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 4,700 rpm or more and the throttle valve opening angle is 60 ° or more, the VSV is OFF, so the is IACV open. All the other times, the ECM turns the VSV ON and closes the IACV.

Wiring Diagram:

INSPECTION PROCEDURE

Step 1 - 2:

Step 3 - 4:

LEXUS hand-held tester:

Step 1 - 2:

Step 3:

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