929 V6-3.0L DOHC (1993)
Oxygen Sensor: Description and Operation
Oxygen Sensor
Oxygen Sensor
Oxygen Sensor Operation
PURPOSE
System uses 2 sensors to detect exhaust gas oxygen content and signal the PCME. With this signal, PCME maintains proper air/fuel ratio by
controlling fuel injection quantity and purge control solenoid valve operation.
LOCATION
One sensor each in exhaust pipe below exhaust manifolds.
OPERATION
PCME determines air/fuel ratio based on oxygen sensor voltage signal and makes appropriate adjustments to maintain optimum ratio of 14.7:1.
Sensors consist of a hollow zirconia ceramic element with a platinum coating on inside and outside surfaces. The open end of the element is
exposed to the atmosphere and its surface is connected to the PCME. The closed end protrudes into the exhaust stream and its surface is connected
to ground. Oxygen reacts with the platinum surfaces at high temperatures. When there is a difference in the amount of oxygen reacting with the
inner and outer surfaces, a voltage potential is generated. The voltage range is approximately 0.1-1.0V. Voltage increases when the concentration
