Transmission Control Systems: Description and Operation

The Mitsubishi W4A33 is a fully automatic four-speed electronically controlled transaxle. This transaxle is used on Eclipse models with 2.0L Turbo engine and All Wheel Drive. This model is not equipped with a lock up torque converter.

The Transaxle Control Module receives inputs from the following:

- Pulse Generator "A"
- Pulse Generator "B"
- Coolant Temperature Sensor
- Oil Temperature Sensor
- Throttle Position Sensor
- Idle Motor Position Switch
- Accelerator Switch
- Inhibitor Switch
- Kickdown Servo Switch

The Transaxle Control Module calculates if a shift change is needed and controls the following outputs:

- Damper Clutch Control Solenoid Valve
- Pressure Control Solenoid Valve
- Shift-Control Solenoid Valve