Question 1

The MAP sensor is used by the PCM to diagnose the ________ system. A)O₂ sensor B)EGR C)AC D)Injector

Accepted Answer

The MAP (Manifold Absolute Pressure) sensor is primarily used by the Powertrain Control Module (PCM) to monitor and diagnose issues related to the EGR (Exhaust Gas Recirculation) system. It helps in determining the amount of EGR flow into the intake manifold.

Question 2

A P0108 DTC is being discussed. Technician A says that a damaged or missing MAP sensor O-ring could be the cause. Technician B says the MAP sensor signal circuit shorted-to-ground could be the cause. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Technician A only

Accepted Answer

Technician A only&#10;

Question 3

A P0106 DTC is being discussed. Technician A says a damaged or missing MAP sensor O-ring could be the cause. Technician B says a defective MAP sensor could be the cause. Who is right?&#10;A)Technician A only&#10;B)Technician B only&#10;C)Both technicians A and B&#10;D)Neither technician A nor B

Accepted Answer

Both technicians A and B are correct. A damaged or missing MAP (Manifold Absolute Pressure) sensor O-ring can cause air leaks affecting sensor readings, and a defective MAP sensor itself can directly cause a P0106 DTC, which relates to manifold pressure/Barometric pressure circuit range/performance problem.

Question 4

Two technicians are discussing MAP sensors. Technician A says that the MAP sensor should be replaced if anything comes out of the sensor when the vacuum hose is removed from the sensor. Technician B says that the injector pulse width should increase when vacuum to the MAP sensor is increased. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Accepted Answer

Technician A is correct because if anything (like liquid or debris) comes out of the MAP sensor when the vacuum hose is removed, it indicates the sensor is contaminated or damaged, and replacement is necessary. Technician B is incorrect because the injector pulse width should decrease, not increase, when vacuum to the MAP sensor is increased, as increased vacuum indicates a lower engine load, requiring less fuel.

Question 5

Technician A says that a MAP sensor can be tested by visual inspection, using a digital meter, or a scan tool. Technician B says a light engine load results in low intake manifold vacuum and a high MAP sensor signal voltage. Who is right?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Accepted Answer

Technician A is correct because a MAP (Manifold Absolute Pressure) sensor can indeed be tested through visual inspection for any physical damage, using a digital multimeter to check for correct voltage or resistance, and with a scan tool to monitor the sensor's output in real-time. Technician B is incorrect because a light engine load actually results in high intake manifold vacuum and a low MAP sensor signal voltage, not the other way around.

Question 6

Which statement is FALSE?&#10;A)Barometric pressure minus the MAP sensor reading equals intake manifold vacuum&#10;B)The MAP sensor compares manifold vacuum to a perfect vacuum&#10;C)Absolute pressure is equal to barometric pressure plus intake manifold vacuum&#10;D)A decrease in manifold vacuum means an increase in manifold pressure

Accepted Answer

Absolute pressure is actually equal to barometric pressure minus intake manifold vacuum, not plus. The MAP (Manifold Absolute Pressure) sensor measures the absolute pressure in the intake manifold which is the actual atmospheric pressure outside minus the vacuum pressure inside the manifold.

Deck 74: Mapbaro Sensors