SFI SYSTEM > ACIS Control Circuit

for Preparation Click here


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).

A165943E03


WIRING DIAGRAM


A164741E03


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS)
A067588E03
  1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).

  1. Connect the Techstream to the DLC3.

  1. Start the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control.

  1. Operate the VSV for ACIS.

  1. Check the VSV air flow when switching the VSV.

    OK:
    Test Condition
    Specified Condition
    VSV is ON
    Air from port E flows out through port F
    VSV is OFF
    Air from port E flows out through air filter


NG
Go to step 4
OK


2.CHECK VACUUM HOSES (VACUUM SWITCHING VALVE - INTAKE AIR CONTROL VALVE, INTAKE MANIFOLD)


NG
REPAIR OR REPLACE VACUUM HOSES
OK


3.INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)
  1. Inspect the intake air control valve (Click here).



NG
REPLACE INTAKE MANIFOLD (Click here)
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

4.INSPECT VACUUM SWITCHING VALVE (FOR ACIS)
  1. Inspect the vacuum switching valve (for ACIS) (Click here).



NG
REPLACE VACUUM SWITCHING VALVE (FOR ACIS) (Click here)
OK


5.CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM AND INTEGRATION RELAY)
A165944E02
  1. Remove the EFI No. 2 fuse from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    EFI NO. 2 fuse
    Always
    Below 1 Ω
  1. Reinstall the EFI No. 2 fuse.

  1. Disconnect the intake air control valve connector.

  1. Disconnect the ECM connector.

  1. Remove the integration relay from the engine room relay block.

  1. Disconnect the integration relay connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    D62-2 - D74-62 (ACIS)
    Always
    Below 1 Ω
    D62-1 - 1B-4
    Always
    Below 1 Ω
    D62-2 or D74-62 (ACIS) - Body ground
    Always
    10 kΩ or higher
    D62-1 or 1B-4 - Body ground
    Always
    10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)