Crankshaft Position (CKP) Sensor Pulse Wheel Installation Note
WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
With the "FRONT" mark of the pulse wheel facing you, install the crankshaft position (CKP) sensor pulse wheel using the keyway on the same side as the empty space shown in figure.
Fig 1: Installing Crankshaft Position (CKP) Sensor Pulse Wheel