F4A21

The F4A21 transaxle is a fully automatic four speed transaxle with lock-up torque converter. This transaxle is optional on all Colt and Eagle Summit models with 1.5L/4-96 engines.

The Electronic Control Unit 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 Electronic Control Unit 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