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

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

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

如何检查判断氧传感器故障（How to check and determine the oxygen sensor fault） Oxygen sensor performance inspection is divided into three cases, one is to detect sensor resistance; two is to measure the oxygen sensor voltage output signal changes; three is to observe the color of the oxygen sensor appearance. Check the oxygen sensor resistance. When the engine reaches the normal temperature, unplug the wire connector of the oxygen sensor with the resistance between the resistance meter terminal detecting sensor values of the resistance value should be consistent with the specific vehicle standard (usually 4-40), such as the resistance value does not meet the requirements, you should replace the oxygen sensor. The detection voltage output signal of the oxygen sensor is installed in the oxygen sensor wire connector, a wire, drawn from the signal terminal starting the engine, the engine to normal operating temperature, and maintain the engine idling. At this point, the output voltage of the oxygen sensor signal terminal is detected by a voltmeter. When the pull wire of a cylinder (open fire), the oxygen content in the exhaust gas will decrease, if the voltage indicator increased, indicating good sensor performance (oxygen sensor output voltage is generally between 0.2-0.9V, the change in the range of about 0.5V). Should pay attention to when testing: not short-circuit sensor is connected with the column; the positive and negative coupling cannot be mistaken, voltage meter probe connected to the negative battery anode, cathode probe connected to the sensor signal line. When examining an oxygen sensor, it is sometimes possible to know the cause of the fault by observing the color of the top of the oxygen sensor. The normal color of the top of the oxygen sensor is light gray. Once the color of the top of the oxygen sensor changes, it indicates that there is a fault or fault in the oxygen sensor. Black top oxygen sensors are caused by carbon contamination and should be removed to remove