Hyundai Tucson (NX4) 2022-2025 Service Manual / Emission Control System / Crankcase Emission Control System / Positive Crankcase Ventilation (PCV) Valve

Hyundai Tucson: Crankcase Emission Control System / Positive Crankcase Ventilation (PCV) Valve

- Description Pressure Regulating Valve (PRV) is installed to prevent the over pressure of combustion gas through the piston ring and onto the crankcase.

- Operating Principle

Engine condition	Stop	Idle or Deceleration	Normal operating condition	Accelerating in the high load area
Intake manifold pressure	0	High	Appropriate	Low
PRV (Diaphragm)	Full open	A little open	Appropriate open	Considerable open
Amount of blow-by gas	0	A little	Middle	A lot
Diaphragm component part

- Removal

1.Remove the cylinder head cover.Refer to Engine Mechanical System - "Cylinder Head Cover")

- Installation

1.Install in the reverse order of removal.

Description and Operation

- Description A : Crankcase pressure regulating valve (PRV)B : Breather hoseC : Intake hoseD : Air flowE : Intake manifoldF : Cylinder block ① Blow-by gas flow② Blow-by gas inflow to the c ...

Crankcase Check Valve

- Removal and Installation • Be careful not to damage the parts located under the vehicle (floor under cover, canister, fuel tank) when raising the vehicle using the lift. ...

Other information:

Hyundai Tucson (NX4) 2022-2025 Service Manual: Engine Oil
- Replacement • Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points") • Prolonged ...

Hyundai Tucson (NX4) 2022-2025 Owner's Manual: Daytime Running Lights (DRL)
The Daytime Running Lights can make it easier for others to see the front of your vehicle during the day, especially after dawn and before sunset. The DRL system is ON when the headlight switch is in the OFF or the AUTO headlight position and the Electronic Parking Brake is released. It ...