Shell game, no peeking...

[Programmer]

Do you have a "sensor simulator" ? Then you can watch a scan tool and go pin
by pin. I think one is marketed through bluestreak ignition
or standard motor parts. The ground will hopefully be case grounded <g>...

Lyndon.
----- Original Message -----
From: Bruce <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Wednesday, June 27, 2001 6:11 PM
Subject: Re: Shell game, no peeking...


>
> 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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