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1. Inspect Ventilation Valve Sub-ASSY

Install a clean hose to the ventilation valve.
Inspect the ventilation valve operation.
1. Blow air into the cylinder head side, and check that air passes through easily.
  CAUTION: Do not suck air through the valve. Petroleum substances inside the valve are harmful.
  
  Fig 1: Inspecting Ventilation Valve Sub-Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Blow air into the intake manifold side, and check that air passes through with difficulty.
If the operation is not as specified, replace the ventilation valve.
Remove the clean hose from the ventilation valve.

Fig 2: Inspecting Ventilation Valve Sub-Assy

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Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002