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SFI SYSTEM ACIS Control Circuit

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DTC Code DTC Name
  ACIS Control Circuit
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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).

Table 1. Text in Illustration
*1 Intake Air Control Valve Open *2 Intake Air Control Valve Closed
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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PROCEDURE


  1. Click here

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE VSV FOR ACIS)


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

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

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

    5. Operate the VSV for ACIS.

    6. Check the VSV air flow when switching the VSV on and off.

      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

  2. Click here

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


    1. Check the vacuum hoses (Click here).


  3. Click here

    INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE)


    1. Inspect the intake air control valve (Click here).


  4. Click here

    INSPECT VSV FOR ACIS


    1. Inspect the VSV for ACIS (Click here).


  5. Click here

    CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM AND INTEGRATION RELAY)


    1. Disconnect the VSV for ACIS connector.

    2. Disconnect the ECM connector.

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

    4. Disconnect the integration relay connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C38-1 - C68-38 (ACIS) Always Below 1 Ω
      C38-2 - 1B-4 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C38-1 or C68-38 (ACIS) - Body ground Always 10 kΩ or higher
      C38-2 or 1B-4 - Body ground Always 10 kΩ or higher
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to VSV for ACIS)
      *2

      Front view of wire harness connector

      (to ECM)
      *3

      Front view of wire harness connector

      (to Integration Relay)

    6. Reconnect the VSV for ACIS connector.

    7. Reconnect the ECM connector.

    8. Reconnect the integration relay connector.

    9. Install the integration relay.


  6. Click here

    CHECK ECM POWER SOURCE CIRCUIT


    1. Check the ECM power source circuit (Click here).


  7. Click here

    REPAIR OR REPLACE VACUUM HOSES

  8. Click here

    REPLACE INTAKE MANIFOLDClick here

  9. Click here

    REPLACE VSV FOR ACISClick here

  10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACIS - ECM AND INTEGRATION RELAY)

  11. Click here

    REPAIR ECM POWER SOURCE CIRCUIT

  12. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  13. Click here

    REPLACE ECMClick here