IACV Control Circuit

CIRCUIT DESCRIPTION




This circuit opens and closes the IACV (Intake Air Control Valve) 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 300 or more, the ECM turns the two VSV ON or OFF and operate the IACV.

Wiring Diagram:

INSPECTION PROCEDURE

Steps 1 - 3:

TOYOTA hand-held tester:

Steps 1 - 3:

OBD II Scan Tool (excluding TOYOTA hand-held tester):