Positive Crankcase Ventilation: Highlander
- Remove Positive Crankcase Ventilation (PCV) valve. PCV valve is located at passenger's side front corner of valve cover, just above intake manifold. Apply air pressure to PCV valve at bottom (cylinder head side) of PCV valve. Ensure air flows easily through PCV valve.
- Apply air pressure to PCV valve at vacuum side (intake manifold side) of PCV valve. Ensure air flows through PCV valve with some resistance. Replace PCV valve if valve does not function as described.