Mitsubishi Montero (2002-2004). Manual — part 848
EMISSION CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-55
EMISSION CONTROL
GENERAL DESCRIPTION
M1173000100228
The emission control system consists of the fol-
lowing subsystems:
• Positive crankcase ventilation system
• Evaporative emission system
• Exhaust emission control system
DIAGNOSIS
M1173000700026
SPECIAL TOOLS
M1173000600029
SYMPTOM
PROBABLE CAUSE
REMEDY
Engine will not start or hard
to start
Vacuum hose disconnected or damaged Repair or replace
The EGR valve is not closed.
Repair or replace
Malfunction of the evaporative emission
purge solenoid
Repair or replace
Rough idle or engine stalls
The EGR valve is not closed.
Repair or replace
Vacuum hose disconnected or damaged. Repair or replace
Malfunction of the positive crankcase
ventilation valve
Replace
Malfunction of the purge control system
Check the system; If there is a
problem, check its component
parts.
Engine hesitates or poor
acceleration
Malfunction of the exhaust gas
recirculation system
Check the system; If there is a
problem, check its component
parts.
Excessive oil consumption
Positive crankcase ventilation line
clogged
Check positive crankcase
ventilation system
Poor fuel mileage
Malfunction of the exhaust gas
recirculation system
Check the system; If there is a
problem, check its component
parts.
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MD998770
Oxygen sensor wrench
MD998770-01 or General
service tool
Removal/installation of
heated oxygen sensor
MB995061
Purge flow indicator
MLR6890A
Inspection of purge
control system
EMISSION CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-56
VACUUM HOSES
VACUUM HOSE ROUTING
M1173000900246
AK200798
EVAPORATIVE
EMISSION
CANISTER
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
FUEL
TANK
EVAPORATIVE
EMISSON PURGE
SOLENOID
THROTTLE BODY
VACUUM
ACTUATOR
VACUUM
TANK
INTAKE
MANIFOLD
TUNING
SOLENOID
FRONT
FUEL PRESSURE
REGULATOR
B: BLACK
*1: WHITE PAINT MARK
*1
B
B
B
B
B
B
B
AB
EMISSION CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-57
VACUUM CIRCUIT DIAGRAM
M1173007100166
VACUUM HOSE INSTALLATION
M1173007200011
1. When connecting the vacuum hoses, they should be
securely inserted onto the nipples.
2. Connect the hoses correctly, using the VACUUM HOSE
ROUTING as a guide.
AK200799
B
B
L
B
B: BLACK
THROTTLE BODY
INTAKE MANIFOLD
FROM AIR
CLEANER
FUEL
PRESSURE
REGULATOR
TO COMBUSTION
CHAMBER
EVAP
PURGE
SOLENOID
(ON: OPEN)
FUEL
TANK
EVAPORATIVE EMISSION
VENTILATION SOLENOID
(ON: CLOSE)
EVAPORATIVE
EMISSION
CANISTER
AB
EMISSION CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-58
VACUUM HOSE CHECK
M1173007300018
1. Using the VACUUM HOSE ROUTING as a guide, check that
the vacuum hoses are correctly connected.
2. Check the connection of the vacuum hoses, (removed,
loose, etc.) and check that there are no sharp bends or
damage.
POSITIVE CRANKCASE VENTILATION SYSTEM
GENERAL DESCRIPTION (POSITIVE CRANKCASE VENTILATION SYSTEM)
M1173005000174
The positive crankcase ventilation system is a sys-
tem for preventing the escape of blow-by gases from
inside the crankcase into the atmosphere.
Fresh air is sent from the 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 positive crankcase
ventilation (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
COMPONENT LOCATION
M1173007400112
AK200800
BREATHER HOSE
VENTILATION HOSE
PCV VALVE
AB
AK200800
AK200801
POSITIVE CRANKCASE VENTILATION
(PCV) VALVE
AB
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