The voltage goes from 0.2V to 0.8V The average is 0.5V
This oxygen sensor changed 15 times within ten seconds.
The signal tells the ECU if the car is running rich or lean. The signal changes voltage because the car switches between running rich or lean depending on the engine condition/load. The signal flucuates.The signal is working correctly if it wasnt the voltage would stay the same unless the engine is actually running rich or lean. This would be the effect not the cause.
Waveform at IDLE
The voltage goes from 0.6V to 0.1V or even less. Average is 0.3V
This oxygen sensor changed 15 times within ten seconds.
The signal is working correctly if it wasnt the voltage would stay the same unless the engine is actually running rich or lean. This would be the effect not the cause.The signal tells the ECU if the car is running rich or lean. The signal changes voltage because the car switches between running rich or lean depending on the engine condition/load. The signal flucuates
Oxygen Sensor Rich.
It should go up to 1v or 0.9V when fully rich. This waveform shows 0.7V.
If this signal didnt go high normally this would indiciate it was running lean. It should flucuate between 0.1V and 0.9V. if it didnt go high, the voltage would always be low. This signal flucuates so it is working correctly.
oxygen lean
If the signal doesnt go low this means the car is running rich all the time. This signal flucuates so it is working correctly.
This oxygen sensor took 500ms to respond to the change.
How a Zirconia oxygen sensor works
Zirconium oxide ceramic along with a platinum coated electrode and a heater make up the major internal components of the zirconia oxygen sensor. The zirconia sensor generates its own voltage and is not reliant on the ECU to operate. The main element is the zirconia ceramic, which becomes conductive for oxygen ions at about 310° C. At this temperature, zirconia dioxide develops an electrical charge as oxygen ions pass through it. Since nature is constantly seeking to balance itself, when you place zirconia ceramic between environments with different amounts of oxygen, as the oxygen passes through the zirconia to offset the balance, the zirconia will develop a slight charge. The strength of that charge will depend on how many oxygen ions pass through it. The greater the difference in oxygen between the two atmospheres, the greater the charge developed. The zirconia oxygen sensor then uses a thin platinum coating to accumulate that charge, carry it to the sensor wires and onto the ECU.
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