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 CMP sensor detects the position of the No. 1 cylinder as a reference for sequential fuel injection to each cylinder.
Fig 1: Identifying Camshaft Position (CMP) Sensor Magnet Terminal