Variable Induction Control Solenoid: Description and Operation

CIRCUIT DESCRIPTION
The circuit opens and closes the Intake Air Control Valve IACV in response to the engine load in order to increase the intake efficiency Acoustic Control Induction System (ACIS).
When the engine speed is 4,500 rpm or less and throttle valve opening angle is 30° or more, or engine speed is 4,500 rpm or more and throttle valve opening angle is 30° or less, the engine control module turns the VSV ON and closes the IACV. At all other times, the VSV is OFF, so the IACV is open.