Technician A says that a MAF sensor is a high-authority sensor and is responsible for determining the fuel needs of the engine based on the measured amount of air entering the engine. Technician B says that a cold wire MAF sensor uses the electronics in the sensor itself to heat a wire 20°C below the temperature of the air entering the engine. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct because the Mass Air Flow (MAF) sensor is indeed a high-authority sensor that measures the volume and density of air entering the engine to determine the correct fuel mixture. Technician B is incorrect because a cold wire MAF sensor does not exist; the term likely refers to a hot wire MAF sensor, which heats a wire to a specific temperature above the incoming air temperature, not below.

Technician a Says That a MAF Sensor Is a High-Authority