Function And Operation Principle

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

ENGINE OPERATION CONDITION

Engine Condition	VIS Valve #1 (Surge Tank)	VIS Valve #2 (In-manifold)	Operation
Low Speed	Closed	Closed	Increasing engine performance in low engine speed by reducing intake interference among cylinders
Medium Speed	Open	Open or closed	Increasing intake efficiency
High Speed	Open	Open	Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance

Fig 1: Identifying Variable Intake Solenoid Valve

Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Variable Intake Solenoid Valve Open And Closed Position

Courtesy of KIA MOTORS AMERICA, INC.

SPECIFICATION

ITEM SPECIFICATION

Item	Specification
Coil Resistance (Ω)	29.0 ~ 35.0 Ω at 20°C (68°F)