OxygensensorAs the most direct data reflecting the air fuel ratio, the signal voltage of is a very important reference data in fault diagnosis.In closed loop state, oxygensensorThe working voltage of is generally 0.1-0.9V.Normally, the maintenance personnel use an oscilloscope to detect or use an electronic 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?
Connect a light-emitting diode to the signal output terminal and ground.When the oxygen sensor works normally, the LED will flash once when the signal voltage reaches the threshold voltage of 0.6-0.7V of the LED in each rich lean cycle;If the mixture is too thin, the LED will not light up all the time;If the mixture is too rich, the LED will be on all the time;If the oxygen sensor is damaged, it will stay on or not.
There is also a simple and convenient way to check the quality of the oxygen sensorBatteryA power line is introduced to the positive pole, and the LED lights up, so that an analog signal voltage of 0.6-0.7V can be formed in the circuit.according toengineIt is easy to judge whether the oxygen sensor is damaged if the working condition of is improved.
If the oxygen sensor has poor performance, it is not necessary to replace itgasolineThe influence of medium lead element will attach a gray white substance on the outer wall during long-term work, which is commonly known as "lead poisoning". This will affect the measurement accuracy.Therefore, the oxygen sensor should be restored.The method is as follows: drive the vehicle, fix the connection port at the first gear, press the accelerator to the bottom, release it suddenly after driving at high speed, and repeat for many times.Or remove the oxygen sensor and align it with the oxygen welding gun until it is white.
Many people use LED as test lamp in maintenance, but it is rare to use it to detect oxygen sensor.Clever use of the 0.6~0.7V threshold voltage characteristics of the LED can replace the operation of reading the data stream of the oxygen sensor and setting the oscilloscope.It can quickly check the condition of air fuel ratio.In addition, simulating the signal voltage of 0.6~0.7V can quickly diagnose the quality of the oxygen sensor.
Repeated under low gear and high load conditions, it provides the best catalytic environment for the reduction of "lead poisoning" oxygen sensor.It can also be quickly reduced under the high temperature burning of the oxygen welding gun.
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