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