Manifold Absolute Pressure Sensor
WARNING: This page is about a different car, the 2017 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
The manifold absolute pressure (MAP) sensor is placed at intake manifold collector. It detects intake manifold pressure and sends the voltage signal to the ECM.
 Courtesy of NISSAN NORTH AMERICA, INC.
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The sensor uses a silicon diaphragm which is sensitive to the change in pressure. As the pressure increases, the voltage rises.