Intake Air Control System (3MZ-FE): Inspection

INSPECT INTAKE AIR CONTROL VALVE ASSY 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.
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.
  
  Fig 1: Inspecting Intake Air Control Valve Assy No. 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT INTAKE AIR CONTROL VALVE ASSY 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 for continuity
  1. Using an ohmmeter, check for continuity between the terminals.
    Resistance: 37 to 44 Ω at 20°C (68°F)
    
    If there is no continuity, replace the VSV.
    
    Fig 3: Checking Continuity Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Inspect the VSV for ground.
    - Using an ohmmeter, check that there is no continuity between each terminal and the body.
      If there is continuity, replace the VSV.
      
      Fig 4: Inspecting VSV For Ground
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Inspect the VSV operation.
    - Check that air flows from port E to the filter.
      
      Fig 5: Checking Air Flows From Port E To Filter
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    - Apply battery voltage across the terminals.
    - Check that air flows from port E to F.
      If operation is not as specified, replace the VSV.
      
      Fig 6: Checking Air Flows From Port E To F
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. INSPECT AIR CLEANER CAP SUB-ASSY
  1. Cover port C with your finger, and check that air flows from port B to port A.
  2. Cover port C with your finger, and check that air does not flow from port A to port B.
  3. Cover port A and C with your 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.
4. INSPECT VACUUM SWITCHING VALVE ASSY NO.1
  1. Inspect the VSV for open circuit.
    1. Using an ohmmeter, check that there is continuity between the terminals.
      Resistance: 33 to 39 Ω at 20°C (68°F)
      
      If there is no continuity, replace the VSV.
      
      Fig 8: Inspecting VSV For Open Circuit
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Inspect the VSV for ground.
    1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
      If there is continuity, replace the VSV.
      
      Fig 9: Inspecting VSV For Ground
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Inspect the VSV operation.
    1. Check that air flows from port E to the filter.
      
      Fig 10: Checking Air Flows From Port E To Filter
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Apply battery voltage across the terminals.
    3. Check that air flows from port E to port F.
      If operation is not as specified, replace the VSV.
      
      Fig 11: Checking Air Flows From Port E To Port F
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002