Variable Induction Control Solenoid: Description and Operation

Variable Induction (T-VIS) Vacuum Switching Valve:

Each runner in the intake manifold is divided into two parts. An intake air control valve is installed in one passage in each cylinder runner. These air control valves are controlled by a vacuum switching valve (VSV), which is controlled by the ECU. This system provides better low-speed engine performance as well as improved fuel economy. The VSV inputs the ECU through terminal S/TH.