O2 sims

[Brian L Massey]

On Fri, 14 Sep 2001 10:16:00 -0500 Gary Heuston
<gary.heuston at afwa.af.mil> writes:
> you
> need to
> attach O2 simulators to the wiring to fool the computer into 
> thinking
> the second
> set of O2's is working properly...I was just wondering if there was 
> a
> way to
> build these on your own instead of paying $90 for a pair...

I sure would try some 0.5 V fixed voltages for these posterior sensors
before spending any money. I was under the impression that a code would
be thrown if the *post*-cat sensors *weren't* at a stable value somewhere
near stoich. I suppose if the ECM designer was trying to be clever, he
would watch to see if the sensor appeared to be warming up, but I doubt
if even this is workable; in control system restarts, you can never
assume a cool-down before restart (as much as we might like to for
convenience). So I think it would be problematic to look for anything
*but* a stable near-stoich reading from the post-cat sensors. Well, check
that; they could look for an open sensor connection, but that would be
taken care of with the 0.5 V source having a somewhat low impedance.

That's why I've been puzzled each time someone mentions these
"simulators". Has *anyone*  tried just a simple static voltage of around
0.5 V, preferably buffered?

Brian
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