I'm stuck with things I can not trust. Toyota oxygen sensor before and after catalytic converter shows unreasonable. I've read one there and can not remember what I did wrong. maybe some sharp person here who can help me.
blue is before cat and red is after. This is what I get. heated or not. There are zirconia sensors both before and after. but it was something special (check picture)
I also have a file from my measurement that I have added. I have not uploaded it to the library as I am very skeptical if I have done the right thing. feel free to provide feedback so maybe this can be resolved.
Hello,
From air/fuel sensor you can measure -0.36 mA current at air -fuel ratio 13 ,0 mA at fuel-air ratio 14.7, ,0.36 mA at fuel-air ratio 17.7.This current is pumped by ECU in sensor circuit to keep voltage at 0.4 v between AF+ and AF-,better use a scan tool to read air/fuel ratio,even with K2 clampmeter you will have a lot of noise.
Best regards