For 1990-2009 cars

Table 1: | Function of Components
Table 2: | Operations of Clutches and Brakes
Table 3: | Transmission Range Reference

Notice: Lack of basic knowledge of this powertrain when performing diagnostic procedures could result in incorrect diagnostic performance or damage to powertrain components. Do not attempt to diagnose a powertrain problem without this basic knowledge.

The new automatic transmission AISIN (81-40LE) is an electronically controlled 4-speed automatic transmission with lock-up mechanism.

The transmission is mainly composed of the torque converter with lock up clutch, newly developed 4-speed planetary gear unit, the hydraulic control system and the electric control system.

### Hydraulic Control System

Based on the hydraulic pressure created by the oil pump, the TCM sends signals to the solenoid and the hydraulic control system governs the hydraulic pressure acting on the torque converter, planetary gear, clutches, and brakes in accordance with the vehicle driving conditions.

### Function of Components

Component | Function
--- | ---
7 | Forward Clutch | Connects the input shaft and front sun gear.
3 | Direct Clutch | Connects the input shaft and planetary carrier.
5 | Reverse Clutch | Connects the input shaft and rear sun gear.
6 | O/D and 2nd Brake | Prevents rear planetary sun gear from turning either clockwise or counterclockwise.
4 | 2nd Brake | Prevents outer race of 8 from turning either clockwise or counterclockwise, thus preventing the rear sun gear turning counterclockwise.
2 | 1st and Reverse Brake | Prevents the planetary carrier from turning either clockwise or counterclockwise.
8 | No. 1 One-Way Clutch | When 4 is operating, this clutch prevents rear sun gear from turning counterclockwise.
1 | No. 2 One-Way Clutch | Prevents the planetary carrier from turning counterclockwise.
Planetary Gear | These gears change the route through which driving force is transmitted, in accordance with the operation of each clutch and brake, in order to increase or reduce the input and output speed.

### Operations of Clutches and Brakes

Clutch and Brake | Operation
--- | ---
C1 | Forward Clutch | Connects the intermediate shaft and the front sun gear.
C2 | Direct Clutch | Connects the input shaft and the planetary carrier.
C3 | Reverse Clutch | Connects the intermediate shaft and the rear sun gear.
B1 | O/D and 2nd Brake | Lock rear sun gear
B2 | 2nd Brake | Lock rear sun gear
B3 | 1st and Reverse Brake | Lock planetary carrier
F1 | 1-Way Clutch No. 1 | Lock counterclockwise rotation of the rear sun gear, when B2 operations
F2 | 1-Way Clutch No. 2 | Lock counterclockwise rotation of the planetary carrier

#### Transmission Range Reference

Position | Solenoid | Clutch | Brake | One-Way Clutch
--- | --- | --- | --- | ---
Shift 1 | Shift 2 | Timing | C1 | C2 | C3 | B1 | B2 | B3 | F1 | F2
P | ON | ON | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF
R | V less than 9 km/h (5 mph) | ON | ON | OFF | OFF | OFF | ON | OFF | OFF | ON | OFF | OFF
V greater than or equal to 9 km/h (5 mph) | ON | ON | ON | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF
N | ON | ON | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF | OFF
D | 1st | ON | ON | OFF | ON | OFF | OFF | OFF | OFF | OFF | OFF | ON
2nd | ON | OFF | OFF | ON | OFF | OFF | OFF | ON | OFF | ON | OFF
3rd | OFF | OFF | OFF | ON | ON | OFF | OFF | ON | OFF | OFF | OFF
3-4 | OFF | ON | ON-OFF | ON-OFF | ON | OFF | OFF-ON | ON | OFF | OFF | OFF
4th | OFF | ON | OFF | OFF | ON | OFF | ON | ON | OFF | OFF | OFF
2 | 1st | ON | ON | OFF | ON | OFF | OFF | OFF | OFF | OFF | OFF | ON
2nd | ON | OFF | OFF | ON | OFF | OFF | ON | ON | OFF | ON | OFF
3rd | OFF | OFF | OFF | ON | ON | OFF | OFF | ON | OFF | OFF | OFF
1 | 1st | ON | ON | OFF | ON | OFF | OFF | OFF | OFF | ON | OFF | ON
2nd | ON | OFF | OFF | ON | OFF | OFF | ON | ON | OFF | ON | OFF