The MAP (Manifold Absolute Pressure) sensor acts on changes in the pressure in the intake manifold. The Powertrain Control Module (PCM) provides 5 volts of power to the Manifold Absolute Pressure (MAP) Sensor.
This sensor has a resistance, which makes movements taking into account the pressure of the manifold. The voltage of this resistance may vary according to the motor load, it can be between 0.1 and 4.5 volts. This signal returns to the PCM (Powertrain Control Module) referring to the vacuum in the manifold. In this way, the PCM can define the fuel supply. Besides, If the Powertrain Control Module (PCM) detects that the MAP sensor voltage is below 0.25 volts, the fault code P0107 OBD2 is set.