o2 sensor measurement
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Freshman User
Joined: Feb 2001
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o2 sensor measurement
I was connecting my dvm to read O2 sensor output and did get 1.3 volts, white leads. there were 2 white leads and 1 black, so I am not sure how to connect, this was the only combination where I got any output.
But the book explains do not try and measure the output of this sensor or it will be destroyed.
So would like to know if thats true and how to measure the output? white to white? seems 1.3 volts is outside the range of the sensor. is there a web page that shows how it is used? I do understand electronics so maybe that would help my understanding.
but would like to make a determination if this sensor is the cause of my poor mileage
and proper way to read output.
But the book explains do not try and measure the output of this sensor or it will be destroyed.
So would like to know if thats true and how to measure the output? white to white? seems 1.3 volts is outside the range of the sensor. is there a web page that shows how it is used? I do understand electronics so maybe that would help my understanding.
but would like to make a determination if this sensor is the cause of my poor mileage
and proper way to read output.
Senior User
Joined: Jun 2002
Posts: 263
Likes: 1
From: British Columbia
o2 sensor measurement
The two white wires are for the heater circuit of the O2 Sensor. One has 12v and the other is grounded. The black wire is the signal wire.
You will damage the sensor if you use a older style low impedence meter. A modern high impedence meter such as the one you used is OK.
You need either a graphing DVOM or a lap scope to do a proper reading as a standard dvom is too slow to follow the signal. Once an O2 sensor reaches closed loop it will swing back and forth from .100 to .900+ volts. It will do this about 2-3 times per second.
Basic spects for all zircon O2 sensors:
Min voltage less than .100V
Max Voltage more than .900V
reaction time should be about 10ms or less
20 cross counts or more for multiport
10-15 for tbi
5-10 for feedback carb.
Nick from the frozen north
1974 F-250 4X4
soon to be 429
dana 60 front and rear
You will damage the sensor if you use a older style low impedence meter. A modern high impedence meter such as the one you used is OK.
You need either a graphing DVOM or a lap scope to do a proper reading as a standard dvom is too slow to follow the signal. Once an O2 sensor reaches closed loop it will swing back and forth from .100 to .900+ volts. It will do this about 2-3 times per second.
Basic spects for all zircon O2 sensors:
Min voltage less than .100V
Max Voltage more than .900V
reaction time should be about 10ms or less
20 cross counts or more for multiport
10-15 for tbi
5-10 for feedback carb.
Nick from the frozen north
1974 F-250 4X4
soon to be 429
dana 60 front and rear
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