PCV Valve: Inspection

INSPECT VENTILATION VALVE
1. Install a clean hose to the ventilation valve.
2. Check the ventilation valve operation.
  1. Blow air into the cylinder head side, and check that air passes through easily.
    NOTE: Do not suck air through the valve. Petroleum substances inside the valve are hazardous to your health.
    
    Fig 1: Checking Air Passes (Blow Air Into Cylinder Head Side)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Blow air into the intake manifold side, and check that air passes through with difficulty. If the result is not as specified, replace the ventilation valve.
3. Remove the clean hose from the ventilation valve.
  
  Fig 2: Checking Air Passes Through With Difficulty From Intake Manifold Side
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002