Mitsubishi Pajero Pinin. Manual — part 159
ENGINE AND EMISSION CONTROL –
Emission Control System
17-5
EMISSION CONTROL SYSTEM
GENERAL INFORMATION
The emission control system consists of the following subsystems:
D
Crankcase emission control system
D
Evaporative emission control system
D
Exhaust emission control system
Items
Name
Specification
Crankcase emission
control system
Positive crankcase ventilation (PCV) valve
Variable flow type
(Purpose: HC reduction)
Evaporative emission
control system
Canister
Purge control solenoid valve
Equipped
Duty cycle type solenoid valve
(Purpose: HC reduction)
Exhaust emission
control system
Air-fuel ratio control device–GDI system
Oxygen sensor feedback type
(Purpose: CO, HC, NOx reduction)
Exhaust gas recirculation system
D
EGR valve
Equipped
Stepper motor type
(Purpose: NOx reduction)
Catalytic converter
Monolith type
(Purpose: CO, HC, NOx reduction)
EMISSION CONTROL DEVICE REFERENCE TABLE
Related parts
Crankcase
emission
control
system
Evaporative
emission
control
system
Air/fuel
ratio
control
system
Catalytic
converter
Exhaust gas
recircula-
tion
system
Reference
page
PCV valve
×
17-9
Purge control solenoid valve
×
17-12
GDI system component
×
×
GROUP 13A
Catalytic converter
×
17-17
EGR valve
×
17-14
ENGINE AND EMISSION CONTROL –
Emission Control System
17-6
SERVICE SPECIFICATIONS
Items
Standard value
Purge control solenoid valve coil resistance (at 20
_
C)
Ω
36 – 44
EGR valve (stepper motor) coil resistance (at 20
_
C)
Ω
10 – 20
SPECIAL TOOL
Tool
Number
Name
Use
MB991658
Test harness set
Inspection of EGR valve
VACUUM HOSE
VACUUM HOSE PIPING DIAGRAM
PCV
valve
From fuel pump (low-pressure)
Canister
Purge control
solenoid valve
Oxygen sensor
Fuel pressure
regulator (high-
pressure)
To fuel tank
EGR valve
(stepper
motor)
P
Catalytic converter
Fuel pump (high-
pressure)
Injector
Air cleaner
Air
ENGINE AND EMISSION CONTROL –
Emission Control System
17-7
VACUUM CIRCUIT DIAGRAM
To
combustion
chamber
Intake manifold
Throttle body
From air
cleaner
Vacuum hose colour
B: Black
R: Red
Purge control
solenoid valve
(ON: OPEN)
Canister
VACUUM HOSE CHECK
1.
Using the piping diagram as a guide, check to be sure
that the vacuum hoses are correctly connected.
2.
Check the connection condition of the vacuum hoses,
(removed, loose, etc.) and check to be sure that there
are no bends or damage.
VACUUM HOSE INSTALLATION
1.
When connecting the vacuum hoses, they should be
securely inserted onto the nipples.
2.
Connect the hoses correctly, using the vacuum hose piping
diagram as a guide.
ENGINE AND EMISSION CONTROL –
Emission Control System
PCV valve
PCV valve
17-8
CRANKCASE EMISSION CONTROL SYSTEM
GENERAL INFORMATION
The crankcase emission control system prevents
blow-by gases from escaping inside the crankcase
into the atmosphere.
Fresh air is sent from the air cleaner into the
crankcase through the breather hose. The air
becomes mixed with the blow-by gases 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 lifts the plunger according 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 during low load engine
operation to maintain engine stability, while the flow
is increased during high load operation to improve
the ventilation performance.
SYSTEM DIAGRAM
PCV
valve
Ventilation hose
Breather hose
COMPONENT LOCATION
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