2007 Lexus RX 350 FWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE VSV FOR ACIS) 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine and turn the intelligent tester on.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1. Operate the VSV for AICS.

      OK: 

      Operational noise can be heard. 

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

    NG: Go to Next Step 

  2. CHECK INTAKE AIR CONTROL VALVE (OPERATION) 
    1. Disconnect the V1 air intake valve connector.
    2. Apply battery voltage between the terminals of the air intake valve connector.
    3. Check the air intake valve operation.

      OK: 

      Operational noise can be heard. 

    NG: REPLACE INTAKE AIR SURGE TANK 

    Fig 1: Identifying Air Intake Valve Connector
    G05268256Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI MAIN RELAY) 
    1. Check the wire harness and connectors between the VSV for ACIS and ECM.
      1. Disconnect the V1 VSV for ACIS connector.
      2. Disconnect the E8 ECM connector.
      3. Measure the resistance between the terminals of the VSV for ACIS connector and ECM connector.

        Standard resistance: 

        Check for open 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Specified Condition
        VSV for ACIS (V1-1) - ACIS (E8-33) Below 1 Ω

        Check for short 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Specified Condition
        VSV for ACIS (V1-1) or ACIS (E8-33) - E1 (E7-1) 10 kΩ or higher
      4. Reconnect the VSV for ACIS connector.
      5. Reconnect the ECM connector.
    2. Check the EFI No. 2 fuse.
      1. Remove the EFI No. 2 fuse from the fusible link block.
      2. Measure the EFI No. 2 fuse resistance.

        Standard resistance: 

        Below 1 Ω 

      3. Reinstall the EFI No. 2 fuse.
    3. Check the wire harness between the VSV for ACIS connector and EFI MAIN relay.
      1. Remove the EFI MAIN relay from the engine room R/B.
      2. Disconnect the V1 VSV connector.
      3. Measure the resistance between the terminals.

        Standard resistance: 

        Check for open 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connection Specified Condition
        VSV for ACIS (V1-2) - EFI MAIN relay terminal (3) Below 1 Ω
      4. Reinstall the EFI MAIN relay.
      5. Reconnect the VSV connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Identifying VSV For ACIS, ECM And EFI Main Relay Connector Terminals
    G05268257Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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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