|
|
A/T CONTROL SYSTEM AT-37 D E F G H I J K L M A B AT Control Valve ACS004Q4 FUNCTION OF CONTROL VALVE FUNCTION OF PRESSURE SWITCH Name Function Torque converter regulator valve In order to prevent the pressure supplied to the torque converter from being excessive, Pressure regulator valve Adjusts the oil discharged from the oil pump to the optimum pressure (line pressure) for Front brake control valve When the front brake is coupled, adjusts the line pressure to the optimum pressure Accumulator control valve Adjusts the pressure (accumulator control pressure) acting on the accumulator piston Pilot valve A Adjusts the line pressure and produces the constant pressure (pilot pressure) required Pilot valve B Adjusts the line pressure and produces the constant pressure (pilot pressure) required Low coast brake switching valve During engine braking, supplies the line pressure to the low coast brake reducing valve. Low coast brake reducing valve When the low coast brake is coupled, adjusts the line pressure to the optimum pressure N-R accumulator Produces the stabilizing pressure for when N-R is selected. Direct clutch piston switching valve Operates in 4th gear and switches the direct clutch coupling capacity. High and low reverse clutch control valve When the high and low reverse clutch is coupled, adjusts the line pressure to the opti- Input clutch control valve When the input clutch is coupled, adjusts the line pressure to the optimum pressure Direct clutch control valve When the direct clutch is coupled, adjusts the line pressure to the optimum pressure TCC control valve Switches the lock-up to operating or released. Also, by executing the lock-up operation Torque converter lubrication valve Operates during lock-up to switch the torque converter, cooling, and lubrication system Cool bypass valve Allows excess oil to bypass cooler circuit without being fed into it. Line pressure relief valve Discharges excess oil from line pressure circuit. N-D accumulator Produces the stabilizing pressure for when N-D is selected. Manual valve Sends line pressure to each circuit according to the select position. The circuits to which Name Function ATF pressure switch 1 (FR/B) Detects any malfunction in the front brake hydraulic pressure. When it detects any mal- ATF pressure switch 2 (LC/B) Detects any malfunction in the low coast brake hydraulic pressure. When it detects any ATF pressure switch 3 (I/C) Detects any malfunction in the input clutch hydraulic pressure. When it detects any mal- |