如何检查判断氧传感器故障（How to check the fault of oxygen sensor）.doc

如何检查判断氧传感器故障（How to check the fault of oxygen sensor）The performance of oxygen sensor is divided into three conditions, one is detecting the sensor resistance. The second is the change of the oxygen sensor voltage output signal. The third is to observe the appearance of oxygen sensor.Check the oxygen sensor resistance. When the engine temperature to normal after, remove the oxygen sensor wire connector, with resistance meter to detect pressure sensor terminal, the resistance value between the resistance value should meet specific models of standard requirements for 4 - (40 Ω), such as the resistance is not in conformity with the requirements, it should be replaced oxygen sensor.Oxygen sensor voltage output signal detection, it is packed in oxygen sensor wire connector, a wire from the signal terminal, start the engine, the engine at normal operating temperature, and maintain the engine idle speed running. At this time, the output voltage of the oxygen sensor signal terminal is detected by the voltmeter. When pulled out of a cylinder high subsection firewire (fire), oxygen content in exhaust will decline, if the voltmeter the voltage was increased, indicating that the sensor performance good (oxygen sensor output voltage generally between 0.2 0.9 V, the scope of its change at around 0.5 V). Attention should be paid to the test: no short-circuit sensor connection; The positive and negative connector cannot be mistaken. The negative electrode of the voltage meter is connected to the negative pole of the battery, and the positive pole is connected to the sensor signal line.During inspection of the oxygen sensor, sometimes the top color of the oxygen sensor can also be used to understand the fault. The top normal color of oxygen sensor is light grey. Once the top color of the oxygen sensor has been detected, it indicates that the oxygen sensor has a malfunction or malfunction. The black top oxygen sensor is caused by carbon pollution and should be removed after being rem