Barometric Pressure Sensor
WARNING: This page is about a different car, the 2019 Nissan NV200. However, it is still accessible from the selected car via links, so may be relevant.
The barometric pressure sensor is placed at left side of engine room. It detects atmospheric 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.