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A/T CONTROL SYSTEM TM-85 < FUNCTION DIAGNOSIS > [5AT: RE5R05A] C E F G H I J K L M A B TM N O P - After switching to manual mode with paddle shifter, switching to DS mode can not be enabled even when the selector lever is shifted to the manual gate. (With paddle shifter) LOCK-UP CONTROL The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to Lock-up operation condition table Torque Converter Clutch Control Valve Control Lock-up control system diagram Lock-up Released • In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the torque converter clutch solenoid and the lock-up apply pressure is drained. Lock-up Applied • In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque converter clutch solenoid and lock-up apply pressure is generated. Smooth Lock-up Control When shifting from the lock-up released state to the lock-up applied state, the current output to the torque con- Half-clutched State • The current output from the TCM to the torque converter clutch solenoid is varied to steadily increase the torque converter clutch solenoid pressure. Slip Lock-up Control • In the slip region, the torque converter clutch solenoid current is controlled with the TCM to put it into the half-clutched state. This absorbs the engine torque fluctuation and lock-up operates from low speed. ENGINE BRAKE CONTROL • The forward one-way clutch transmits the drive force from the engine to the rear wheels. But the reverse drive from the rear wheels is not transmitted to the engine because the one-way clutch is idling. Selector lever “D” position “M” position Gear position 5 4 3 5 4 3 2 Lock-up × × × × × × × Slip lock-up × × × – – – – PCIA0014E |