Description of On-Board Diagnostics

GENERAL DESCRIPTION
The A341E automatic transmission is a 4-speed Electronically Controlled Transmission with an intelligent control developed exclusively for the Lexus LS400. The A341E automatic transmission has the following features.
- When shifting the transmission, the engine torque and the clutch hydraulic pressure in the transmission are electronically controlled to reduce transmission shift shock.
- A new type of ATF (ATF Type T-II) is used which provides improve shifting characteristics and prevents deterioration in the ATF over time.

HINT: For the A341E automatic transmission, use ATF Type T-II or equivalent.

- A super flow torque converter clutch is used to improve the transmission efficiency. The A341E automatic transmission is mainly composed of the torque converter clutch 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 adopted.