2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK VACUUM SWITCHING VALVE (VSV FOR AIR INTAKE CONTROL VALVE) 
    1. Inspect the VSV for air intake control valve (See ON-VEHICLE INSPECTION ).

    NG: REPLACE VSV (FOR AIR INTAKE CONTROL VALVE) 

    OK: Go to next step 

  2. INSPECT TERMINAL VOLTAGE (VSV FOR AIR INTAKE CONTROL VALVE CONNECTOR) 
    1. Disconnect the VSV for air intake control valve connector
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below

      Standard Voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Switch Condition Specified Condition
      2 - Body ground Engine switch on (IG) 11 to 14 V
    4. Reconnect the VSV connector.
      5. Fig 1: Identifying VSV For Air Intake Control Valve Connector A60
      G05751837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 2 FUSE - VSV FOR AIR INTAKE CONTROL VALVE) 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM) 
    1. Disconnect the VSV for air intake control valve connector
    2. Disconnect the 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 Condition Specified Condition
      A60-1 (VSV for AICV) - E3-8 (AICV) Always Below 1 Ω

      Standard Resistance (Check for Short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A60-1 (VSV for AICV) or E3-8 (AICV) - Body ground Always 10 kΩ or higher
    4. Reconnect the ECM connector
    5. Reconnect the VSV connector
      6. Fig 2: Identifying VSV Connector A60 And ECM Connector E3
      G05751838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM) 

    OK: Go to next step 

  4. INSPECT AIR INTAKE CONTROL VALVE 
    1. Inspect the intake air control valve

    NG: REPLACE AIR CLEANER CASE 

    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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