Mitsubishi Colt Ralliart. Manual — part 130

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-11

<4A9-CVT>

AK306105

PCV valve

AB

Ventilation hose

Breather hose

Air cleaner

<4G1>

AK401949

PCV valve

Ventilation hose

Breather hose

AD

Air cleaner

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-12

COMPONENT LOCATION (CRANKCASE
EMISSION CONTROL SYSTEM)

M1173007400532

AK304619AD

PCV valve

<4A9>

AK402708AC

PCV valve

<4G1>

POSITIVE CRANKCASE VENTILATION
SYSTEM CHECK

M1173001100566

1. Remove the ventilation hose from the PCV valve.
2. Remove the PCV valve from the rocker cover.
3. Reinstall the PCV valve at the ventilation hose.
4. Start the engine and run at idle.

AK300021AG

PCV valve

<4A9>

AK402417AB

PCV valve

<4G1>

5. Place a finger at the opening of the PCV valve

and check that vacuum of the inlet manifold is felt.
NOTE: At this moment, the plunger in the PCV
valve moves back and forth.

6. If vacuum is not felt, clean the PCV valve or

replace it.

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-13

POSITIVE CRANKCASE VENTILATION
(PCV) VALVE CHECK

M1173001200518

AK401864

PCV valve

AC

<4A9>

AK402418

PCV valve

AB

<4G1>

1. Insert a thin rod into the PCV valve from the side

shown in the illustration (rocker cover installation
side), and move the rod back and forth to check
that the plunger moves.

2. If the plunger does not move, there is a clogging

in the PCV valve. In this case, clean or replace
the PCV valve.

EVAPORATIVE EMISSION CONTROL
SYSTEM

GENERAL INFORMATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)

M1173005100955

The evaporative emission control system prevents
fuel vapours generated in the fuel tank from escaping
into the atmosphere.
Fuel vapours from the fuel tank flow through the fuel
tank pressure control valve and vapour pipe/hose to
be stored temporarily in the canister.
When driving the vehicle, fuel vapours stored in the
canister flow through the purge control solenoid
valve and purge port and go into the inlet manifold to
be sent to the combustion chamber.
When the engine coolant temperature is low or when
the intake air quantity is small (when the engine is at
idle, for example), the engine control unit turns the
purge solenoid off to shut off the fuel vapour flow to
the inlet manifold.
This does not only insure the driveability when the
engine is cold or running under low load but also sta-
bilize the emission level.

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-14

SYSTEM DIAGRAM

AK402831

Canister

Throttle body

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Engine control relay

Purge control
solenoid valve

(ON:

Open

)

AD

Air flow sensor

<4G1>

Engine coolant temperature sensor

Intake air temperature sensor

Barometric pressure sensor
(with

engine-ECU <M/T> or

engine-CVT-ECU <CVT>

)

Manifold absolute
pressure sensor <4A9>

Check valve <4G1>

COMPONENT LOCATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)

M1173007500539

AK304621

Purge control
solenoid valve

AD

<4A9>

AK402842

AB

Purge control
solenoid valve

<4G1>

Main

Index

Group

TOC