2008 Lexus ES 350FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. PERFORM ACTIVE TEST BY TECHSTREAM (VSV FOR AICV) 
    1. Turn the engine switch on (IG) and turn Techstream ON.
    2. Select the following menu items: Powertrain / Engine / Active Test / Activate the VSV for ACIS.
    3. Check the operation of the VSV when the VSV is operated by Techstream.

      Standard 

      TESTER OPERATION SPECIFIED CONDITION CHART

      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
      Fig 1: Checking Operation Of VSV
      G04973832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK:  Go to step  4

    NG: Go to next step. 

  2. CHECK VSV (FOR AICV) 
    1. Inspect the intake air control valve assembly (See VACUUM SWITCHING VALVE ).

    NG: REPLACE INTAKE AIR CONTROL VALVE ASSEMBLY 

    OK: Go to next step. 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM, VSV FOR AICV - EFI RELAY) 
    1. Check the wire harness between the VSV for AICV connector and the ECM connector.
      1. Disconnect the A47 VSV for AICV connector.
      2. Disconnect the A10 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        VSV for AICV (A47-2) - AICV (A10-4) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        VSV for AICV (A47-2) or AICV (A10-4) - Body ground 10 kΩ or higher
      4. Reconnect the ECM connector.
    2. Check the EFI No. 3 fuse.
      1. Remove the EFI No. 3 fuse from the engine room R/B.
      2. Measure the resistance of the EFI No. 3 fuse.

        Standard Resistance: 

        Below 1 Ω 

      3. Reinstall the EFI No. 3 fuse.
    3. Check the wire harness between the VSV for AICV and the EFI relay.
      1. Remove the engine room junction block from the engine room R/B.
      2. Measure the resistance between the terminals of the wire harness side connectors.

        Standard Resistance (Check for open) 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        VSV for AICV (A47-1) - 1E-6 Below 1 Ω
        Fig 2: Identifying Terminals Of B47 VSV For AICV And B10 ECM Connectors
        G05835597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Reconnect the VSV for AICV connector.
      4. Reinstall the engine room junction block.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  4. INSPECT VACUUM TANK 
    1. Inspect the vacuum tank (See ON-VEHICLE INSPECTION ).

    NG: REPAIR OR REPLACE AIR CLEANER CAP 

    OK: REPLACE ECM (See  REMOVAL   ) 

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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