ilmanmassamittari

Ilmanmassamittari, often abbreviated as MAF sensor, is an automotive component that measures the volume or mass of air entering the engine. This information is crucial for the engine control unit (ECU) to determine the correct amount of fuel to inject for optimal combustion. Without an accurate reading from the MAF sensor, the engine's performance, fuel efficiency, and emissions can be negatively affected.

There are several types of MAF sensors, with the hot-wire and hot-film designs being the most common. In a hot-wire MAF sensor, a heated wire is exposed to the incoming air. As air flows past, it cools the wire. The ECU then measures the amount of electrical current required to maintain the wire's temperature, which is directly proportional to the mass of air. A hot-film sensor works similarly but uses a heated film element instead of a wire.

Symptoms of a malfunctioning MAF sensor can include a rough idle, hesitations during acceleration, decreased fuel economy, illuminated check engine light, and even stalling. If the MAF sensor is not functioning correctly, it can lead to a range of drivability issues. Diagnosis typically involves checking for diagnostic trouble codes (DTCs) related to the MAF sensor and performing visual inspections and electrical tests. Cleaning a dirty MAF sensor with specialized MAF cleaner can sometimes resolve issues, but replacement is often necessary if the sensor is damaged or worn out.