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The signal voltage of the oxygen sensor is the most direct data reflecting the air-fuel ratio and is a very important reference data in fault diagnosis. In the closed-loop state, the working voltage of the oxygen sensor is generally 0.1-0.9V. Under normal circumstances, maintenance personnel use oscilloscope to detect or use electrical control detector to read the corresponding data stream. These diagnostic equipment are not available in many small and medium-sized repair shops.
How to repair the oxygen sensor without equipment?
Use a light-emitting diode to connect to the signal output and ground. When the oxygen sensor is working normally, the light-emitting diode will flash once when the signal voltage reaches the threshold voltage of 0.6-0.7V of the light-emitting diode in each thick and thin cycle; if the mixed gas is too thin, the light-emitting diode has not been bright; If it is too thick, the light-emitting diode will always be on; if the oxygen sensor is damaged, it will usually be on or off.
There is a simple and convenient method to check the quality of the oxygen sensor. At the signal output of the oxygen sensor, a power line is introduced from the positive electrode of the battery, and the light-emitting diode lights up, so that a 0.6-0.7V simulation can be formed in the loop Signal voltage. According to whether the working condition of the engine is improved, it can be easily judged whether the oxygen sensor is damaged.
If the performance of the oxygen sensor is poor, it is not necessary to replace it. Due to the influence of carbon deposits and lead elements in gasoline, the oxygen sensor will attach a gray-white substance to the outer wall during the long-term work, which is the common name "lead poisoning". This will affect the measurement accuracy. Therefore, the oxygen sensor should be reduced. The method is as follows: drive the vehicle, fix the connection port in the first gear, step on the accelerator, and release it suddenly after high-speed driving, and repeat multiple times. Or remove the oxygen sensor and align it with an oxygen welding gun until it is white.
Many people use light-emitting diodes as test lamps in maintenance, but it is rare to really use oxygen sensors to detect them. Ingenious use of the LED voltage characteristic of 0.6-0.7V threshold can replace the operation of reading the data stream of the oxygen sensor and setting the oscilloscope. Can quickly check the status of the air-fuel ratio. In addition, the signal voltage of 0.6 to 0.7V can be simulated to quickly diagnose the quality of the oxygen sensor.
Repeated many times under the conditions of low gear and high load to provide the best catalytic environment for the reduction of the "lead poisoning" oxygen sensor. Under the high temperature burning of the oxygen welding torch, it can also be quickly reduced.
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