Control Valve: Function

CONTROL VALVE FUNCTION CHART

Name	Function
Torque converter regulator valve	Regulates the line pressure to an optimum level (torque converter operating pressure) to prevent excessive torque converter supply pressure.
Pressure regulator valve Pressure regulator plug Pressure regulator sleeve	Regulates the pressure of oil discharged from the oil pump to an optimum level (line pressure) which is suitable for the vehicle's running condition.
Front brake control valve	Regulates the line pressure to an optimum level (front brake pressure) when the front brake is engaged, and supplies this pressure to the front brake, (regulates clutch pressure in 1st, 2nd, 3rd and 5th speeds)
Accumulator control valve	Regulates the pressure to the accumulator piston and low coast reducing valve (accumulator control pressure) in accordance with the vehicle's running condition.
Pilot valve A	Regulates the line pressure to create a constant pressure (pilot pressure) necessary for line pressure control, gear shift control, and lockup control.
Pilot valve B	Regulates the line pressure to create a constant pressure (pilot pressure) necessary for gear shift control.
Low coast brake switch valve	Supplies line pressure to the low coast brake reducing valve when engine braking is used.
Low coast brake reducing valve	Regulates the line pressure to an optimum level (low coast brake pressure) when the low coast brake is engaged, and supplies this pressure to the low coast brake.
N-R accumulator	Builds a shelf-pressure when N-R is selected.
Direct clutch piston switching valve	Operates in 4th speed and switches the engaging capacity of the direct clutch.
High and low reverse clutch control valve	Regulates the line pressure to an optimum level (high and low reverse clutch pressure) when the high and low reverse clutch is engaged, and supplies this pressure to the high and low reverse clutch, (regulates clutch pressure in 1st, 2nd, 4th and 5th speeds)
Input clutch control valve	Regulates the line pressure to an optimum level (input clutch pressure) when the input clutch is engaged, and supplies this pressure to the input clutch, (regulates clutch pressure in 4th and 5th speeds)
Direct clutch control valve	Regulates the line pressure to an optimum level (direct clutch pressure) when the direct clutch is engaged, and supplies this pressure to the direct clutch, (regulates clutch pressure in 2nd, 3rd and 4th speeds)
Lockup control valve Lockup control plug Lockup control sleeve	Engages or releases lockup. It also provides a smooth lockup by performing lockup gradually.
Torque converter lubrication valve	Operates when lockup is engaged and switches the oil passages of the torque converter, cooling and lubrication systems.
Cooler bypass valve	Detours excessive cooler circuit oil.
Line pressure relief valve	Drains excessive line pressure circuit oil.
N-D accumulator	Builds a shelf-pressure when N-D is selected.
Manual valve	Delivers line pressure to the circuits according to the selected position. Circuits, which are not delivered with line pressure becomes drain.
Front brake hydraulic switch	Monitors front brake oil pressure and lets the system enter the fail safe mode if abnormality is found.
Low coast brake hydraulic switch	Monitors low coast brake oil pressure and lets the system enter the fail safe mode if abnormality is found.
Input clutch hydraulic switch	Monitors input clutch oil pressure and lets the system enter the fail safe mode if abnormality is found.
Direct clutch hydraulic switch	Monitors direct clutch oil pressure and lets the system enter the fail safe mode if abnormality is found.
High and low reverse clutch hydraulic switch	Monitors high and low reverse clutch oil pressure and let the system enter the fail safe mode if abnormality is found.