Mitsubishi Outlander GS45X. Manual - part 1606

EMISSION CONTROL <MFI>

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ENGINE AND EMISSION CONTROL

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<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

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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