Mitsubishi Evolution X. Manual — part 225
EMISSION CONTROL <MFI - T/C>
TSB Revision
ENGINE AND EMISSION CONTROL
17-69
AUTO-CRUISE CONTROL SWITCH
REMOVAL AND INSTALLATION
M1172007600072
Refer to GROUP 37, Steering Wheel
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>
TSB Revision
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>
TSB Revision
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>
TSB Revision
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
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