Automatic Transmission/Transaxle: Description and Operation

The A340E and A341E automatic transmissions are 4-speed Electronically Controlled Transmissions with an intelligent control (hereafter called ECT-i). When shifting the transmission, the engine torque is controlled and the clutch hydraulic pressure in the transmission is electronically controlled to reduce transmission shift shock. A new type of ATF Type T-IV (TSB - T003-99 5/21/99) is used which provides improved shifting characteristics and prevents deterioration in the ATF over time. A super flow torque converter is used to improve the transmission efficiency. Both transmissions are mainly composed of the torque converter with lock-up clutch, 4-speed planetary gear unit, the hydraulic control system and the electronic control system. To minimize the possibility of incorrect operation of the automatic transmission, a shift lock mechanism has also been added.