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Valve name Function 3-2 timing valve Prevents a late operation of the brake band when shifting selector lever from “D” to “1” or “2” 3 . “1” reducing valve Reduces low & reverse brake pressure to dampen engine-brake shock when downshifting 2 to 1 1 . Overrun clutch reducing valve Reduces oil pressure directed to the overrun clutch and prevents engine-brake shock. Torque converter relief valve Prevents an excessive rise in torque converter pressure. Torque converter clutch control valve Activate or inactivate the lock-up function. Shuttle shift valve D Switches hydraulic circuits so that output pressure of the torque converter clutch solenoid 2 , D 3 and D 4 . (“1” or “R” position, lock-up is inhibited.) Lock-up control is not affected in “D” position D 2 , D 3 or D 4 , unless output pressure of the torque converter clutch solenoid valve is generated by a signal from the TCM. GI MA EM LC EC FE PD FA RA BR ST RS BT HA EL IDX OVERALL SYSTEM Control Valve (Cont’d) AT-37 |