Technician A says that pressure below atmospheric pressure is called vacuum and is measured in inches of mercury (Hg). Technician B says that a manifold absolute pressure (MAP) sensor uses a low vacuum in the sensor to determine the pressure. Who is right?

Technician A is Right and Technician B is wrong

Explanation:

Technician A is right, If we take standard atmospheric pressure as reference then pressure below atmospheric pressure is known as "vacuum" and is usually measured in inches of mercury Hg. On the other hand, the pressure above the atmospheric pressure is simply called "pressure".

Technician B is wrong, The MAP sensor compares manifold vacuum to a perfect vacuum to determine the pressure.The manifold absolute pressure (MAP) sensor is used in the electronic control system of an internal combustion engine.

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