WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
The CKP sensor detects crankshaft speed and is used by the PCM to determine ignition timing, timing for the fuel injection of each cylinder, and engine misfire detection.
Fig 1: Identifying Crankshaft Position (CKP) Sensor Magnet Terminal And O-Ring