The powertrain control module uses the Toyota Matrix Mass Air Flow Sensor to monitor the amount of air entering the intake so that it can supply the right amount of fuel. Mass Air Flow Sensor features a heated wire placed in the airstream. As the air flows by, it cools the wire. The Mass Air Flow Sensor circuitry measures the electrical current needed to keep the wire at a set temperature. This change is converted to an airflow signal for the control module. This feedback allows the module to adapt injector on-time to maintain the proper air-to-fuel ratio under all driving conditions. Whenever the sensing wire gets dirty or contaminated, it can affect the reading. Thus, that can lead to hesitation, stalling, or a mixture running rich or lean. This will cause a DTC to set and the check engine light to come on. Ultimately, it is important for the air path prior to the Toyota Matrix Mass Air Flow Sensor to be sealed so unmetered air will not create a lean condition. The Mass Air Flow Sensor in the Toyota Matrix is essential in keeping the engine operation of the Toyota Matrix running smoothly.
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