SFI SYSTEM(w/ Canister Pump Module) Air Intake Control Circuit

DESCRIPTION

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range. When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm, the ECM activates VSV and opens the AICV.

B000XFZE09

WIRING DIAGRAM

B000Z5ZE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR AICV)

    B000XHMC03
    *1 Air
    *2 Port E
    *3 Port F
    *4 Air Filter
    *a Vacuum Switching Valve is On
    *b Vacuum Switching Valve is Off

    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Activate / Active Test the VSV for ACIS


      Powertrain > Engine > Active Test
      Tester Display
      Activate the VSV for AICS

    5. Check for operation of the VSV when the VSV is operated using the GTS.

      Standard
      GTS Connection Specified Condition
      ON Air from port E flows out through port F
      OFF Air from port E flows out through the air filter
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)


    1. Inspect the vacuum switching valve assembly (for AICV).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))

    B000VH2C99
    *a

    Front view of wire harness connector

    (to Vacuum Switching Valve Assembly (for AICV)

    1. Disconnect the vacuum switching valve assembly (for AICV) connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A62-2 - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY NO. 1 - VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV) - ECM)


    1. Disconnect the vacuum switching valve assembly (for AICV) 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
      A62-1 - A58-5 (AICV) Always Below 1 Ω
      A62-1 or A58-5 (AICV) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT AIR CLEANER ASSEMBLY (VACUUM SURGE TANK)


    1. Inspect the vacuum surge tank.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE AIR CLEANER ASSEMBLY

  6. CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY NO. 1 - VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))


    1. Remove the EFI-MAIN NO. 1 relay and A/F HTR relay from No. 1 engine room relay block and junction block assembly.

      Tech Tips

      Remove the A/F HTR relay connected between the checked terminals as the coil inside the relay influences the measurement value.

    2. Disconnect the vacuum switching valve assembly (for AICV) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3(EFI-MAIN NO. 1 relay holder) - A62-2 Always Below 1 Ω
      3(EFI-MAIN NO. 1 relay holder) or A62-2 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO ECM POWER SOURCE CIRCUIT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR