Functional Diagram
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 PCM receives input signals from the sensors, switches and other control units, processes data, and outputs signals for the engine control system and the A/T control system. The A/T control system includes shift control, clutch pressure control, lock-up control, and A/T system hydraulic control. The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves on and off in a specific sequence to control gear selection and torque converter clutch lock-up. It also controls the appropriate operating hydraulic pressure to the automatic transmission.