2007 Lexus RX 350 FWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSV FOR AICV) 
    1. Turn the ignition switch to the ON position and turn the intelligent tester on.
    2. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1 and operate the VSV for AICV.
    3. Check the operation of the VSV when the VSV is operated by the intelligent tester.

      Standard 

      ACTIVE TEST 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

    OK: Go to step  4

    Fig 1: Identifying VSV Operations
    G04973832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to Next Step 

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

    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 MAIN RELAY) 
    1. Check the wire harness between the VSV for AICV connector and the ECM connector.
      1. Disconnect the 11 VSV for AICV connector.
      2. Disconnect the E8 ECM connector.
      3. Measure the resistance between the terminals of the wire harness side connectors and body ground.

        Standard resistance: 

        Check for open 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Specified Condition
        VSV for AICV (I1-2) - AICV (E8-27) Below 1 Ω

        Check for short 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Specified Condition
        VSV for AICV (I1-2) or AICV (E8-27) - Body ground 10 kΩ or higher
      4. Reconnect the ECM connector.
    2. Check the wire harness between the VSV for AICV and the EFI MAIN relay.
      1. Remove the EFI MAIN relay 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

        Tester Connection Specified Condition
        VSV for AICV (I1-1) - EFI MAIN relay terminal (3) Below 1 Ω
      3. Reconnect the VSV for AICV connector.
      4. Reinstall the EFI MAIN relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying VSV For AICV, ECM And EFI Main Relay Connector Terminals
    G05268261Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  4. INSPECT VACUUM TANK 
    1. Inspect the vacuum tank (See 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.