Pickup 2WD L4-2559cc 2.6L SOHC (4ZE1) (1993)
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Oxygen Sensor: Description and Operation
Heated Oxygen Sensor
PURPOSE
The oxygen sensor measures the oxygen content in the exhaust and sends a voltage signal to the Engine Control Module (ECM).
CONSTRUCTION
The sensor consists of a steel housing, sensor tip and its protective sleeve. The sensor tip itself is made from a platinum covered zirconium-oxide
pipe. The sensor is also equipped with a ceramic heater.
Oxygen Sensor Operation
OPERATION
This 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 only within a certain temperature range of approx. 285 - 850°C (545 - 1530°F).
The exhaust gases reach the outer surface of the 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.
A heater is provided to allow the sensor to reach operating temperature faster, therefore allowing the ECM to control the A/F mixture sooner.
