Mitsubishi Outlander (2013+). Manual - part 147

EMISSION CONTROL<MPI>

ENGINE AND EMISSION CONTROL

17-14

EMISSION CONTROL<MPI>

GENERAL INFORMATION

M2171000101756

The emission control is basically the same as the 
4B1 engine mounted on the ASX.

SYSTEM CONFIGURATION DIAGRAM

Exhaust gas cleaning devices list

AKB00864

Purge control 
solenoid valve

Canister

Air

From 
fuel pump

Positive
crankcase
ventilation
valve

Oxygen sensor (front)

Oxygen sensor (rear)

Catalytic 
converter

AB

Air cleaner

Catalytic 
converter

System

Objective / Function

Composition parts

Crankcase ventilation system

HC decrease
Re-combustion of blow-by 
gas.

Positive crankcase ventilation 
(PCV) valve

Evaporative emission control system

HC decrease
Re-combustion of blow-by 
gas.

• Canister

• Purge control solenoid valve

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EMISSION CONTROL<MPI>

ENGINE AND EMISSION CONTROL

17-15

CRANKCASE VENTILATION SYSTEM

M2171000400583

A blow-by gas reduction device prevents blow-by 
gas from being expelled into the atmosphere and is 
of closed type. A positive crankcase ventilation 
(PCV) valve is provided in the ventilation hose from 
the rocker cover to the inlet manifold. During low load 

driving, clean air is supplied to the crankcase by the 
air intake hose via the breather hose and rocker 

Emission reduction 
systems

Air-fuel ratio 
feedback control

Decrease of CO, HC and 
NOx
Controls air-fuel ratio of 
air-fuel mixture to become 
theoretical air-fuel ratio 
(about 14.7), which is when 
the 3-way catalytic 
converter's cleaning 
performance is best. It also 
controls optimum fuel 
supply based on coolant 
temperature, driving 
conditions etc.

• Engine-ECU

• Air flow sensor

• Injector

• Oxygen sensor

• Crank angle sensor etc.

Catalytic 
converter

Decrease of CO, HC and 
NOx
It facilitates oxidation of CO 
and HC and reduction of 
NOx so that all 3 component 
gases are cleaned 
simultaneously.

Monolith catalyst

System

Objective / Function

Composition parts

AKB00825AB

Positive
crankcase
ventilation
valve    

Ventilation hose 

Breather hose

Air inlet

Flow of blow-by gas and clean air (low load area)

Flow of blow-by gas and clean air (high load area)

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EMISSION CONTROL<MPI>

ENGINE AND EMISSION CONTROL

17-16

cover, and it mixes with the blow-by gas in the crank-
case. The blow-by gas in the crankcase is induced to 
the inlet manifold through the rocker cover and PCV 
valve. During high load driving, blow-by gas in the 
crankcase is induced to the inlet manifold through 
the rocker cover and PCV valve and at the same 
time also via the air intake hose and throttle body 
due to negative pressure in the air cleaner.

POSITIVE CRANKCASE VENTILATION 
(PCV) VALVE

PCV valve lifts the plunger according to negative 
pressure at the inlet manifold to create appropriate 
ventilation for the crankcase.

EVAPORATIVE EMISSION CONTROL SYSTEM

M2171000200590

HC (hydrocarbon) generated in the fuel tank are 
adsorbed by the active carbon in the canister and 
stored. HC stored in the canister is introduced to the 
inlet manifold when engine is in operation where it is 
mixed with intake air and combusted. Engine-ECU 
introduces optimum HC amount according to driving 
conditions and so performs duty control on the purge 
control solenoid valve. Also, the purge control sole-
noid valve is closed during deceleration or immedi-
ately after engine start to restrict change in air-fuel 
ratio and prevent engine from stalling.

PURGE CONTROL SOLENOID VALVE

AK602324 AF

Plunger

From
rocker
cover

To inlet
manifold

Spring

AKB00826AB

Engine-ECU

Air flow sensor

Intake air temperature sensor

Manifold absolute
pressure sensor

Engine coolant
temperature sensor

Crank angle sensor

Throttle position sensor

Battery

Purge control
solenoid valve

Canister

AK602742AF

A

B

To canister

To inlet manifold

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EMISSION CONTROL<MPI>

ENGINE AND EMISSION CONTROL

17-17

A purge control solenoid valve is installed in the inlet 
manifold. The purge control solenoid valve controls 
the intake volume of fuel vapour gas from the canis-
ter. The purge control solenoid valve is a duty control 
type solenoid valve. When current is not passing 
through the coil, nipple A is kept airtight and fuel 
vapour gas cannot be sucked in. When current 

passes through the coil, air can pass between nipple 
A and B and fuel vapour gas is sucked in. 
Engine-ECU changes the ON duty ratio according to 
engine's operating condition to control the intake vol-
ume of fuel vapour gas.

EMISSION REDUCTION SYSTEMS

M2171000800439

These decrease CO, HC and NOx in the exhaust 
gases and consist of air-fuel ratio feedback control 
and catalytic converter.

1. AIR-FUEL RATIO FEEDBACK CON-
TROL

Refer to GROUP 13A 

− Fuel Injection Control 

P.13A-24

.

2. CATALYTIC CONVERTER

The exhaust manifold and the centre exhaust pipe 
include a catalytic converter.
Based on appropriate air-fuel ratio feedback from 
oxygen sensor, CO and HC are oxidized and NOx is 
reduced. Catalytic converter is a monolith with bee-
hive design with catalysts on the unit surface. It is 
protected by a thermally insulating mat and enclosed 
in a shell.

AK602245AC

12V

ON

OFF

0V

100 ms

Purge control
solenoid valve

From engine control relay

Engine-ECU

AKC00010

AKC00010

Catalytic converter 
(built-in to exhaust manifold)

AB

Front exhaust pipe

Catalytic converter 
(built-in to centre exhaust pipe)

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