM to see which line is the
"serial data" line, and tried connecting to that? If you do indeed have a
1228331, you *ought* to be able to talk to it!

Food for thought...

Andrew