GENERAL INFORMATION (EXHAUST
GAS RECIRCULATION SYSTEM)
The
exhaust gas recirculation system lowers the nitrogen oxide (NOx)
emission level.
When the air/fuel mixture combustion temperature is
high, a large quantity of nitrogen oxides
(NOx) is generated in the combustion chamber.
Therefore, this system
recirculates part of emission gas from the exhaust port of the
cylinder head to the combustion chamber through the intake manifold to
decrease the air/fuel
mixture combustion temperature, resulting in reduction of NOx.
The
exhaust gas recirculation flow rate is controlled by the exhaust gas
recirculation
valve so as not to decrease the driveability.
OPERATION
The exhaust gas recirculation valve
is being closed and does not recirculate exhaust gases
under one of the following conditions.
Otherwise, the exhaust gas
recirculation valve is opened and recirculates exhaust
gases.
- The engine coolant temperature is low.
- The engine is at idle.
- The throttle valve is widely opened.
SYSTEM
DIAGRAM
<6G72>
![](../../../img/17/AK602358AC00ENG.png)
<6G75>
![](../../../img/17/AK602172AB00ENG.png)