2002 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Intake Air Control System: Inspection

  1. Intake air control valve assembly.
    1. With 26.7 kPa(200 mm Hg, 7.9 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves.
      Fig 1: Displaying Intake Air Control Valve
      G01207192Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. One minute after applying the vacuum, check that the actuator rod does not return.
    3. If the operation is not as specified, replace the intake air control valve assembly.
  2. Intake air control valve assembly No. 2.
    1. With 26.7 kPa (200 mm Hg, 7.9 in. Hg) of vacuum applied to the actuator, check that the actuator rod moves.
      Fig 2: Displaying Intake Air Control Valve No. 2
      G01207193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. One minute after applying the vacuum, check that the actuator rod does not return.
    3. If the operation is not as specified, replace the intake air control valve assembly No. 2.
    NOTE: Do not adjust the adjust screw.
  3. Intake air control valve assembly No. 3.
    1. Inspect actuator operation.
      1. With 26.7 kPa (200 mm Hg, 7.9 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves.
      2. One minute after applying the vacuum, check that the actuator rod does not return.
      3. If the operation is not as specified, replace the intake air control valve No. 3
    2. Inspect VSV operation.
      1. Using an ohmmeter, check that there is continuity between each terminals.

        Resistance:  37-44 ohms at 20°C (68°F)

        Fig 3: Inspecting VSV Operation
        G01207194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Check that air flows form port "E" to the filter.
      3. Apply battery voltage across the terminals.
      4. Check that air flows from port "E" to port "F".
  4. Air cleaner cap sub-assembly.
    1. Cover port "C" with finger, and check that air flows form port "B" to port "A".
      Fig 4: Displaying Air Cleaner Cap
      G01207195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Cover port "C" with finger, and check that air does not flow from port "A" to port B.
    3. Cover port "A" and "C" with fingers, and apply 60 kPa (450 mm Hg, 18 in.Hg) of vacuum to port "B", and check that there is no change of vacuum after one minute.
  5. Vacuum switching valve assembly No. 1.
    1. Using an ohmmeter, check that there is continuity between each terminals.

      Resistance:  33-39 ohms at 20°C (68°F)

      Fig 5: Vacuum Switching Valve
      G01207196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that air flows form port "B" to the filter.
    3. Apply battery voltage across the terminals.
    4. Check that air flows from port "B" to port "A".
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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.
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