O2 sims

[Squash]

The info I've heard from a *Ford* tech friend is that the rear, post-cat sensors do not switch,
but so fluctuate a bit.  Supposedly the training he had from *Ford* told him that the ECM would
only look to see that it didn't switch...

I have no clue, just spreading rumors.

Squash

--- Brian L Massey <blocklm at juno.com> wrote:
> 
> 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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=====
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