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 600 or more, the ECM turns the VSV ON and closes the IACV. At all other times, the VSV is OFF, so the IACV is open.

Wiring Diagram:

INSPECTION PROCEDURE

Steps 1 - 3:

TOYOTA hand-held tester:

Steps 1 - 2:

OBD II scan tool (excluding TOYOTA hand-held tester):