Air flow sensor - one of the important sensors of the EFI engine.
Electronic control gasoline injection engine in order to obtain the best concentration of mixture under various operating conditions, it is necessary to correctly measure the amount of air sucked into the engine at every moment, which is the main basis for ECU calculation (control) of fuel injection. If the air flow sensor or line fails, the ECU can not get the correct intake gas signal, it can not control the injection amount normally, which will cause the mixture to be too thick or too thin, so that the engine is not running normally. There are many types of air flow sensors for electronic control gasoline injection system, and the common air flow sensors can be divided into blade (wing) type, core type, hot wire type, hot film type, Karman vortex type and so on.
5 types of air flow sensor faults
Air flow sensor is a key component in automobile engine management system, its failure will lead to engine performance degradation, fuel consumption increase, and even affect the safety of the vehicle. Five common faults of air flow sensors and their manifestations are as follows:
Abnormal air total flow and voltage : this may lead to unstable idle speed, weak acceleration, increased fuel consumption and other problems.
The total air flow voltage is too high or too low : This indicates that the sensor may not be measuring the flow correctly, which can affect the performance of the engine.
Too thin or too thick gas mixture : This can lead to erratic engine idling, weak acceleration, increased fuel consumption and abnormal exhaust.
Inaccurate signal, signal interruption or signal instability : These problems may result in too much or too little fuel injection, affecting the normal operation of the engine.
If the air filter element is not replaced for a long time or the use of inferior filter element , it will lead to the accumulation of dust inside the air flow sensor, affecting its detection accuracy and service life.
In order to diagnose and resolve these faults, the following methods can be taken:
Measure the output voltage data of the engine running : in the idle state of the engine, the dynamic signal voltage of the plug signal end should be between 0.8 and 4V; When accelerating to full load, the voltage signal should be close to 4V.
Use a multimeter to test the output voltage of the sensor : the normal voltage value should be 5V, you can test the response by blowing air into the sensor.
Unplug the power plug of the air flow sensor when the engine is running : judge whether the sensor is working normally by observing the change of the engine.
Use the fault diagnosis instrument to read the fault code : and handle the fault according to the displayed fault code.
If the air flow sensor is found to be faulty, it should be repaired or replaced in time to avoid greater impact on engine performance.
Air flow sensor repair method
Repair methods for air flow sensors include inspection and cleaning, sensor replacement, repair of damaged parts, and a complete inspection.
Check and clean the air flow sensor : periodically check whether the connection cable of the air flow sensor is loose or damaged. If any problem is found, repair or replace it in time. At the same time, cleaning the air flow sensor can effectively improve its accuracy. Use a special tool to remove the sensor, clean it with a cleaner with good cleaning ability, wipe it clean after cleaning and then install it on .
Replace the air flow sensor : If the air flow sensor itself fails, a new sensor needs to be replaced. This usually involves removing the original sensor and installing a new one .
Repair damaged parts : If the hot wire or hot die of the air flow sensor is burned, cracked, or dirty, you need to replace the faulty part. This may involve replacing hot wires, hot molds, or cleaning the sensor surface to remove dust buildup and dirt .
Complete inspection : If there is a problem with the air flow meter, it is best to have a complete inspection, as the problem may involve more complex system issues. If there is a problem with the air flow meter, the repair may not be as reliable as replacing it with a new matching part .
In short, the air flow sensor is essential for the normal operation of the engine, and should be dealt with in time when there is a failure to ensure that the engine performance and emissions meet the standards .
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