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