Variable Intake manifold Solenoid (VIS) valves are installed
on the intake manifold (VIS Valve 1) and the surge tank (VIS Valve 2).
These VIS valve 1 and 2 control vacuum modulators which activate valves
in the intake manifold and the surge tank. These valves opens or closes
by ECM according to engine condition (Refer to the table below).

Other information:
Service Adjustment Procedure
Steering Wheel Play Inspection
1.
Turn the steering wheel so that the front wheels are placed in the straight ahead position
2.
Measure the distance that the steering wheel is turned until the front wheels move.
Standard value : 0 ~ 30mm (1.18in.) or less
...
Description
Real-time continuous control of the damping force according
to vehicle running conditions and the state of road surface will enhance
ride comfort and steering safety, including roll/pitch reduction in
case of vehicle dynamics control, quick turning, braking, and starting.
Cont ...