Description And Operation: Description
Variable Intake Manifold Solenoid (VIS) Valve is installed on the Intake Manifold. 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 chart).
| 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 |