Mitsubishi Evolution X. Manual - part 225

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-69

AUTO-CRUISE CONTROL SWITCH

REMOVAL AND INSTALLATION

M1172007600072

Refer to GROUP 37, Steering Wheel 

P.37-22

.

EMISSION CONTROL <MFI - T/C>

GENERAL INFORMATION

M1173000101243

The emission control system consists of the fol-

lowing subsystems:

• Positive crankcase ventilation (PCV) system

• Evaporative emission system

• Exhaust emission control system

SERVICE SPECIFICATIONS

M1173000301098

Item

Standard value

Emission control system
Evaporative emission purge solenoid coil resistance [at 20

° C (68° F)] Ω

22 

− 26

Evaporative emission ventilation solenoid coil resistance [at 20

° C (68° F)] Ω

17 

− 21

Purge flow cm

3

/s (SCFH) [at 80 

− 95° C (176 − 205° F) with sudden revving]

20 (2.5)

DIAGNOSIS

M1173000700231

SYMPTOM

PROBABLE CAUSE

REMEDY

Engine will not start or hard 
to start

Vacuum hose disconnected or damaged

Repair or replace

Malfunction of the evaporative emission 
purge solenoid

Repair or replace

Rough idle or engine stalls

Vacuum hose disconnected or damaged.

Repair or replace

Malfunction of the PCV valve

Replace

Malfunction of the purge control system

Check the system; If there is a 
problem, check its component 
parts.

Excessive oil consumption

PCV line clogged

Check PCV system

SPECIAL TOOLS

M1173000600773

Tool

Tool number and name

Supersession

Application

MB995061
Purge flow indicator

MLR6890A
Part of MIT280220

Inspection of purge control 
system

B991953

MB991953 
Oxygen sensor wrench

MB991953-01

Removal and installation 
of heated oxygen sensor 
(rear)

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-70

VACUUM HOSES

VACUUM HOSE ROUTING

M1173000901346

AK704213

B

B

B

B

B

B

B

W

B

R

Y

W

B

B

B

B

Intake manifold plenum

Front

White paint
mark

B  : Black
R  : Red
W : White
Y  : Yellow

No. 1 turbocharger
wastgate solenoid

Evaporative emission
ventilation solenoid

Fuel tank

No. 2 turbocharger
wastgate solenoid

Air cleaner

Check
valve

Rocker cover

Turbocharger
bypass valve

Fuel
pressure
regulator

Turbocharger

Turbochager
wastgate actuator

White paint
mark

AB

Evaporative emission
purge solenoid

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-71

VACUUM CIRCUIT DIAGRAM

M1173007100995

AK704214AB

Evaporative 
emission 
purge 
solenoid
(on: open)

Check valve

Fuel pressure
regulator

Turbocharger 
bypass valve

B

B

B

B

B

B

B

B: BLACK
R: RED
W: WHITE
Y: YELLOW

Intake manifold

From
air
cleaner

To
combustion
chamber

Throttle body

Evaporative emission 
ventilation solenoid 
(ON: Close)

White
paint mark

Evaporative emission canister

Turbochager

Turbochager
wastegate
actuator

No. 2 turbochager
wastegate solenoid

No. 1 turbochager
wastegate solenoid

Air cleaner

Fuel tank

B

B

B

B

W

W

Y

R

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-72

VACUUM HOSE INSTALLATION

M1173007200486

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

M1173007300621

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)

M1173005001199

The positive crankcase ventilation (PCV) system pre-
vents the escape of blow-by gases from inside the 
crankcase into the atmosphere.
Fresh air is sent from the air cleaner into the crank-
case 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 accord-
ing 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 dur-
ing low load engine operation to maintain engine sta-
bility, while the flow is increased during high load 
operation to improve the ventilation performance.

SYSTEM DIAGRAM

AK703398 AD

Air cleaner

Positive crankcase
ventilation valve

Ventilation hose

Breather hose