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 Service Manual: Head Lamps Repair procedures
Inspection 1. Check the battery voltage. (Low beam will be on when the battery voltage above 9V.) 2. Check the fuse and relay. 3. Check the polarity of ballast. (If the polarity are changed, low beam doesn't lighten) 4. Check the bulb connector securely. 5. Visually bulb checking ...

Hyundai Sonata LF 2014-2019 Owners Manual: Seat Warmers and Air Ventilation Seats
Seat warmers Seat warmers are provided to warm the seats during cold weather. WARNING The seat warmers can cause a serious burn, even at low temperatures and especially if used for long periods of time. Passengers must be able to feel if the seat is becoming too warm so they can turn it off, if ne ...