Control Description

The hydraulic control mechanism is comprised of the vane-type oil pump driven by the engine via the oil pump drive chain, the hydraulic control valve which controls the line pressure and shift change, and the input signal system.

Fig 1: Hydraulic Control System Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

GENERAL INFORMATION REGARDING MAIN COMPONENTS

Component	Function
Manual valve	Distributes the clutch operating pressure to each circuit, depending on each selector lever position.
Lock-up control valve	Regulates the engagement pressure and disengagement pressure of the torque converter.
Torque converter regulator valve	Regulates the supply pressure to the torque converter to the optimal pressure for the driving conditions.
Pressure regulator valve	Regulates the discharge pressure from the oil pump to the optimal pressure (line pressure) for the driving conditions.
Secondary reducing valve	Reduces the line pressure to regulate the secondary pressure.
Primary reducing valve	Reduces the line pressure to regulate the primary pressure.
Pilot valve A	Reduces the line pressure to regulate the operation pressures of the solenoid valves below. Primary pressure solenoid valve Secondary pressure solenoid valve Line pressure solenoid valve Select solenoid valve
Pilot valve B	Reduces fluid pressure delivered from pilot valve A to regulate the operation pressure of the lock-up solenoid valve.
Line pressure solenoid valve	Controls the pressure regulator valve.
Primary pressure solenoid valve	Controls the primary reducing valve.
Secondary pressure solenoid valve	Controls the secondary reducing valve.
Lock-up solenoid valve	Controls the lock-up control valve.
Select solenoid valve	Regulates the forward clutch pressure and reverse brake pressure.