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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System And Circuit Testing, Active Control Engine Mount System (Including DTC P16A0 - P16A4), On-Vehicle Inspection, Removal, Inspection & Installation >> ACIS Control Circuit >> Inspection Procedure
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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 VSC48. Operate the VSV for AICS.

      OK: 

      Operational noise can be heard. 

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

    NG: Go to Next Step 

  2. CHECK INTAKE AIR CONTROL VALVE (OPERATION) 
    1. Disconnect the B41 air intake valve connector.
      Fig 1: Identifying B41 Air Intake Valve Connector Terminal
      G05247879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Apply battery voltage between the terminals of the air intake control valve connector.
    3. Check the air intake valve operation.

      OK: 

      Operational noise can be heard. 

    NG: REPLACE INTAKE AIR SURGE TANK 

    OK: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS RELAY) 
    1. Check the wire harness and connectors between the VSV for ACIS and ECM.
      1. Disconnect the B41 VSV for ACIS connector.
      2. Disconnect the B12 ECM connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open) 

        RESISTANCE REFERENCE (CHECK FOR OPEN)

        Tester Connection Specified Condition
        VSV for ACIS (B41-1) - ACIS (B12-107) Below 1 Ω

        Standard resistance (Check for short) 

        RESISTANCE REFERENCE (CHECK FOR SHORT)

        Tester Connection Specified Condition
        VSV for ACIS (B41-1) or ACIS (B12-107) - Body ground 10 kΩ or higher
      4. Reconnect the VSV for ACIS connector.
      5. 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 EFI No. 3 fuse resistance.

        Standard resistance: 

        Below 1 Ω 

      3. Reinstall the EFI No. 3 fuse.
    3. Check the wire harness between the VSV for ACIS connector and EFI MAIN relay.
      1. Remove the engine room junction block from the engine room R/B.
      2. Disconnect the B41 VSV connector.
        Fig 2: Identifying B41 Air Intake Connector Terminal
        G05247880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Measure the resistance between the terminals.

        Standard resistance (Check for open) 

        RESISTANCE REFERENCE (CHECK FOR OPEN)

        Tester Connection Specified Condition
        VSV for ACIS (B41 -2) - 1E-6 Below 1 Ω
      4. Reinstall the engine room junction block.
      5. Reconnect the VSV connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM (See  REMOVAL   ) 

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