Hyundai Santa Fe (DM): Variable Intake Solenoid (VIS) Valve. 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 table).
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 |
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