IACV Control VSV Circuit

INTAKE AIR CONTROL VALVE (IACV) CONTROL CIRCUIT

CIRCUIT DESCRIPTION






This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System). When the engine speed is 3,700 rpm or less and the throttle valve opening angle is 60° or more, the ECM turns the vacuum switching valve (VSV) ON and closes the IACV. At all other times, the VSV is OFF, so the IACV is open.

WIRING DIAGRAM

Intake Air Control Valve (IACV) Control Circuit:

INSPECTION PROCEDURE

TOYOTA hand-held tester













OBD II scan tool (excluding Toyota hand-held tester)