Mitsubishi L200. Manual — part 233
EMISSION CONTROL
ENGINE AND EMISSION CONTROL
17-36
<Except Euro5>
AK500419
Waste gate
actuator
Catalytic
converter
EGR valve (DC motor)
Engine coolant
temperature sensor
Air
Injector
From fuel
tank
To fuel tank
To brake system
AB
Intake air temperature sensor No. 2
EGR valve position sensor
EMISSION CONTROL
ENGINE AND EMISSION CONTROL
17-37
VACUUM CIRCUIT DIAGRAM
M1175004400380
<Euro5>
AKB00241
White paint
B
B
B
R
R
Vacuum
pump
Variable geometry
turbocharger
Variable
geometry
control
solenoid valve
Vacuum hose colour
B : Black
R : Red
AB
VACUUM HOSE CHECK
M1175004900307
1. Using the vacuum circuit diagram as a guide,
check to be sure that the vacuum hoses are
correctly connected.
2. Check the connection condition of the vacuum
hoses, (removed, loose, etc.) and check to be
sure that there are no bends or damage.
VACUUM HOSE INSTALLATION
M1175005000288
1. When connecting the vacuum hoses, they should
be securely inserted onto the nipples.
2. Connect the hoses correctly, using the vacuum
circuit diagram as a guide.
EXHAUST GAS RECIRCULATION
(EGR) SYSTEM
GENERAL INFORMATION (EGR SYSTEM)
M1175002600399
The electronically controlled EGR system consists of
an EGR valve, engine-ECU and sensors.
The EGR valve aims at reducing the amount of NOx
(nitric oxide) discharge that increases with the rise in
the exhaust gas temperature. Thus, the engine-ECU
optimally controls the exhaust gas temperature in
accordance with the operating conditions of the
engine.
EMISSION CONTROL
ENGINE AND EMISSION CONTROL
17-38
To further improve the exhaust gas reduction per-
formance, the system provides the engine-ECU
feedback on the EGR valve opening. Thus, it effects
EGR control to optimize the operating conditions of
the engine.
SYSTEM DIAGRAM
AKB00296
Engine coolant temperature sensor
Crank angle sensor
Air flow sensor
EGR valve position sensor
EGR valve
(DC motor)
EGR cooler
Engine-ECU
AB
Vehicle speed sensor
A/C switch
A/C load signal
Manifold absolute pressure sensor
Barometric pressure sensor
Intake a
ir temperature sensor
No. 1
Intake a
ir temperature sensor
No. 2 <Except Euro5>
EGR gas temperature sensor
<Euro5>
COMPONENT LOCATION
M1175003900304
AK500430
EGR valve
(in which
EGR valve position sensor built)
AE
AKB00297AB
<Euro5>
EGR gas
temperature
sensor
EGR VALVE (DC MOTOR) CHECK
M1175004600179
System check
AK500430
EGR valve
(in which
EGR valve position sensor built)
AE
EMISSION CONTROL
ENGINE AND EMISSION CONTROL
17-39
1. Connect the M.U.T.-III to the diagnosis connector
to check for date list item No.16.
2. Start the engine, and warm up the engine.
3. Raise the engine speed gradually, and make sure
that the valve open degree changes from 0% to
100%.
Operation check
AK500440
1
2 3
4
5 6
AB
EGR valve
1. Remove the EGR valve.
AK500441
1
2 3
4
5 6
AB
5 V
5 V
2. Connect the terminal (+) of the sensor power
supply (5V) with the terminal No.3 of the EGR
valve connector, and connect the terminal (
−) of
the sensor power supply (5V) with the terminal
No. 2.
3. A tester is to be connected between the terminal
No.1 and No. 2.
4. Connect the terminal (+) of the power supply with
the terminal No. 6 of the EGR valve connector,
and connect the terminal (
−) of the power supply
with the terminal No. 4. Confirm the EGR valve is
opened.
NOTE: At this time, the power supply voltage is to
be 5V. When the valve is not opened, increase the
voltage 1V by 1V. For each voltage, current is to
be applied within 5 seconds. Once the valve is
opened, the voltage is not to be increased any
more.
AK500442AB
Valve open
5. Confirm the voltage is changed between the
terminal No. 1 and No. 2 together with the EGR
valve opening movement.
6. By the voltage changed, the DC is recognized as
being normal
7. Use a new gasket and tighten the installation bolt
to the tightening torque.
Tightening torque: 48
± 6 N⋅m
Cleaning the EGR valve
CAUTION
Do not use a solvent or detergent, which could
enter the motor and cause it to malfunction.
1. Remove the EGR valve and check that the EGR
valve is not stuck or clogged with carbon deposits.
Use a wire brush to clean the valve if necessary.
2. Using a new gasket, install the EGR valve by
tightening its mounting bolts to the specified
torque.
Tightening torque: 48
± 6 N⋅m
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