Intake Manifold Removal Note

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the MAP sensor/IAT sensor No. 2 connector. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR No. 2 REMOVAL/INSTALLATION .)
Disconnect the harness clip from the intake manifold as shown in the figure.

Fig 1: Disconnecting Harness Clip From Intake Manifold
Courtesy of MAZDA MOTORS CORP.
Remove the intake manifold.