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Home >> Toyota >> 2008 >> Sequoia Platinum, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (3UR-FE) - Circuit Testing, Component On-Vehicle Inspection, Removal, Inspection & Installation >> ACIS Control Circuit >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE VSV FOR ACIS) 
    1. Disconnect the vacuum hose from port F on the vacuum switching valve (for ACIS).
    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 VSV for ACIS.
    6. Check the VSV air flow when switching the VSV.

      OK 

      SPECIFIED CONDITION

      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
      Fig 1: Performing Active Test Using Techstream (Operate VSV For ACIS)
      G05644713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  4

    OK: Go to Next Step. 

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

    NG: REPAIR OR REPLACE VACUUM HOSES 

    OK: Go to Next Step. 

  3. INSPECT INTAKE MANIFOLD (INTAKE AIR CONTROL VALVE) 
    1. Inspect the intake air control valve (See ON-VEHICLE INSPECTION ).

    NG: REPLACE INTAKE MANIFOLD  (See REMOVAL )

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE )

  4. INSPECT VACUUM SWITCHING VALVE 
    1. Inspect the vacuum switching valve (See ON-VEHICLE INSPECTION ).

    NG: REPLACE VACUUM SWITCHING VALVE  (See REMOVAL )

    OK: Go to Next Step. 

  5. CHECK HARNESS AND CONNECTOR (VACUUM SWITCHING VALVE - ECM AND INTEGRATION RELAY) 
    1. Remove the EFI No. 2 fuse from the engine room relay block.
    2. Check the EFI No. 2 fuse.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      EFI NO. 2 fuse Always Below 1 Ω
    4. Reinstall the EFI No. 2 fuse.
    5. Disconnect the intake air control valve connector.
    6. Disconnect the ECM connector.
    7. Remove the integration relay from the engine room relay block.
    8. Disconnect the 1B integration relay connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      D40-2 - D56-62 (ACIS) Always Below 1 Ω
      D40-1 - 1B-4 Always Below 1 Ω
      D40-2 or D56-62 (ACIS) - Body ground Always 10 kΩ or higher
      D40-1 or 1B-4-Body ground Always 10 kΩ or higher
      Fig 2: Identifying ECM And Intake Air Control Valve Connector Terminals
      G05644714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM  (See REMOVAL  )

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