Functional Diagram
The PCM receives input signals from the sensors, the switches, and other control units then processes the data, and sends output signals to the engine control system and the A/T control system. The A/T control system includes shift control, clutch pressure control, and lock-up control. The PCM switches the shift solenoid valves and the A/T clutch pressure control solenoid valves on and off to control gear selection and torque converter clutch lock-up.