How Mass Air Flow Sensor Works How Mass Air Flow Sensor WorksĪ mass airflow (MAF) sensor works on the principle of current flow to the wire and the amount of electricity required to keep it warm.
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These issues highlight the fact that how important a MAF sensor is in the air-cleaning assembly of your car. If anyhow, the vehicle is in running condition there will be a missing in its acceleration or it will feel under power. If a vehicle’s MAF sensor is not working properly, the engine will start sputtering or cranking and will not start. It will slowly damage other components of the engine and it will also make your drive unsafe. It is recommended to not drive a car with a malfunctioning MAF.
These either disconnect the heated wire or disrupt the electric supply. The main causes of malfunctioning of a MAF sensor are the dirt particles or road debris that comes inside along with the air passing through the engine. While removing it, take care that you do not disturb the wiring otherwise there can be some electric issues with your car. Whenever required, just open the fastening screws from the air-cleaning assembly, remove the connector and take out the MAF sensor. The mass air flow sensor is usually placed in the tube of air cleaning assembly between the air filter and the throttle body. These two indicators help the ECU to determine the amount of fuel required to be injected into the EFI system of a vehicle. These flip-flop in current is converted to the proportional voltage by the integrated circuit present in the sensor and is sent to the ECU to determine the air-fuel ratio. The ECU interprets low current flow as less air entering the engine, so the ECU permits less fuel to the engine cylinder for combustion. While a low airflow removes less heat, hence temperature and resistance of the sensor get high, so the flow of current decreases. When the sensor gets cooled, its resistance decreases, and the flow of current increases, which is interpreted by ECU as a high amount of air entered to the engine, so the ECU allows more fuel to the engine cylinder. The higher airflow, the cooler the sensor gets, and vice versa. The amount of cooling is directly proportional to the flow of air. The hot wire MAF sensor measures the flow of air with a heated element, which is cooled by air flowing through it.Īs the air cools the sensor, its current flow also changes and its internal circuitry then converts the current flow into an output voltage (proportional to the air coming through) called MAF Sensor Signal Voltage. In the latest cars, a hot-wire-based mass airflow sensor also has an intake air temperature sensor (IAT) installed in the MAF sensor that measures the temperature of the air passing through the engine. Related Post: The Risks Of Driving With Mass Air Flow Sensor Unplugged Intake Air Temperature Sensor Integrated Into Mass Air Flow Sensor
The vane-type airflow sensor measures the volume of the air entering the engine by a spring-loaded mechanical flap. Two types of mass airflow sensors are used in cars, a vane meter, and a hot wire. The MAF sensor works together with the oxygen sensor and determines a precise air-fuel quantity. There is an air-to-fuel ratio for perfect combustion in a car engine called stoichiometric ratio, which is 14.7:1, which means for every 1 gram of fuel 14.7 grams of air is required, in which all the fuel is burned with no excess air.ĭetermining this exact amount of air for the perfect combustion is the job of the mass air flow sensor, where the ECU exactly knows how much air has entered the cylinder so that it lets the fuel enter the cylinder proportionally. This output voltage value is proportional to the incoming air.Īs we know that air is necessary with fuel for combustion in the engine cylinder. Here mass means quantity, as its name defines a mass air flow sensor means a sensor that measures the Quantity Of Air flowing to the engine and then converts it into a voltage value. Mass Air Flow sensor also called MAF sensor is an electronic sensor, which measures the quantity of air going to the engine in a fuel-injected internal combustion engine. Frequently Asked Questions (FAQs) What Is Mass Air Flow Sensor What Is Mass Air Flow Sensor.
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