Exhaust Gas Recirculation (Egr) System; General Information; Operation; System Diagram - Mitsubishi Pajero Pinin 1999 Workshop Manual

ENGINE AND EMISSION CONTROL ±

EXHAUST GAS RECIRCULATION (EGR) SYSTEM

GENERAL INFORMATION

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

OPERATION

The EGR valve is being closed and dose not
recirculate exhaust gases under one of the following
conditions. Otherwise, the EGR valve is opened
and recirculate exhaust gases.

SYSTEM DIAGRAM

COMPONENT LOCATION

EGR valve
Throttle
body
EGR valve
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 EGR flow rate is controlled by the EGR valve
so as not to decrease the driveability.
Throttle body
Control
relay
EGR valve
(Stepper
motor)
Battery
Emission Control System
The engine coolant temperature is low.
The engine is at idle.
The throttle valve is widely opened.
Engine-ECU
Throttle position sensor
17-13
Air flow sensor
Engine coolant tem-
perature sensor
Crank angle sensor