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 2,500 rpm or less, or 4,900 rpm or more and the throttle valve opening angle is 60 or more, the VSV is OFF, so the IACV is open. All the other times, the ECM turns the VSV ON and closes the IACV.

WIRING DIAGRAM

INSPECTION PROCEDURE

Step 1:

Step 2:

Step 3:

LEXUS hand-held tester

Step 1:

Step 2:

Step 3:

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