Mitsubishi Outlander (2003+). Manual — part 150

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-19

When engine is cold
(Engine coolant temperature: 40

°

C or less)

When engine is hot
(Engine coolant temperature: 80

°

C or higher)

<4G69>

1. Disconnect the vacuum hose (between purge

control solenoid valve and intake maniford) from
purge control solenoid valve and connect a hand
vacuum pump to the nipple.

2. Plug the vacuum hose.
3. When the engine is cold or hot, apply a vacuum of

53 kPa, and check the condition of the vacuum.

When engine is cold
(Engine coolant temperature: 40

°

C or less)

When engine is hot
(Engine coolant temperature: 80

°

C or higher)

PURGE PORT VACUUM CHECK

M1173001500188

<4G63>

1. Disconnect the vacuum hose (red stripe) from the

throttle body and connect a hand vacuum pump to
the nipple.

2. Plug the vacuum hose (red stripe).

3. Start the engine.
4. Check that a fairly constant negative pressure is

generated regardless of the engine speed.

5. If no negative pressure is generated, the port is

probably blocked and should be cleaned.

Engine condition

Normal condition

At idle

Vacuum is maintained.

3,000 r/min

Engine condition

Normal condition

At idle

Vacuum is maintained.

3,000 r/min (within 3
minutes after engine
starts)

Vacuum will leak.

Engine condition

Normal condition

At idle

Vacuum is maintained.

3,000 r/min

AK302831

Plug

Vacuum hose

AB

Engine condition

Normal condition

At idle

Vacuum is maintained.

3,000 r/min (within 3
minutes after engine
starts)

Vacuum will leak.

AK201225

Vacuum hose

Plug

AD

AK100011

AC

Vac-
uum

Engine speed (r/min)

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-20

<4G69>

1. Disconnect the vacuum hose (between purge

control solenoid valve and intake manifold) from
the purge control solenoid valve and connect it to
a hand vacuum pump.

2. Plug the nipple from which the vacuum hose was

removed.

3. Start the engine.
4. Check that a fairly constant negative pressure is

generated regardless of the engine speed.

5. If no negative pressure is generated, the port is

probably blocked and should be cleaned.

PURGE CONTROL SOLENOID VALVE
CHECK

M1173001700234

NOTE: When disconnecting the vacuum hose,
always make a mark so that it can be reconnected at
original position.

1. Disconnect the vacuum hose from the solenoid

valve.

2. Disconnect the harness connector.
3. Connect a hand vacuum pump to nipple (A) of the

solenoid valve (refer to the illustration at left).

4. Check airtightness by applying a vacuum with

voltage applied directly from the battery to the
purge control solenoid valve and without applying
voltage.

5. Measure the resistance between the terminals of

the solenoid valve.

Standard value: 30

−

34

Ω

(at 20

°

C)

AK302833

Plug

Vacuum hose

AB

AK100011

AC

Vac-
uum

Engine speed (r/min)

Battery voltage

Normal condition

Applied

Vacuum leaks

Not applied

Vacuum maintained

AK100012 AC

Battery

A

AK100013

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-21

CANISTER REMOVAL AND INSTALLATION

M1173004200175

Pre-removal and Post-installation Operation
Air cleaner cover and air intake hose removal and installation
(4G63: Refer to GROUP 15 - Air cleaner

P.15-3

) (4G69:

Refer to GROUP 15 - Air cleaner

P.15-4

).

AC212494

1

2

3

4

5

6

7

8

AB

Removal steps

1.

Purge hose connection

2.

Vapour hose

3.

Vent connector

4.

Vapour hose

5.

Hose clamp

6.

Canister

7.

Fuel high-pressure hose clamp
<4G63>

8.

Canister bracket

Removal steps (Continued)

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-22

EXHAUST GAS RECIRCULATION
(EGR) SYSTEM

GENERAL INFORMATION (EGR SYSTEM)

M1173005200349

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 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
recirculate exhaust gases under one of the following
conditions.
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.

SYSTEM DIAGRAM
<4G63>

AK204368 AB

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