how to check if an O2 sensor is good or bad with a multimeter?
06-12-2003, 03:54 PM
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how to check if an O2 sensor is good or bad with a multimeter?
a fellow HT member informed me of this. I was wondering anyone can teach me in depth?
06-13-2003, 05:33 AM
#3
Re: how to check if an O2 sensor is good or bad with a multimeter? (Loveless)
When its running properly it should swing quickly back & forth between maybe 0.2v and 0.8v. An oscilloscope is best, but if your meter can react quickly you might be able to see it. It's actually better with an analog meter. My Fluke 179 reacts a lot quicker than the average radioshak meter, & it has a bar-graph on the display that's reacts quicker yet.
If it stays high or stays low, it might be bad, or this might be caused by other EFI problems. The common way for a sensor to fail is that it gets sluggish to respond. It still oscillates in the proper range, but maybe every second or slower, instead of several times per second like it should.
Does this make sense - is it what you're looking for??
If it stays high or stays low, it might be bad, or this might be caused by other EFI problems. The common way for a sensor to fail is that it gets sluggish to respond. It still oscillates in the proper range, but maybe every second or slower, instead of several times per second like it should.
Does this make sense - is it what you're looking for??
06-13-2003, 06:52 AM
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Re: how to check if an O2 sensor is good or bad with a multimeter? (JimBlake)
yes that helped
next question: which two wire do I tap to? I think the o2 sensor are consisted of 4 wires.
btw: am I suppose to jack up the car, start it, and crawl under it with a multimeter?
next question: which two wire do I tap to? I think the o2 sensor are consisted of 4 wires.
btw: am I suppose to jack up the car, start it, and crawl under it with a multimeter?
06-13-2003, 07:51 AM
#5
Re: how to check if an O2 sensor is good or bad with a multimeter? (Loveless)
I'd have to look up the wire colors - I think someone put em up here somewhere, try searching. Two of them are the heater, they'll just be 12v. Yours is '97? Might be different even if I looked it up for mine.
Best might be to use a thin probe into the back of the plug where the wiring harness plugs into the ECM. The plugs under the car should be waterproof so you can't tap them without unplugging it & making up a breakout box.
Best might be to use a thin probe into the back of the plug where the wiring harness plugs into the ECM. The plugs under the car should be waterproof so you can't tap them without unplugging it & making up a breakout box.
06-13-2003, 01:16 PM
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Re: how to check if an O2 sensor is good or bad with a multimeter? (JimBlake)
again, thanks for the info
I tried searching but didn't find the thread in regard to this
let me know when you get the color code for this, thanks
I tried searching but didn't find the thread in regard to this
let me know when you get the color code for this, thanks
06-14-2003, 06:43 AM
#7
Re: how to check if an O2 sensor is good or bad with a multimeter? (Loveless)
On my '95 Integra, it's D14 on the ECM, white/red.
On my '98 Accord, the 2 sensors are:
primary, C16, white & secondary, A23, white/red.
All of them (I think) are the white wire of the sensor itself.
Since your Integra is OBD-II it's probably different from mine, but you could check the white wire of the sensor.
On my '98 Accord, the 2 sensors are:
primary, C16, white & secondary, A23, white/red.
All of them (I think) are the white wire of the sensor itself.
Since your Integra is OBD-II it's probably different from mine, but you could check the white wire of the sensor.
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