Crankcase Emission Control System: Overview Hyundai Accent III

Scheme 4

Scheme 5

1. After disconnecting the vapor hose from the PCV valve, remove the PCV valve.
2. Reconnect the PCV valve to the vapor hose.
3. 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 at vacuum.
4. If the vacuum is not felt, clean or replace the vapor hose.

Operation Principle

POSITIVE CRANKCASE VENTILATION (PCV) VALVE OPERATION CHART Engine Condition Not Running Idling or Decelerating Normal Operation Accelerating and High Load Vacuum in Intake Manifold 0 High Moderate Low PCV Valve Close Slightly Open Properly Open Fully Open Blow-by Gas Flow 0 Small Medium Large Schematic Diagram Intake Manifold Intake Manifold Intake Manifold Intake Manifold

Scheme 6

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Scheme 9

Scheme 10

1. Disconnect the vapor hose (A).
2. Remove the rubber pad (B), and then remove the PCV valve.

Scheme 11

1. Insert a thin stick (A) into the PCV valve (B) from the threaded side to check that the plunger moves. NOTE: If the plunger does not move (PCV valve is clogged), clean or replace the valve.