Shell game, no peeking...

[Bruce]

C3 or P4?.
Lots ecms are based on common PCBs, or at least the pinouts are similiar.
There is a 1.8 voltage drop across a LED.
use say a 1K resistor as a current limiter, and power the LEF off of a 9-12v
supply.
Use 2 (10K ohm) resistors as a voltage divider, of the 1.8 drop across the
LED.
You now have .9 volts and I doubt enough current or voltage to zap *much* in
an ecm.
Again, this is a last ditch effort / idea
Bruce



----- Original Message -----
From: "Shannen Durphey" <shannen at grolen.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, June 27, 2001 7:50 PM
Subject: Shell game, no peeking...


> Any suggestions on locating the 2 pins required to connect an O2 sensor to
a
> mystery ecm?  I'm talking about O2 signal and ground, of course.  The
gotchas
> are 1) No pinouts/schematics showing the O2 connection.  2) The unit is
> completely sealed.
>
> I do have access to O2 values in the data stream, so if the ecm was
receiving a
> value from an O2 sensor, I would be able to tell.
>
> I've thought about supplying a .45 mv signal and "guessing," but I'm a
little
> nervous about doing damage somewhere.
>
> Any thoughts?
> Shannen
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