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.
Fig 1: Inspecting Intake Air Control Valve Assy No.2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: Do not adjust the adjust screw.
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.
  Fig 2: Inspecting Intake Air Control Valve Assy No.3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 VSV For 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: Checking VSV For No Continuity Between Each Terminal And Body
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Inspect the VSV operation.
    - Check that air flows from port E to the filter.
      
      Fig 5: Checking That 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 That Air Flows From Port E To F
      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  
  Fig 7: Inspecting Air Cleaner Cap Sub-Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 Continuity
    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: Checking VSV For No Continuity Between Each Terminal And Body
    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 That 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 That Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002