The Mass Air Flow Sensor in a Nissan Altima measures the amount of air entering the engine, allowing the powertrain control module to adjust fuel injection for efficient combustion. The electronic Mass Air Flow Sensor finds its place in the Altima's intake tract. Moreover, it transfers an airflow signal to the Nissan computer along with other sensor data so that the mixture remains correct. Two principal styles of the Mass Air Flow Sensor can be found on Altima models, the hot wire sensor and the vane meter. When the hot wire Mass Air Flow Sensor works, it places a heated wire in the airstream. Cooling by incoming air changes the electrical current needed to hold temperature, and that variation represents airflow. The Mass Air Flow Sensor of the vane meter type is made up of a spring-loaded flap that opens in the direction of airflow. The potentiometer converts the flap position to an electrical output. This change of position is applied to determine the mass flow of air into the engine. Both serve the same purpose for Nissan Altima engines. The hot wire design has no moving parts. The vane meter has a mechanical door that can stick or wear out.
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