Mitsubishi Outlander XL. Manual — part 468

VACUUM HOSE INSTALLATION

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1.

When connecting the vacuum hoses, they should be securely
inserted onto the nipples.

2.

Connect the hoses correctly, using the VACUUM HOSE
ROUTING diagram as a guide.

VACUUM HOSE CHECK

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1.

Using the VACUUM HOSE ROUTING diagram as a guide,
check that the vacuum hoses are correctly connected.

2.

Check the connection of the vacuum hoses, (removed, loose,
etc.) and confirm that there are no sharp bends or damage.

POSITIVE CRANKCASE VENTILATION SYSTEM

GENERAL INFORMATION (POSITIVE CRANKCASE VENTILATION SYSTEM)

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The positive crankcase ventilation (PCV) system
prevents the escape of blow-by gases from inside the
crankcase into the atmosphere.
Fresh air is sent from the air cleaner into the
crankcase through the breather hose to be mixed with
the blow-by gas inside the crankcase.
The blow-by gas inside the crankcase is drawn into
the intake manifold through the PCV valve.

The PCV valve is designed to lift 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.

EMISSION CONTROL <MFI>

17c-7

VACUUM HOSES

SYSTEM DIAGRAM

ZK600373 AA00

Ventilation hose

Breather hose

Air cleaner

Positive crankcase
ventilation valve

COMPONENT LOCATION

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Positive crank case ventilation valve

ZK600374AA00

POSITIVE CRANKCASE VENTILATION SYSTEM

CHECK

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1.

Remove the positive crankcase ventilation (PCV) valve from
the rocker cover, then reconnect the PCV valve to the vacuum
supply hose.

17c-8

EMISSION CONTROL <MFI>

POSITIVE CRANKCASE VENTILATION SYSTEM

ZK600375AA00

Positive crankcase
ventilation valve

2.

With the engine idling, put your finger on the open end of the
PCV valve, and check for negative pressure (vacuum).

NOTE:

At this time, the plunger in the PCV valve should

move back and forth as the open end is covered and
uncovered.

3.

If negative pressure is not felt, clean or replace the PCV valve.
Inspect the vacuum supply hose and vacuum supply hose port
for restriction or plugged condition.

POSITIVE CRANKCASE VENTILATION VALVE

CHECK

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ZK600376 AA00

5 – 10 mm

(0.2 – 0.3 in)

Thin rod
(very smooth)

Positive
crankcase
ventilation
valve

Vacuum side

1.

Hold the positive crankcase ventilation (PCV) valve with the
vacuum side down. Insert a thin rod, and using light pressure,
depress the end of the PCV valve spring by 5 - 10 mm (0.2 -
0.3 inch). Release pressure on the rod to see if the PCV valve
spring will lift the rod to its original position.

2.

If the rod returns quickly to its original position, the PCV valve
is OK. If the stick does not return quickly, clean or replace the
PCV valve.

EVAPORATIVE EMISSION CONTROL SYSTEM

GENERAL INFORMATION (EVAPORATIVE EMISSION SYSTEM)

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The evaporative emission (EVAP) system prevents
fuel vapors generated in the fuel tank from escaping
into the atmosphere.
Fuel vapors from the fuel tank flow through the vapor
pipe/hose to be stored temporarily in the EVAP
canister.
When the vehicle is in operation, fuel vapors stored in
the EVAP canister flow through the EVAP purge
solenoid, purge port and intake manifold plenum 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 module (ECM)
brings the EVAP purge solenoid into the OFF state to
shut off the fuel vapor flow to the intake manifold
plenum. This ensures driveability when the engine is
cold or running under low load and also stabilizes the
emission level.

An EVAP ventilation solenoid is provided between the
EVAP canister and atmosphere to monitor for OBD-II
EVAP leaks. This solenoid is normally OFF. However,
it turns ON when monitoring the OBD-II EVAP leaks
and shuts off the atmosphere flow to the EVAP
canister. Then the fuel tank differential pressure
sensor monitors the fuel vapor pressure to detect
OBD-II EVAP leaks. The fuel overflow limiter valve
and the leveling valve prevent fuel from being
overfilled. The fuel overflow limiter valve and the
leveling valve prevents fuel leaks if the vehicle is rolled
over in an accident.
The EVAP ventilation valve releases the air from the
fuel tank through the EVAP canister into the
atmosphere when the fuel tank pressure increases
due to refueling, etc. The EVAP ventilation valve and
the air filter supply the atmospheric air to the EVAP
canister when the fuel tank pressure decreases.

EMISSION CONTROL <MFI>

17c-9

POSITIVE CRANKCASE VENTILATION SYSTEM

SYSTEM DIAGRAM

ZK602753

ECM

Evaporative
emission purge
solenoid

Evaporative
emission canister

MFI relay

Mass airflow sensor

Intake air temperature
sensor

Engine coolant
temperature sensor

Throttle position sensor

Crankshaft position sensor

Manifold absolute
pressure sensor

Battery

AA00

COMPONENT LOCATION

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ZK600378

Evaporative emission purge solenoid

AA00

ZK600379AA00

Evaporative emission ventilation solenoid

Spare tire

17c-10

EMISSION CONTROL <MFI>

EVAPORATIVE EMISSION CONTROL SYSTEM