What is the difference between a heated resistor MAF sensor and a hot wire MAF sensor?
What will be an ideal response?
A heated resistor airflow sensor has a resistor or electric grid in the air intake that is heated to a certain temperature whenever the key is on. As the engine is accelerated, more air flows across the resistor to cool it. More current is required to keep the resistor at the same temperature. The computer uses this signal to determine the amount of fuel to inject into the cylinder.
In a hot wire MAF sensor system, a sensor located next to a hot wire tells the computer the temperature in the intake system. When the ignition is on, the computer heats the wire to a specified temperature above the temperature of the air in the intake manifold. When the engine is accelerated, fresh air cools the wire and more electrical current is provided to heat it up. The computer calculates how much air is flowing into the engine by interpreting the signal generated by this action.
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