[tech]: how to check an o2 sensor?

[abatzis2@hotmail.com (Michael Abatzis)]

noticed that there's no fluctuation on my 16v's dpr current. figured it's 
the o2 sensor, bought the ford one, spliced it in today. still right at 8 ma 
with no fluctuation.  i grounded the end from the ecu and the current 
increased to 20 ma like it's supposed to, which i think means the ecu is 
responding correctly.  i'm thinking either the new sensor is bad also, or i 
somehow ended up with a bad solder joint (looked ok though).  how can i 
check the o2 sensor directly? i tried to get a voltage from the black wire, 
but there wasn't any.  should there be? iirc, there should be a voltage 
signal from that wire telling the ecu the mixture.  am i doing it right, or 
is there another way to check it?
tia,
-michael

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