Intake Air Control System (1MZ-FE/3MZ-FE): Inspection

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

INSPECT INTAKE AIR CONTROL VALVE ASSY NO. 1 (1MZ-FE ONLY)
1. With vacuum of 26.7 kPa (200 mm Hg, 7.9 in. Hg) applied to the actuator, check that the IAC valve closes.
2. minute after applying the vacuum, check that the IAC valve remains closed.
  If the result is not as specified, replace the IAC valve assy No. 1.
  
  NOTE: Do not adjust the screw.
  
  Fig 1: Checking IAC Valve Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT INTAKE AIR CONTROL VALVE ASSY NO. 2
1. Apply 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum to the actuator. Check if the actuator rod pulls the lever and causes the valve to rotate open, as shown in the illustration.
2. One minute after applying the vacuum, check that the actuator rod does not return.
  If the result is not as specified, replace the IAC valve assy No. 2.
  
  Fig 2: Checking Intake Air Control Valve Assy No. 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT INTAKE AIR CONTROL VALVE ASSY NO. 3
1. Apply 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum to the actuator. Check if the valve rotates open, as shown in the illustration.
2. Apply the vacuum for one minute. The actuator should continue to be keeping the valve open.
  If the result is not as specified, replace the IAC valve assy No. 3.
  
  Fig 3: Checking Valve Rotates Open While Applying Vacuum To Actuator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS
1. Cover port C with your finger, and check that air flows from port B to port A.
2. Cover ports 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 mmHg, 18 in.Hg) of vacuum to port B. Check that there is no change in the vacuum after one minute.
  If the result is not as specified, replace air cleaner cap.
  
  Fig 4: Identifying Port A,B & C
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VALVE ASSY, VACUUM SWITCHING FOR IAC VALVE NO. 1 (1MZ-FE ONLY) AND NO. 2
1. Check the VSV resistance.
  Standard:
  
  Fig 5: VSV Resistance Reference Chart (For IAC Valve NO. 1)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.
  
  Fig 6: Checking VSV Terminal Resistance (For IAC Valve NO. 1)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check that air flows from port E to the filter.
    
    Fig 7: 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 the result is not as specified, replace the VSV assy.
  
  Fig 8: Checking Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR IAC VALVE ASSY NO. 3
1. Check the VSV resistance.
  Standard:
  
  Fig 9: VSV Resistance Reference Chart (For IAC Valve NO. 3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy No. 3.
  
  Fig 10: Measuring VSV Terminal Resistance (For IAC Valve NO. 3)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check that air flows port E to the filter.
    
    Fig 11: Checking Air Flows Port E To Filter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery voltage across the terminals. Check that air flows from port E to F.
  If the result is not as specified, replace the VSV assy No. 3.
  
  Fig 12: Checking Air Flows From Port E To F While Applying Battery Voltage Across Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002