Question

airflow measurement is being discussed. technician a states that the speed density method relies on several engine sensors and is then calculated based on a preprogrammed data map. technician b states that in types with a mass airflow (maf), there can be no leaks in the intake tube or manifold after the sensor for the reading to be accurate. who is correct? a. technician a b. technician b c. both technician a and technician b d. neither technician a nor technician b

Explanation:

• Technician A: The speed - density method uses engine speed (from the crankshaft position sensor), manifold absolute pressure (MAP) sensor, and engine temperature (ECT) sensor. The engine control unit (ECU) then calculates the air - flow based on a pre - programmed data map. So, Technician A is correct.
• Technician B: In a mass air flow (MAF) sensor setup, the MAF sensor measures the mass of air entering the engine. If there are leaks in the intake tube or manifold after the MAF sensor, unmeasured air will enter the engine, and the MAF sensor reading (which is used by the ECU to calculate fuel injection, etc.) will be inaccurate. So, Technician B is also correct.

Answer:

C. Both Technician A and Technician B