Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Powertrain Management > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor (Lambda Sond) <--> [Oxygen Sensor] > Component Information > Description and Operation > Bendix > Page 4696
Operation Of Oxygen Sensor (Lambda Sond)
This particular model of oxygen sensor is known as a "semiconductor sensor". Its resistance changes depending on the amount of oxygen
The sensor operates only within a certain temperature range of approx. 392 - 1530°F (200 - 850°C). It is electrically heated to reach its operating
When the ignition is turned ON, current is sent to the Positive Temperature Co-efficient (PTC) resistor R1 (heater) whose resistance increases as
The exhaust gases reach the outer surface of the oxygen sensor tip via the openings in the protective sleeve, this changes the resistance in the
The sensor signal voltage is in direct proportion to the amount of oxygen in the exhaust gases. This depends on the air/fuel ratio. A "Lambda"
The voltage signal sent by oxygen sensor varies between 0.1 - 1.2V. The fuel injection ECU uses this information to adjust the amount of fuel
The oxygen sensor signal gets disregarded by the ECU at and immediately after start-up and at full load (throttle switch position).
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