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Description & Operation: Description
- The VIS valve controls the vacuum modulator which activates a valve in the intake manifold.
- The ECM opens or closes this valve according to engine condition (Refer to below table).
 Courtesy of KIA MOTORS AMERICA, INC.
|
| Engine condition |
VIS valve |
Operation |
| Medium speed |
Closed |
Increasing engine performance in low engine speed by reducing intake interference among cylinders |
| Low/High speed |
Open |
Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance |
 Courtesy of KIA MOTORS AMERICA, INC.
|