Question

A MAP sensor is being discussed. Technician A says that many MAP sensors act as a barometric pressure sensor when the ignition switch is turned off. Technician B says that on many MAP sensors the signal voltage should increase when the vacuum at the sensor decreases. Who is right?

Answer 1

Answer:

Technician B

Explanation:

The full meaning of MAP sensor is Manifold Absolute Pressure sensor. An MAP sensor is found in the engines of an automotive system (Car). And the system has to be a fuel injected system.

The functions of the MAP sensor are:

a. It helps to check the quantity of air that is moving through the engine of the car.

b. It helps to calculate the density of air in the automotive system.

c. It aids in the determination of air to fuel ratio in the car

d. It helps to regulate the amount of fuel entering the chamber of combustion.

MAP sensors creates a signal that is equal to the quantity of vacuum in the tubes through which the mixture of fuel and air flows through which also known as the intake manifold. Therefore, on many MAP sensors, when the vacuum at the sensor decreases, there should be an increase in the signal voltage.