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ENGINE <TURBO>
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Emission Control System
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
N71BKMAA
The exhaust gas recirculation (EGR) 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 reduc-
tion of
NOx.
OPERATION
When the engine coolant temperature is low, when
the engine is at idle or when a wide open throttle
operation is performed, the EGR valve is kept
closed, achieving no EGR.
In normal vehicle operation performed after warming
up of the engine, the EGR valve is opened to carry
out EGR.
The EGR flow rate is controlled by the EGR valve
so as not to decrease the driveability.
The EGR system contents:
l EGR valve
l EGR solenoid
l Connecting hoses
The engine control module checks the operation
of the EGR system and, if a trouble is detected,
lights the Check Engine/Malfunction indicator lamp
to warn the driver of the trouble.
solenoid
Engine
cOntrOl
module
I
sensor
Volume air flow
6EM0464
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