Workshop Repair Manuals

Volvo Workshop Manuals

[PREV PAGE] [NEXT PAGE]

volvo Workshop Repair Guides


940 L4-2.3L SOHC VIN 88 B230F (1992)

Sensors and Switches > 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 2209

Page 1
background image

Oxygen Sensor (Lambda Sond): Description and Operation
Bosch

Oxygen Sensor (Lambda Sond)

PURPOSE

Under normal conditions, the optimum air/fuel mixture ratio is 14.7kg air to 1kg fuel. The ratio is monitored by measuring the exhaust gas oxygen
content. The oxygen sensor senses the oxygen content in the exhaust and sends a voltage signal to the fuel injection ECU. 

OPERATION

The oxygen sensor will only operate above a certain temperature, approx. 545°F (285°C). It is electrically heated so that it reaches operating
temperature quickly. When the ignition is turned ON, current is sent to the Positive Temperature Co-efficient (PTC) resistor (heating stem) whose
resistance increases as temperature increases. This provides a short warm up time and keeps the sensor at the correct operating temperature when
the exhaust gas temperature is low.

Sensors and Switches > 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 2209

[PREV PAGE] [NEXT PAGE]