Operating principle
To reduce emissions with exhaust gases of harmful substances (CO, HC, NOx) the engine management system has been modified with the addition of special elements. The changes affected the combustion chamber, intake manifold, camshaft and ignition system, which form the main control system.
These systems have been combined into an efficient system that manages emissions reduction while maintaining good overall vehicle handling and fuel economy.
MFI fuel injection system
The MFI fuel injection system uses signals from the heated oxygen sensor to correct the control modes of the fuel injectors installed in the intake manifold for each cylinder, and provides fine adjustment of the air-fuel ratio to reduce exhaust emissions.
This ensures the exit of exhaust gases of a certain composition, which can be further cleaned in a three-way catalytic converter.
Three Way Catalytic Converter Designed to Convert Three Harmful Substances (hydrocarbons (NS), (2) carbon monoxide (SO) And (3) nitrogen oxides (NOx) into safe substances.
The MFI system operates in two modes:
1. According to an open cycle, when the composition of the air-fuel mixture is regulated according to the program embedded in the engine control unit.
2. In a closed loop, when the composition of the air-fuel mixture is controlled based on information from the oxygen sender.
Troubleshooting
Feature | Probable Cause | Elimination method |
Engine won't start or starts with difficulty | Disconnected or damaged vacuum hoses | Repair or replace vacuum hoses |
Violation of functioning of the valve of system of catching of vapors of fuel | Repair or replace evaporative emission valve | |
Unstable idling of the engine, until it stops | Disconnected or damaged vacuum hoses | Repair or replace vacuum hoses |
Malfunctioning crankcase ventilation valve | Repair or replace crankcase ventilation valve | |
Violation of functioning of the valve of system of catching of vapors of fuel | Repair or replace evaporative emission valve | |
Increased oil consumption | Clogged crankcase ventilation system | Check and, if necessary, clean the elements of the forced crankcase ventilation system |