Technician A says that a MAF sensor actually measures the density and amount of air flowing into the engine. Technician B says a that hot wire MAF sensor uses the electronics in the sensor itself to heat a wire 70°C above the temperature of the air entering the engine. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct because a MAF sensor measures the mass of air entering the engine, which involves both the density and volume of air. Technician B is also correct because a hot wire MAF sensor maintains a wire at a constant temperature above the incoming air temperature to measure air mass flow.

Technician a Says That a MAF Sensor Actually Measures the Density