The Narrowband sensor produces a voltage of approximately 0.8v+ when rich, quickly dropping to 0.2v or lower when lean .
To maintain the correct AFR, the ECU will alter the air fuel mix slightly in each direction and makes sure the changes flip the output voltage between rich and lean.
When working correctly, the measured signal from the lambda sensor flicks between 0.8v and 0.2v at a steady rate from the mixture alterations, but the response time is too slow for engine speeds over 3-4k rpms. Above these speeds, the ECU works in open loop which is a default rich condition, and these may be subject to the long term fuel trims available in OBD2 ECUs, when the ECU has measured a factor to correct the AFR.
Now, I don't believe the ecu is obd2 but I would imagine that the o2 could benefit you in closed loop just for economy purposes.
Is there a place in the software to turn off o2 correction?
Last edited by Matteson; 01-13-2015 at 12:37 AM.