5 baud ECM?

[Malcolm Robb, LC 0112G]

Sounds like the Bosch protocol to me, and what a pain it is. You wake the 
unit up with a 5 baud initial handshake word, then talk to it at 9600 baud. 
Used on most European GM (Opel/Vauxhall) cars, and not only for ECM's - 
Airbag, ABS, AutoTrans, Alarms, the list is endless.

I haven't found anyone who knows how it works, or a cheap DIY style PC scan 
tool. Only thing that works is a real Tech1. I'm glad my car is one of the 
few with a P4 in it.

Cheers,
Malcolm Robb, LC 0112G

-----Original Message-----
From:	Peter Gargano [SMTP:peter at techedge.com.au]
Sent:	Monday, July 16, 2001 1:21 PM
To:	gmecm at diy-efi.org
Subject:	5 baud ECM?

Anyone know anything about the five baud GM ALDL protocol?
I've heard that some Opels use it for initial handshake. Is
this with a GM, or a Bosch ECM?

TIA, Peter.
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