Any other GM comms speeds?

["Ross Myers" <ponty@axis.jeack.com.au>]

Hi all,

I've been playing around with a 16188269 ECU (Picture is at my web page),
these are strange in that they have no Flash or Memcal, it was built in
1995. The CPU seems to match the HC11 'E' series so I guess it may have 20K
or so of OTP.
Anyway, I'm want to dump the memory contents out via a Mode2 request, only I
cannot get this thing to talk to me!!, the wiring diag shows a
Bi-directional Serial Data line on the ALDL, but no matter what I.D byte I
use for a Mode1 request I get no response (I've tried $01 - $FE).
First thing, the ECM has no 64606 I.C fitted, instead the serial data runs
through transistor/resistor combinations to the CPU Rx/Tx pins.
Secondly, this ECU is used in the U.K on Opel & Vaxhuall cars as well.
So, did GM use another speed other than 8192 for bi-directional comms?.

Thanks,
Ross Myers
Melbourne, Australia
E-mail : ponty@axis.jeack.com.au
Stuff : www.jeack.com.au/~ponty
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