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Green wire is NOT the O2 sensor signal... 200 1991

posted by  lucid on  Wed Mar 16 15:10 CST 2011
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

When I posted that title about the Green wire, you were looking for fuse 4 voltage, and I assumed that the 2 wires sensing wires were connected. But I see now that you had the wires "unplugged".

"Ok cool but is the sensor voltage good at .1?"

I can't say, as I don't recall ever checking that wire unplugged. And as you describe it ("green" and "unplugged") it's not the sensor voltage anyway. It's from the ECU -- and not normally checked that I know of.

I have used a meter there, but only with the green (ecu) and black (sensor) wires connected, and with engine warm and running. Then I hope to see rapidly changing values above and below 0.5V , mostly ranging between 0.2V (lean) and 0.8V (rich).

The rapid voltage swings above and below the 0.5V "ideal" indicate the O2 sensor and ECU are "communicating" to tweak the mixture.

Art can describe it much more accurately than I can. And tell you if 0.1v from the ECU is normal.


--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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