4WAS Front Actuator

COMPONENT PARTS


4WAS SYSTEM : 4WAS Front Actuator

- 4WAS front actuator mainly consists of five components. [4WAS front lock solenoid valve (lock structure), front wheel steering angle sensor, 4WAS front motor, gear shaft, and spiral cable]
- 4WAS front motor, 4WAS front lock solenoid valve, front wheel steering angle sensor and gear shaft is integrated with 4WAS front actuator.
- 4WAS front lock solenoid valve (lock structure) is controlled by the 4WAS front control unit, and locks/ unlocks 4WAS front actuator.
- If a strong force (rotation direction) is applied to 4WAS front actuator, the locking mechanism (holder) absorbs the force and locks 4WAS front actuator.
- Gear shaft is an output axis of 4WAS front motor. (Gear shaft = 4WAS front motor revolution + steering angle)
- Spiral cables mean the power line and signal lines of 4WAS front motor.
- 4WAS front actuator rotates together with steering wheel.
- 4WAS front actuator is activated by 4WAS front motor.
- Front wheel steering angle sensor detects a turning angle of 4WAS front motor.
- Wiring connected to 4WAS front actuator is integrated with 4WAS front actuator.

4WAS FRONT MOTOR
4WAS front motor controls number of revolutions by a command value from the 4WAS front control unit.

4WAS FRONT LOCK SOLENOID VALVE
- 4WAS front actuator releases the lock when the engine speed signal is "ON". 4WAS front actuator applies the lock when the engine speed signal is "OFF".
- Secure the inside of 4WAS front actuator temporarily. (It operates when performing active test with fail-safe function and CONSULT-III.)
- CAUTION:
Never perform other than trouble diagnosis, etc.
- The front steering gear ratio (4WAS front actuator) changes with 4WAS front motor and the gear shaft when releasing the lock structure (4WAS front lock solenoid valve).

NOTE:
The lock structure is released when turning 4WAS lock solenoid valve ON.
- The lock structure (holder) absorbs force and applies the lock when applying strong force to 4WAS front actuator.

CAUTION:
Replace 4WAS front actuator when the system breaks down due to the excessive external force
(rotating direction) applied to 4WAS front actuator.

FRONT WHEEL STEERING ANGLE SENSOR
The front wheel steering angle increased/decreased degree is detected.