Intake Air Control System: Inspection

INSPECT INTAKE AIR CONTROL VALVE
1. With 39.9 kPa (300 mmHg, 11.8 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves.
2. One minute after applying the vacuum in step ( a), check that the actuator rod does not return.
  If operation is not as specified, replace the intake manifold.
  
  Fig 1: Inspecting Intake Air Control Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR IAC VALVE
1. Using an ohmmeter, check that there is continuity between each terminal.
  Resistance: 33 to 39 Ω at 20°C (68°F)
  
  If there is no continuity, replace the VSV.
  
  Fig 2: Checking Continuity Between Each Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
  Resistance: 10 kΩ or higher
  
  If there is continuity, replace the VSV.
  
  Fig 3: Checking There Is No Continuity Between Each Terminal & Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check that air flows from port E to the filter.
  
  Fig 4: Checking Air Flows From Port E To Filter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Apply battery voltage across the terminals.
5. Check that air flows from port E to port F.
  If operation is not as specified, replace the VSV.
  
  Fig 5: Checking Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002