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Voltage on loom when oxygen sensor removed

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GixerMark
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Joined: 24 Oct 2016
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PostPosted: 13:14 - 09 Nov 2016    Post subject: Voltage on loom when oxygen sensor removed Reply with quote
On my YBR250 which is running rich, I am finding that the oxygen sensor when removed I still have a voltage of 0.101V on the signal to the ECU.
I don't know if I should be getting a voltage here once the sensor has been removed or should I drop to 0volts. Could anyone help??
It is a four wire sensor and I have 12volts for the heating coil .
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uberkron
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Joined: 12 Nov 2012
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PostPosted: 18:39 - 09 Nov 2016    Post subject: Reply with quote
You are seeing a reference voltage. All is normal.
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GixerMark
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PostPosted: 22:59 - 09 Nov 2016    Post subject: Reply with quote
So the fault would be with the 02 sensor then and not the ECU?
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uberkron
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PostPosted: 08:34 - 10 Nov 2016    Post subject: Reply with quote
If it is a switching type i would expect 0.6 volt when up to temperature and lean, ie on overrun.
If it is a wideband type 1.5 volts or so on over run.
The voltage fluctuates fairly quickly if the sensor is working and the mixture is close to ideal.
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GixerMark
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PostPosted: 10:11 - 10 Nov 2016    Post subject: Reply with quote
But I don't get any change of voltage and the bike is drinking like a fish. But it's strange that I'm not getting any error with this running so rich as my spark plug are coating up.
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arry
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Joined: 03 Jan 2009
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PostPosted: 13:56 - 10 Nov 2016    Post subject: Reply with quote
GixerMark wrote:
But I don't get any change of voltage and the bike is drinking like a fish. But it's strange that I'm not getting any error with this running so rich as my spark plug are coating up.


With the sensor removed you'd expect the 0.1v reading you're getting - as said that's the 'reference voltage'. Back within the exhaust, with the sensor up to temperature, you'd expect it to fluctuate between 0.1v and circa 1v depending on the mixture. If you rev the bike and then let it run down on the overrun, the mixture will lean out, and you'd expect the voltage to drop down to reference again.

The fact you're seeing a signal change from it probably means it's OK. You may want to look at other reasons why the ECU won't go into closed loop - and one of those might be temperature sensor. With that said - I'm not familiar with this bike nor its inputs in the fuel cycle - but this is what I've gleaned more generically on O2 sensors over the years.
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