Hyundai Elantra (CN7): Exhaust Emission Control System / Description and operation

Hyundai Elantra (CN7) 2021-2026 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.

    Description and operation DescriptionThe 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).

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    Hyundai Elantra (CN7) 2021-2026 Service Manual: Compressor oil

    Repair procedures Oil Specification1.The HFC-134a system requires synthetic (PAG) compressor oil whereas the R-12 system requires mineral compressor oil. The two oils must never be mixed.2.Compressor (PAG) oil varies according to compressor model. Be sure to use oil specified for the model of compressor.

    Hyundai Elantra (CN7) 2021-2026 Service Manual: Description and operation

    Description and OperationBlcok Diagram    â€¢ This system monitors the driving situations through the radar and the camera. Thus, for a situation out of the sensing range, the system may not normally operate. The System may be limited when : • The radar sensor or camer

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