Leading guestions

[Ludis Langens]

Bruce Plecan wrote:
> 
> If, I was to have a O2 sensor that worked at a different range of voltages
> then the gm use, could I just use a comparator at the new Os voltage level,
> and use it to switch from .1 to .9 volts, as it crossed it's 14.7:1?.

I don't think so.  GM likes to compute a long term average of the O2
voltage.  This average is used for some of the fine tuning during closed
loop.  The target average is specified in the PROM.  In one application,
this value changes between just about every PROM version.  A 4-speed
PROM has a different value from a 5-speed PROM, and both differ from an
automatic PROM, and so on.

You might be able to insert an analog amplifier (or voltage divider)
between the "new" O2 and the ECM's O2 input.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/
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