Vacuum Switching Valve For ACIS

CIRCUIT DESCRIPTION
The circuit opens and closes the IACV (Intake Air Control Valve) in response to the engine load in order to increase the intake efficiency (AC IS: Acoustic Control Induction System).
When the engine speed is 4,500 rpm or less and throttle position is 30° or more, or engine speed is 4,500 rpm or more and throttle position is 30° or less, the ECM turns the VSV on and closes the IACV. At all other times, the VSV is off, so the IACV is open.





DIAGNOSTIC CHART





WIRING DIAGRAM











INSPECTION PROCEDURE