Intake Air Control System: Inspection

WARNING: This page is about a different car, the 2004 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT 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.
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.
INSPECT INTAKE AIR CONTROL VALVE ASSEMBLY NO. 3
1. Inspect actuator operation
  
  Fig 2: Inspecting Intake Air Control Valve Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 the resistance between the terminals.
    
    Fig 3: Using An Ohmmeter, Check Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Resistance: 37 to 44 Ω at 20°C (68°F)
    
    If the resistance is not as specified, replace the VSV.
  2. Inspect the VSV for ground.
    - Using an ohmmeter, check that there is no continuity between each terminal and the body.
    Fig 4: Using An Ohmmeter, Check Continuity Between Each Terminal And Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If there is continuity, replace the VSV.
  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 port F.
    Fig 6: Checking Air Flows From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If operation is not as specified, replace the VSV.
INSPECT AIR CLEANER CAP SUB-ASSEMBLY
1. Cover port C with finger, and check that air flows from port B to port A.
  
  Fig 7: Checking Air Flows From Port B To Port A
  Courtesy 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.
INSPECT VACUUM SWITCHING VALVE ASSEMBLY NO. 1
1. Inspect the VSV for open circuit.
  1. Using an ohmmeter, check the resistance between the terminals.
    
    Fig 8: Using An Ohmmeter, Check Resistance Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Resistance: 33 to 39 Ω at 20°C (68°F)
  If the resistance is not as specified, replace the VSV.
2. Inspect the VSV for ground.
  1. Using an ohmmeter, check that there is no continuity between each terminal and the body.
  Fig 9: Using An Ohmmeter, Check Continuity Between Each Terminal And Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If there is continuity, replace the VSV.
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.
  Fig 11: Checking Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the VSV.