Kia K4 2025 - Emission Control System

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Maintenance Emission control system
Emission control system
The emission control system of your
vehicle is covered by a written limited
warranty. See the warranty information
contained in the Warranty & Consumer
Information manual in your vehicle.
Your vehicle is equipped with an emis
-
sion control system to meet all applica -
ble emission regulations. There are three
emission control systems, as follows.
1. Crankcase emission control system
2. Evaporative emission control system
3. Exhaust emission control system
To ensure the proper function of the
emission control systems, it is recom
-
mended that you have your vehicle
inspected and maintained by an autho -
rized Kia dealer in accordance with the
maintenance schedule in this manual.
Caution for the Inspection and
Maintenance Test (With Elec
-
tronic Stability Control (ESC) sys -
tem)
僅 To prevent the vehicle from misfir -
ing during dynamometer testing,
turn the ESC off by pressing the
ESC switch.
僅 After dynamometer testing is com -
pleted, turn the ESC back on by
pressing the ESC switch again.
1. Crankcase emission control
system
The Positive Crankcase Ventilation
(PCV) system is employed to prevent air
pollution caused by blow-by gases being
emitted from the crankcase. This system
supplies fresh filtered air to the crank
-
case through the air intake hose. IInside
the crankcase, fresh air mixes with blow-
by gases, which then pass through the
Positive Crankcase Ventilation (PCV)
valve into the induction system.
2. Evaporative emission control
(including Onboard Refueling
Vapor Recovery (ORVR)) system
The ORVR system is designed to prevent
fuel vapors from escaping into the atmo -
sphere. The ORVR system is designed to
allow the vapors from the fuel tank to be
loaded into a canister while refueling at
the gas station, preventing the escape of
fuel vapors into the atmosphere.
Canister
Fuel vapors generated inside the fuel
tank are absorbed and stored in the
onboard canister. When the engine is
running, the fuel vapors absorbed in the
canister are drawn into the surge tank
through the Purge Control Solenoid
Valve (PCSV).
PCSV
The PCSV is controlled by the Engine
Control Module (ECM). When the engine
coolant temperature is low during idling,
the PCSV closes so that evaporated fuel
is not drawn into the engine. After the
engine warms up during ordinary driv
-
ing, the PCSV opens to introduce evapo -
rated fuel to the engine.
3. Exhaust emission control sys -
tem
The exhaust emission control system is a
highly effective system which controls
exhaust emissions while maintaining
good vehicle performance.