Crankcase Emission Control System: Overview Hyundai Elantra III facelift

Scheme 4

Scheme 5

1. Disconnect the ventilation hose from the positive crankcase ventilation (PCV) valve. Remove the PCV valve from the rocker cover and reconnect it to the ventilation hose.
2. Run the engine at idle and put a finger on the open end of the PCV valve and make sure that intake manifold vacuum can be felt. NOTE: The plunger inside the PCV valve will move back and forth.

Operation

OPERATION CHART Engine condition Not running Engine condition Idling or decelerating PCV valve Not operating PCV valve Fully operating Vacuum passage Restricted Vacuum passage Small Engine condition Normal operation Engine condition Accelerating and high load PCV valve Properly operating PCV valve Slightly operating Vacuum passage Large Vacuum passage Very large

Scheme 6

Scheme 7

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Scheme 9

Scheme 10

1. Disconnect the vacuum hose (A) and remove the PCV valve (B).

Scheme 11

1. Remove the PCV valve.
2. Insert a thin stick (A) into the PCV valve (B) from the threaded side to check that the plunger moves.
3. If the plunger does not move, the PCV valve is clogged. Clean it or replace.