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