Steering: Service and Repair

4WS Service Information
On models equipped with the electronically controlled power assisted 4WS (4-wheel steering) system, note the following special precautions before service.

^ After performing the following operations, check and adjust the 4WS system to be sure that it is electronically and mechanically in neutral (all 4 wheels in proper alignment).





The 4WS system must bell) mechanically and 121 electronically in neutral for proper operation. Perform the following mechanical neutral check on the system and adjust as necessary first, then perform the following electronic neutral check and adjust as necessary.

(1) Mechanically neutral:
Be sure that the front and rear wheels align properly with the steering wheel in the straight driving position (i.e. difference in computerized four wheel alignment equipment reading between the right and left wheels is within 0.5 mm/0.02 in).





(2) Electronic neutral:
Be sure that the following sensors are electronically in neutral with the steering wheel in the straight driving position. Electronic neutral position is indicated by blinking or lighting of the 4WS indicator light.
- Front Main Steering Angle Sensor
- Front Sub Steering Angle Sensor
- Rear Main Steering Angle Sensor
- Rear Sub Steering Angle Sensor

If the spoke angle of steering wheel is not at the designated angle while driving straight, check whether it was caused simply by an improperly installed steering wheel or by the misalignment of the front and rear wheels. Check the wheels for proper alignment before adjusting the steering wheel spoke angle.





Install the rear steering lock pin in the rear actuator and, with the steering wheel in the straight driving position, check the wheels for proper alignment (i.e. difference in computerized four wheel alignment equipment reading between the right and left wheels is within 0.5 mm/0.02 in).

Check the sensors for electronic neutral to be sure that the rear wheels are in correct steering angle while driving.
^ Do not contaminate the front and rear sub steering angle sensors, front and rear main steering angle sensors, and the rear steering actuator motor terminals with mud, oil, and grease.

^ The phrase "the steering wheel in the straight driving position" means that the front wheels are in the straight driving position with the steering wheel spokes at a horizontal angle.

^ If the power to the 4WS control unit was shut down for the following operations, start the engine and turn the steering wheel fully right and left before checking and adjusting the 4WS system.
- Battery removal/installation
- 4WS control unit removal/installation
- No.43 fuse CLOCK RADIO removal (in the under-hood fuse/relay box)

CAUTION:
^ The rear wheel steering angle is not controlled when the engine is OFF. When the engine is started, the rear wheels are steered to an angle in accordance with the front wheel angle. We recommend that the steering system be serviced with the steering wheel set in the straight driving position.

^ Do not start the engine with the lock pin set in the rear actuator. The rear actuator might be damaged when the rear wheels are steered. Be sure to remove the lock pin after service.