SFI SYSTEM ACIS Control 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).

A01EN5ZE01

WIRING DIAGRAM

Refer to DTC P0660 Click here.

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (OPERATE VACUUM SWITCHING VALVE FOR ACIS)

    A01ENIAE01
    Text in Illustration
    *a VSV is ON
    *b VSV is OFF
    *c Air

    1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).

    2. Connect the GTS to the DLC3.

    3. Start the engine.

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

    5. Operate the vacuum switching valve for ACIS.

    6. Check the vacuum switching valve air flow when switching the vacuum switching valve.

      OK
      Test Condition Specified Condition
      Vacuum switching valve is ON Air from port E flows out through port F
      Vacuum switching valve is OFF Air from port E flows out through air filter

    NG

    INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR ACIS) Click here

    OK

  2. CHECK VACUUM HOSES (VACUUM SWITCHING VALVE (FOR ACIS) - 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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  4. INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR ACIS)


    1. Inspect the vacuum switching valve assembly (for ACIS) Click here.


    NG

    REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR ACIS) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE (FOR ACIS) - ECM AND NO. 1 INTEGRATION RELAY)


    1. Disconnect the vacuum switching valve (for ACIS) connector.

    2. Disconnect the ECM connector.

    3. Remove the No. 1 integration relay from the engine room relay block.

    4. Disconnect the No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C38-2 - C54-62 (ACIS) Always Below 1 Ω
      C38-1 - 1B-4 Always Below 1 Ω
      C38-2 or C54-62 (ACIS) - Body ground Always 10 kΩ or higher
      C38-1 or 1B-4 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here