Corrado V6-2792cc 2.8L DOHC (1992)
Oxygen Sensor: Description and Operation
Oxygen Sensor Circuit
PURPOSE
The Heated Oxygen Sensor measures the oxygen content in the exhaust and sends a voltage signal to the ECM.
LOCATION
The Heated Oxygen Sensor is mounted in the catalytic convertor, upstream of the core.
CONSTRUCTION
The sensor consists of a steel housing, heating stem (element), sensor tip and its protective sleeve. The sensor tip itself is made from a platinum
covered zirconium-oxide pipe.
OPERATION
The Heated Oxygen Sensor produces a measureable voltage by comparing the amount of oxygen in the exhaust gas with the amount in the ambient
air.
The sensor operates within a temperature range of approx. 545 - 1530°F (285 - 850°C). It is electrically heated to reach its operating temperature
as fast as possible. When the ignition is turned ON, current is sent to the PTC (positive temperature coefficient) resistor (heating stem) whose
resistance increases as temperature increases.
Exhaust gases reach the outer surface of the Heated Oxygen Sensor tip via the openings in the protective sleeve. Ambient air reaches the sensor's
inner surface via channels. The differance in oxygen content produces a voltage read by the ECM.
