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

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. 1 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: Inspecting Intake Air Control Valve Assy No.1
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: Inspecting 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: Inspecting Intake Air Control Valve Assy No.3
  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: Inspecting Vacuum Switching Valve Assy For ACIS
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VALVE ASSY, VACUUM SWITCHING FOR IAC VALVE NO. 1 (1MZ-FE ONLY) AND NO. 2

Check the VSV resistance.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
1 - 2	33 to 39 Ω at 20°C (68°F)
2 - Body ground	10 kΩ or higher
2 - Body ground	10 kΩ or higher

If the result is not as specified, replace the VSV assy.

Fig 5: Checking VSV Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air flows from port E to the filter.
  
  Fig 6: Checking VSV Operation
  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 7: Applying Battery Voltage Across Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.

INSPECT VACUUM SWITCHING VALVE ASSY FOR IAC VALVE ASSY NO. 3

Check the VSV resistance.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
1 - 2	37 to 44 Ω at 20°C (68°F)
1 - Body ground	10 kΩ or higher
2 - Body ground	10 kΩ or higher

If the result is not as specified, replace the VSV assy No. 3.

Fig 8: Checking VSV Resistance

Check VSV operation.
1. Check that air flows from port E to the filter.
  
  Fig 9: Checking VSV Operation
  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 10: Applying Battery Voltage Across Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002