Kia Optima DL3: Emission Control System

Kia Optima DL3 2019-2026 Service and Repair Manual / Emission Control System

Service data

Specifications

Purge Control Solenoid Valve (PCSV)

▷ Specification

Item	Specification
Coil Resistance (Ω)	22.0 - 26.0 [20°C (68°F)]

Tightening torque

Tightening Torques

Item	kgf.m	N.m	lb-ft
Positive Crankcase Ventilation (PCV) Valve	0.2 - 0.3	1.96 - 2.94	1.45 - 2.17

Description and operation

Description

Emissions Control System consists of three major systems.

•	Crankcase Emission Control System prevents blow-by gas from releasing into the atmosphere. This system recycles gas back into the intake manifold (Closed Crankcase Ventilation Type).

•	Evaporative Emission Control System prevents evaporative gas from releasing into the atmosphere. This system burns gas at appropriate engine operating condition after gathering it in the canister.

•	Exhaust Emission Control System converts the three pollutants [hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx)] into harmless substances by using the 3-way catalytic converter.

Troubleshooting

Symptom	Suspect Area
Engine will not start or stuggle to start	Vapor hose damaged or disconnected
Engine stuggle to start	Malfunction of the Purge Control Solenoid Valve
Rough idle or engine stalls	Vapor hose damaged or disconnected
Rough idle or engine stalls	Malfunction of the PCV valve
Rough idle	Malfunction of the Evaporative Emission Control System
Excessive oil consumption	Positive crankcase ventilation line clogged

Schematic diagrams

Schematic Diagram

Components and components location

Components Location

1. PCV valve
2. Canister
3. Purge control solenoid valve (PCSV)
4. Fuel Tank Air Filter
5. Catalytic converter (WCC)

6. Catalytic converter (UCC)
7. Leveling Tube
8. Vapor Hose (Canister ↔ Fuel Tank)
9. Ventilation Hose (Canister ↔ Atmosphere)

1. PCV valve	2. Canister

3. Purge control solenoid valve (PCSV)	4. Fuel Tank Air Filter

5. Catalytic converter (WCC)	6. Catalytic converter (UCC)

7. Leveling Tube 8. Vapor Hose (Canister ↔ Fuel Tank) 9. Ventilation Hose (Canister ↔ Atmosphere)

Crankcase Emission Control System

Positive Crankcase Ventilation (PCV) Valve

Evaporative Emission Control System

Exhaust Emission Control System

❮Starter Relay

Repair procedures Inspection 1. Disconnect the negative battery (-) terminal. 2. Remove the fuse box cover.

Crankcase Emission Control System❯

Schematic diagrams Schematic Diagram Repair procedures Inspection 1. After disconnecting the vapor hose from the PCV valve, remove the PCV valve.

Other information:

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