Variable Induction Control Actuator: Description and Operation
VARIABLE INTAKE SOLENOID (VIS) VALVEFUNCTION AND OPERATION PRINCIPLE
Variable Intake manifold Solenoid (VIS) valves are installed on surge tank (VIS Valve #1. and intake manifold (VIS Valve 412). These VIS valve #I 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.