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Home › Toyota › 2007 › 4Runner Limited, 4.0 U, RWD › Repair and Diagnosis › Engine Performance › Engine Control System (1GR-FE) › SFI System › ACIS Control Circuit › Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE VSV FOR ACIS) 
    1. Disconnect the vacuum hose.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch to ON and turn the intelligent tester ON.
    4. Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the VSV for AICS.
    5. Check the VSV operation when it is operated using the intelligent tester.
      Fig 1: Checking VSV Operation When It Is Operated Using Intelligent Tester
      G04968622Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

      Standard 

      TESTER OPERATION SPECIFIED CONDITION

      Tester Operation Specified Condition
      VSV is ON Air from port E flows out through port F
      VSV is OFF Air from port E flows out through the air filter
    6. Reconnect the vacuum hose.

    OK: Go to step  4

    NG: GO TO NEXT STEP 

  2. CHECK VACUUM SWITCHING VALVE (OPERATION) 
    1. Check that air flows from port E to the air filter.
      Fig 2: Checking Air Flows From Port E To Air Filter
      G04968623Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Apply battery voltage across the terminals.
    3. Check that air flows from port E to port F.
      Fig 3: Checking Air Flows From Port E To Port F
      G04968624Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPLACE VACUUM SWITCHING VALVE 

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY) 
    1. Check the wire harness and connectors between the VSV for ACIS and ECM.
      1. Disconnect the V1 VSV for ACIS connector.
        Fig 4: Identifying ACIS Connector
        G04968625Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      2. Disconnect the E4 ECM connector.
      3. Measure the resistance between the terminals of the VSV for ACIS connector and ECM connector.

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        VSV for ACIS (V1 -1) - ACIS (E4-33) Below 1 Ω

        Standard resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        VSV for ACIS (V1-1) or ACIS (E4-33) - E1 (E6-1) 10 kΩ or higher
      4. Reconnect the VSV for ACIS connector.
      5. Reconnect the ECM connector.
    2. Check the wire harness between the VSV for ACIS and EFI relay.
      1. Disconnect the V1 VSV for ACIS connector.
      2. Remove the EFI fuse from the engine room R/B and J/B.
      3. Measure the resistance of the VSV for ACIS connector and engine room R/B (EFI fuse).

        Standard resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS

        Tester Connections Specified Conditions
        VSV for ACIS (V1-1) - EFI relay (3) Below 1 Ω
      4. Reconnect the VSV for ACIS connector.
      5. Reinstall the EFI fuse.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  4. CHECK VACUUM HOSES 
    1. Check that the vacuum hose is connected correctly.
    2. Check the vacuum hose for looseness and disconnection.
    3. Check the vacuum hose for cracks, holes and damage.

    NG: REPAIR OR REPLACE VACUUM HOSES 

    OK: GO TO NEXT STEP 

  5. INSPECT INTAKE AIR CONTROL VALVE (INTAKE AIR SURGE TANK) 

    NG: REPLACE INTAKE AIR SURGE TANK 

    OK: REPLACE ECM 

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