Home Chapter 13 Chapter Quiz

# Chapter Quiz

This activity contains 10 questions.

## As the load on an engine increases, the manifold vacuum decreases and the manifold absolute pressure _____.

 Increases Decreases Changes with barometric pressure only (altitude or weather) Remains constant (absolute)

## A typical MAP compares the vacuum in the intake manifold to _____.

 Atmospheric pressure A perfect vacuum Barometric pressure The value of the IAT sensor

## Which statement is false?

 Absolute pressure is equal to barometric pressure plus intake manifold vacuum. A decrease in manifold vacuum means an increase in manifold pressure. The MAP sensor compares manifold vacuum to a perfect vacuum. Barometric pressure minus the MAP sensor reading equals intake manifold vacuum.

## Which design of MAP sensor produces a frequency (digital) output signal?

 Silicon-diaphragm strain gauge Piezoresistivity design Capacitor-capsule Ceramic disc

## The frequency output of a digital MAP sensor is reading 114 Hz. What is the approximate engine vacuum?

 Zero 5 in. Hg 10 in. Hg 15 in. Hg

## Which is not a purpose or function of the MAP sensor?

 Measures the load on the engine Measures engine speed Calculates fuel delivery based on altitude Helps diagnose the EGR system

## When measuring the output signal of a MAP sensor on a General Motors vehicle, the digital multimeter should be set to read _____.

 DCV ACV Hz DCA

Two technicians are discussing testing 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. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B

## Technician A says that MAP sensors use a 5-volt reference voltage from the PCM. Technician B says that the MAP sensor voltage will be higher at idle at high altitudes compared to when the engine is operating at near sea level. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B

## A P0107 DTC is being discussed. Technician A says that a defective MAP sensor could be the cause. Technician B says that a MAP sensor signal wire shorted-to-ground could be the cause. Which technician is correct?

 Technician A only Technician B only Both Technicians A and B Neither Technician A nor B