Mitsubishi Outlander GS45X. Manual — part 1606

EMISSION CONTROL <MFI>

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ENGINE AND EMISSION CONTROL

17-73

<3.0L Engine>

COMPONENT LOCATION

M1173007400844

AK700056 AB

Ventilation hose

Breather hose

Air cleaner

Positive crankcase
ventilation valve

AK503325AE

Positive crankcase ventilation valve
<2.4L engine>

AK700057AC

Positive crankcase ventilation valve
<3.0L engine>

EMISSION CONTROL <MFI>

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ENGINE AND EMISSION CONTROL

17-74

POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM CHECK

M1173001101149

1. Remove the ventilation hose from the positive crankcase

ventilation (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.
7. Apply a small amount of new engine oil to the O-ring on the

PCV valve, and tighten to the specified torque.

Specified torque: 2.5

± 0.4 N⋅m (22 ± 3 in-lb)

POSITIVE CRANKCASE VENTILATION (PCV)
SYSTEM CHECK

M1173001201049

1. Remove the ventilation hose from the positive crankcase

ventilation (PCV) valve.

2. Remove the PCV valve from the rocker cover.
3. Hold the 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.

4. 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.

5. Apply a small amount of new engine oil to the O-ring on the

PCV valve, and tighten to the specified torque.

Specified torque: 2.5

± 0.4 N⋅m (22 ± 3 in-lb)

AK604163

Positive crankcase
ventilation valve

AB

AK604164

Positive crankcase
ventilation valve

Thin rod
(very smooth)

5 10 mm

(0.2 0.3 in)

Vacuum side

AB

EMISSION CONTROL <MFI>

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ENGINE AND EMISSION CONTROL

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EVAPORATIVE EMISSION CONTROL SYSTEM

GENERAL INFORMATION (EVAPORATIVE EMISSION SYSTEM)

M1173005101947

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 can-
ister.
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 ple-
num. 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 pres-
sure sensor monitors the fuel vapor pressure to
detect OBD-II EVAP leaks.
When the fuel tank inner pressure increases due to
the fuel supply, air is released to the atmosphere
from the fuel tank through the EVAP canister and air
filter. When the inner pressure of the fuel tank
decreases, air is supplied to the fuel tank through the
air filter and EVAP canister.

EMISSION CONTROL <MFI>

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ENGINE AND EMISSION CONTROL

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SYSTEM DIAGRAM

COMPONENT LOCATION

M1173007501048

AKA00468

Battery

MFI relay

Evaporative emission
purge solenoid (ON: Open)

Evaporative emission
ventilation solenoid
(ON: Close)

Mass airflow sensor

Intake air temperature
sensor

Manifold absolute
pressure sensor

Engine coolant
temperature sensor

Throttle position sensor

Crankshaft position sensor

AB

ECM

Evaporative
emission canister

Air filter

Fuel tank

AK503323AE

Evaporative emission purge solenoid
<2.4L Engine>

AK900408AB

<3.0L Engine>

Evaporative emission purge solenoid