Mitsubishi Outlander (2003+). Manual — part 149
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-15
CRANKCASE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173005000334
The crankcase emission control system prevents
blow-by gases from escaping inside the crankcase
into the atmosphere.
Fresh air is sent from the air cleaner into the
crankcase through the breather hose.
The air becomes mixed with the blow-by gases
inside the crankcase.
The blow-by gas inside the crankcase is drawn into
the intake manifold through the positive crankcase
ventilation (PCV) valve.
The PCV valve lifts the plunger according to the
intake manifold vacuum so as to regulate the flow of
blow-by gas properly.
In other words, the blow-by gas flow is regulated
during low load engine operation to maintain engine
stability, while the flow is increased during high load
operation to improve the ventilation performance.
SYSTEM DIAGRAM
COMPONENT LOCATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173007400242
AK204365
Air cleaner
Air
Ventilation hose
Breather hose
PCV valve
AB
AK204366AD
PCV valve
<4G63>
AK302826
PCV valve
<4G69>
AB
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-16
POSITIVE CRANKCASE VENTILATION
SYSTEM CHECK
M1173001100221
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.
5. Place a finger at the opening of the PCV valve
and check that vacuum of the intake 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.
POSITIVE CRANKCASE VENTILATION
(PCV) VALVE CHECK
M1173001200217
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.
AK300021
PCV valve
AC
AK300022
PCV valve
AC
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-17
EVAPORATIVE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)
M1173005100427
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 gurge control solenoid
valve and purge port and go into the intake 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 intake manifold.
This does not only insure the driveability when the
engine is cold or running under low load but also
stabilize the emission level.
SYSTEM DIAGRAM
<4G63>
AK204367AB
Throttle body
Canister
From
fuel
tank
OFF
ON
Purge
control
Solenoid
valve
Control
relay
Battery
Engine-ECU
Air flow sensor
Engine coolant
temperature sensor
Intake air
temperature sensor
Barometric pressure
sensor
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-18
<4G69>
COMPONENT LOCATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)
M1173007500238
PURGE CONTROL SYSTEM CHECK
M1173001400318
<4G63>
1. Disconnect the vacuum hose (red stripe) from
throttle body and connect it to a hand vacuum
pump.
2. Plug the nipple from which the vacuum hose was
removed.
3. When the engine is cold or hot, apply a vacuum of
53 kPa, and check the condition of the vacuum.
AK302829AB
Intake manifold
Canister
From
fuel
tank
OFF
ON
Purge
control
Solenoid
valve
Control
relay
Battery
Engine-ECU <M/T> or
Engine-A/T-ECU <A/T>
Air flow sensor
Engine coolant
temperature sensor
Intake air
temperature sensor
Barometric pressure sensor
(with engine-ECU <M/T>
or engine-A/T-ECU <A/T>)
AK201217
Purge control
solenoid valve
AD
<4G63>
AK302830
<4G69>
Purge control
solenoid valve
AB
AK201220
Vacuum hose
Plug
AC
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