Hyundai Sonata: Exhaust Emission Control System / Description and Operation

Hyundai Sonata LF 2014-2019 Service Manual / Emission Control System / Exhaust Emission Control System / Description and Operation

Description

Exhaust emissions (CO, HC, NOx) are controlled by a combination of engine modifications and the addition of special control components.

Modifications to the combustion chamber, intake manifold, camshaft and ignition system form the basic control system.

These items have been integrated into a highly effective system which controls exhaust emissions while maintaining good drivability and fuel economy.

Air/Fuel Mixture Control System [Multiport Fuel Injection (MFI) System]

The MFI system uses signals from the heated oxygen sensor to activate and control the injector installed in the manifold for each cylinder, thus precisely regulating the air/fuel mixture ratio and reducing emissions.

This in turn allows the engine to produce exhaust gas of the proper composition to permit the use of a three way catalyst. The three way catalyst is designed to convert the three pollutants [hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx)] into harmless substances. There are two operating modes in the MFI system.

1.	Open Loop air/fuel ratio is controlled by information programmed into the ECM.

2.	Closed Loop air/fuel ratio is adjusted by the ECM based on information supplied by the oxygen sensor.

Exhaust Emission Control System

...

Catalytic Converter Description and Operation

Description The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen (NOx). [ ...

Other information:

Hyundai Sonata LF 2014-2019 Owners Manual: Brake Fluid
Checking the Brake Fluid Level Check the fluid level in the reservoir periodically. The fluid level should be between MAX and MIN marks on the side of the reservoir. Before removing the reservoir cap and adding brake fluid, clean the area around the reservoir cap thoroughly to prevent brake fluid ...

Hyundai Sonata LF 2014-2019 Owners Manual: Occupant Classification System (OCS)
Your vehicle is equipped with an Occupant Classification System (OCS) in the front passenger's seat. Main components of the Occupant Classification System A detection device located within the front passenger seat cushion. Electronic system to determine whether the passenger air bag systems sho ...