Oxygen Sensor analog multi meter tests

Well I found my old notes, they came from Autozone of all places. They have a real nice write up on testing O2 seonsors for 1984 to 1998 Jeeps! It is very useful info that I have not found elsewhere:

http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/15/22/9d/0900823d8015229d.jsp

BUT, According to page 1, Low volatge is low O2, which is rich fuel mix, and high voltage is lean fuel, high O2.

BUT page 2 says the opposite, it says pull a vacuum hose after the throttle body, voltage should drop to apx 0.12 volts due to a lean mixture, but doing that should create a high O2 (which is lean fuel) reading which page one says should read high volatge, so they can't both be right.

It also says "and using a propane enrichment tool it should jump to 0.9 volts."

So now I am wondering which is right, page 1 or page 2?

Either way this is a great way for us to test those O2 sensors with a voltmeter (analog meters work best on this test!) that we have had questions about from time to time as it says a rapidly swinging signal is a sign of a working O2 sensor and a stuck signal means a bad sensor. The test procedure at the link site also details some other problems the voltage readings can confirm!

Mine drops to about .2 volts for 4 seconds during rapid deceleration from 3500 rpm to 700 rpm (in Park). Other than that (i have not tried a propane tool) it runs from 0.33 to 0.77 volts at idle up to about 3500 rpm, and it takes about 1 second to swing from one side to the other, or 2 seconds to go full cycle from high to low and back to high. I used a Radio Shack analog FET Multimeter (one of the really good ones).

Any body ever confirmed which one of those is right, page 1 or 2? Anyone got a propane tool and analog meter handy?

Last minute edit, this site has some good info as well, it says page 2 is right:

http://www.ibmwr.org/ktech/O2-sensor-testing.shtml

This one says page 1 is right!

http://www.mr2.com/TEXT/O2_Sensor.html

Ecomike

there are a few good write ups about this on the net that I have seen if you google it they will explain in more detail how what where and why you test a O2 sensor as well as what readings meen. ive used a o2 sensor in a few cases to adjust carbs when doing tune ups

This one says page 2 is right:

http://www.asashop.org/autoinc/dec2002/mech.htm

It seems to be an authorative source:[SIZE=-1] David W. Gilbert is an Associate Professor of Automotive Technology at Southern Illinois University Carbondale. He holds a Master of Science degree from Oklahoma State University and is also ASE certified as a master automotive technician, master engine machinist and advanced engine performance specialist (L1).

It also says the HEGO or HO2S sensors run the heater all the time and keep the sensor at 1292 to 1472 F. OUCH!
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