Electronic Control
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.
Shifting and lock-up are achieved by a system of solenoid valves driven by the PCM, which controls ATF flow through various valves in the valve bodies to select the appropriate gears for all driving conditions.