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Home › Toyota › 2008 › Tundra Base, 5.7 V, RWD › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System (3UR-FE) - System Testing, 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.
      Fig 1: Checking VSV Air Flow Switching Valve
      G05681676Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK 

      VSV AIR FLOW 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

    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. (SeeVACUUM SWITCHING VALVE (FOR ACIS) ).

    NG : REPLACE INTAKE MANIFOLD  . (See INTAKE MANIFOLD ).

    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 VACUUM SWITCHING VALVE (FOR ACIS) ).

    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 SPECIFICATION

      Tester Connection Condition Specified Condition
      EFI NO. 2 fuse Always Below 1 Ω
    4. Reinstall the EFI NO. 2 fuse.
    5. Disconnect the D62 intake air control valve connector.
    6. Disconnect the D74 ECM connector.
    7. Remove the integration relay from the engine room relay block (see ON-VEHICLE INSPECTION  ).
    8. Disconnect the 1B integration relay connector.
    9. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      D62-2 - D74-62 (ACIS) Always Below 1 Ω
      D62-1 - 1B-4 Always Below 1 Ω
      D62-2 or D74-62 (ACIS) - Body ground Always 10 kΩ or higher
      D62-1 or 1B-4 - Body ground Always 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying D62 Intake Air Control Valve, D74 ECM & 1B Integration Relay Connector Terminals
    G05681677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE ECM  (See REMOVAL  )

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