WS6

Toyota Soarer 1994 single wire ziconia switching sensor:

I back probed the plug coming from this sensor and which was located on the left hand side of the enigne on the exhaust manifold.

After engine has warmed up and in closed loop which we can tell this as it is in nomal cycling .

Maximum voltage is around 0.8 Volts

Minimum voltage is 0.2 volts

Cross counts were 7

Below we can see as we made the air /fuel mixture rich by a couple of sudden acceleration becuase usually this will make the system pump more fuel into the cylinder and makeing mixture rich.

The highest voltage I got was 0.85 Volts which was within manufaturer specs. each division is 0.5 Volts and time is 1 second.

Below we made the air/fuel mixture lean by reving the engine up to 3000 RPM and then a sudden deceleration will make the system to go into lean mixture. the lowest point was 0.05 volts and we can see the how it is going back to the normal cycle just at the end there .

Below we want to see how quickly the O2 sensor responds to changes and the easiest way is to do a sudden acceleration and see how quickly it changes ... we can see the voltage increasing from less than 0.2 Volts to higher than 0.8 Volts in less than 100ms which I think is a very good results

We can see that this sensor is in good working condition as all the results were within the specifications and had a response time and also clearly showed us and reflected the lean or rich conditions .