SFI SYSTEM ACIS Control Circuit

DESCRIPTION

This circuit opens and closes the Intake Air Control Valve (IACV) according to the engine load in order to increase intake efficiency (ACIS: Acoustic Control Induction System).

A011SRAE02

WIRING DIAGRAM

A011QX2E03

INSPECTION PROCEDURE

Note

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

PROCEDURE

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

    A011RNPE02

    1. Disconnect the vacuum hose from port F of the vacuum switching valve assembly (for acoustic control induction system).

    2. Connect the Techstream 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 vacuum switching valve assembly for acoustic control induction system.

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

      OK
      Test Condition Specified Condition
      Vacuum switching valve assembly is ON Air from port E flows out through port F
      Vacuum switching valve assembly is OFF Air from port E flows out through air filter
      Text in Illustration
      *1 Air
      *2 Port F
      *3 Port E
      *4 Air Filter
      *a Vacuum Switching Valve Assembly is ON
      *b Vacuum Switching Valve Assembly is OFF
    NG

    INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR ACIS) Click here

    OK

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

    1. Check the vacuum hoses Click here.

    NG

    REPAIR OR REPLACE VACUUM HOSES

    OK

  3. INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE FOR ACIS)

    1. Inspect the intake air control valve (for acoustic control induction system) 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 acoustic control induction system) Click here.

    NG

    REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR ACIS) Click here

    OK

  5. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE ASSEMBLY)

    1. Disconnect the vacuum switching valve assembly connector.

      A011TFYE96

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E45-2 - Body ground Ignition switch ON 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Vacuum Switching Valve Assembly (for ACIS))
    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - VACUUM SWITCHING VALVE ASSEMBLY) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY - ECM)

    1. Disconnect the vacuum switching valve assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E45-1 - E26-69 (ACIS) Always Below 1 Ω
      E45-1 or E26-69 (ACIS) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  7. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - VACUUM SWITCHING VALVE ASSEMBLY)

    1. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

    2. Disconnect the vacuum switching valve assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-8 - E45-2 Always Below 1 Ω
      1A-8 or E45-2 - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here