Mitsubishi Lancer. Manual - part 216

Battery voltage

Normal condition

Applied

Vacuum leaks

Not applied

Vacuum maintained

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-12

5. Measure the resistance between the terminals of 

the solenoid valve.

Standard value: 30 

− 34 Ω (at 20° C)

FUEL VAPOUR CANISTER REMOVAL AND INSTALLATION

M1173004200153

Pre-removal and Post-installation Operation
Air Cleaner Assembly Removal and Installation (Refer to 
GROUP 15 

P.15-3

).

AC208253

1

2

3

4

5

6

7

8

AD

Removal steps 

1.

Emission vacuum hose connection

2.

Fuel vapour control line hose

3.

Fuel vapour control check valve

4.

Fuel vapour control line hose

5.

Fuel vapour control line clamp

6.

Fuel vapour canister

7.

Fuel high-pressure hose clamp

8.

Fuel vapour canister bracket

EXHAUST GAS RECIRCULATION 
(EGR) SYSTEM

GENERAL INFORMATION (EGR SYSTEM)

M1173005200327

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 tempera-
ture, resulting in reduction of NOx.
The EGR flow rate is controlled by the EGR valve so 
as not to decrease the driveability.

OPERATION

The EGR valve is being closed and does not recircu-
late exhaust gases under one of the following condi-
tions.
Otherwise, the EGR valve is opened and recirculates 
exhaust gases.

• The engine coolant temperature is low.

• The engine is at idle.

• The throttle valve is widely opened.

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-13

SYSTEM DIAGRAM

AK300775

Manifold absolute 
pressure (MAP) sensor

Engine-ECU <M/T>,
Engine-A/T-ECU <A/T>

Engine coolant
temperature sensor

Crank angle sensor

EGR
control
solenoid
valve

EGR valve

OFF

ON

Control
relay

Battery

AB

<4G1>

AK302349 AB

<4G6>

EGR
control
Solenoid
valve

EGR valve

OFF

ON

Control
relay

Battery

Engine-ECU

Barometric pressure
sensor

Air flow sensor

Engine coolant
temperature sensor

Crank angle sensor

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-14

COMPONENT LOCATION (EGR SYSTEM)

M1173007600224

AK300776

<4G1>

AB

EGR control
solenoid valve

AK300778

<4G6>

AB

EGR control
solenoid valve

AK300777

<4G1>

AB

EGR valve

AK300779AB

<4G6>

EGR valve

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-15

EGR SYSTEM CHECK

M1173002600348

AK300780 AB

<4G1>

EGR valve

Green stripe

Three-way 
terminal

AK300781AB

<4G6>

EGR valve

Green stripe

Three-way 
terminal

1. Disconnect the vacuum hose (Green stripe) from 

the EGR valve, and then connect a hand vacuum 
pump via the three-way terminal.

2. When the engine is hot or cold, check the 

condition of vacuum by racing the engine.

When engine is cold 

 

(Engine coolant temperature: 20

° C or less)

Throttle valve

Normal vacuum condition

Open quickly

No vacuum will generate (the 
same as barometric pressure.)

When engine is hot 

 

(Engine coolant temperature: 80

° C or higher)

Throttle valve

Normal vacuum condition

Open quickly

It will momentarily rise over 13 
kPa

3. Disconnect the three-way terminal.

AK300782 AB

<4G1>

EGR valve

Green stripe

AK300783AB

<4G6>

EGR valve

Green stripe

4. Connect the hand vacuum pump to the EGR 

valve nipple.

5. Check whether the engine stalls or the idling is 

unstable when a vacuum of 30 kPa or higher is 
applied during idling.

EGR VALVE CHECK

M1173002800223

1. Remove the EGR valve and inspect for sticking, 

carbon deposits, etc. If found, clean with a 
suitable solvent so that the valve seats correctly.

2. Connect a hand vacuum pump to the EGR valve.
3. Apply 67 kPa of vacuum, and check that the 

vacuum is maintained.

AKX00348

4. Apply a vacuum and check the passage of air by 

blowing through one side of the EGR passage.

Vacuum

Passage of air

5.3 kPa or less

Air is not blown out

27 kPa or more

Air is blown out