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Topic: HO2S and idle (Read 320 times) |
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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HO2S and idle
« on: May 11th, 2007, 1:13pm » |
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Hello,
Should I notice a difference in the idle on a 2.0 16v if I disconnect the upstream HO2S sensor?
I disconnected the plug on mine and couldn't tell the difference.
I tried getting a reading from the sensor with a multi meter, but I'm not 100% sure if I checked the correct wires. It seemed to flatline at around 0v. (Could someone confirm which two wires are signal/ground?)
Thanks
Kjetil
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: HO2S and idle
« Reply #1 on: May 11th, 2007, 1:22pm » |
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hi there
black and grey (i think). the 2 white are for the heater.
hth
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: HO2S and idle
« Reply #3 on: May 11th, 2007, 1:29pm » |
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Yep, those were correct. It fluctuates between 0.0 and 0.45 approx when I rev it. Steady 0.01 when idle.
Edit:
I see the main page says this about the HO2S system:
Quote:A sensor should read high (0.6 to 0.9 volts) or low (0.1 to 0.4 volts.) It should never read 0.0 volts.
A Front sensor HO2S11, 21, should be showing a regular 'switch' from high to low, at a frequency of about .7 seconds. Periods of 'flatlining' ie no switching, means that the sensor may be deteriorating and may need to be changed if DTCs are being generated. |
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Mine seems to switch, but only between zero and low, not between low and high.
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martin_rowe
Full Member
I love YaBB 1G - SP1!
Posts: 879
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Re: HO2S and idle
« Reply #4 on: May 11th, 2007, 1:55pm » |
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a 1v sensor should oscilate either side of the 0.5v centre line, low output voltage indecates weak mixture / air / vacuum leak. measure with engine at 'steady' speeds, eg idle or holding at 3k.
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