Shift Control Mechanism
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2014 Honda Ridgeline, 2013 Honda Ridgeline, 2012 Honda Ridgeline, 2011 Honda Ridgeline, and 2010 Honda Ridgeline. However, it is still accessible from the selected car via links, so may be relevant.
To shift gears, the PCM controls shift solenoid valves A, B, C and D, and automatic transmission (A/T) clutch pressure control solenoid valves A, B, and C. The shift solenoid valves change the positions of the shift valves in the valve body which open and close ports sending hydraulic pressure to the appropriate clutch. A/T clutch pressure control solenoid valves A, B, and C change the position of CPC valves A and B, and the reverse CPC valve, to control hydraulic pressure going to the clutches, which allows smooth shifts between gears.