What is the function of a vehicle's mass air flow sensor?

[StMalachi]

The function of a vehicle's mass air flow sensor is to measure the amount of air entering the engine and transmit this data to the engine control unit (ECU). The ECU uses this data to determine the appropriate fuel injection quantity. As one of the crucial sensors in an electronic fuel injection system, the mass air flow sensor converts the intake air volume into electrical signals sent to the electronic control unit, serving as one of the fundamental signals for fuel injection determination. It is essentially a sensor that measures the air flow entering the engine. Symptoms of a faulty mass air flow sensor include: 1. Decreased engine power; 2. Difficult engine starting and unstable operation; 3. Unstable idle speed; 4. Poor vehicle acceleration; 5. Intake manifold backfiring; 6. Black smoke emission from the exhaust pipe.