just wondering if anyone here knows the voltage range of the fit's O2 sensor.
i pretty sure that it's just a regular narrowband sensor (0V-1V) but im not 100% sure.
can someone confirm? if not then ill just have to check with a multimeter.

 

oh yeah im talking about the primary sensor.

 

Sorry for the weird format but this is copied from the manual and it is hard to get it to work right.


Primary Heated Oxygen Sensor (Primary HO2S), (Sensor 1) Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2)

The HO2S detects the oxygen content in the exhaust gas and sends voltage signals to the ECM/PCM. Based on these signals, the ECM/PCM controls the air fuel ratio. When the oxygen content is high (that is, when the ratio is leaner than the stoichiometric ratio), the voltage signal is lower. When the oxygen content is low (that is, when the radio is richer than the stoichiometric ratio), the voltage signal is higher.

0.0-1.25 V
At idle speed:
about 0.1-0.9 V

EDIT: sorry found this in another section of the same manual:

With throttle fully opened from idle with fully warmed up engine: about 0.6 V
With throttle quickly closed: below 0.4 V


So now we have a REAL CHEAP way of checking if you are running lean or rich based on the voltage at the primary HO2S.

 

thanks. so it has a range of 0-1.25V but its operating range is 0~1V right?

 

nvm i got it.
rep to claymore

 

I bet "someone" could put a digital multimeter and finely graduated rheostat into that circuit and could control their A/F mixture for about $5.00.

 

not possible, the ecu will fight it by adding/subtracting fuel within less than a second