Mitsubishi Pajero Pinin. Manual - part 165

ENGINE AND EMISSION CONTROL – 

Emission Control System <MPI>

PCV valve

17-7

CRANKCASE EMISSION CONTROL SYSTEM

SYSTEM DIAGRAM

Ventilation hose

Breather hose

PCV valve

COMPONENT LOCATION

ENGINE AND EMISSION CONTROL – 

Emission Control System <MPI>

Purge control solenoid valve

17-8

EVAPORATIVE EMISSION CONTROL SYSTEM

GENERAL INFORMATION

The evaporative emission control system prevents
fuel vapours generated in the fuel tank from escaping
into the atmosphere.
Fuel vapours from the fuel tank flow through the
fuel tank pressure control valve and vapour
pipe/hose to be stored temporarily in the canister.
When driving the vehicle, fuel vapours stored in
the canister flow through the purge solenoid and
purge port and go into the intake manifold to be

sent to the combustion chamber.
When the engine coolant temperature is low or when
the intake air quantity is small (when the engine
is at idle, for example), the engine control unit turns
the purge solenoid off to shut off the fuel vapour
flow to the intake manifold.
This does not only insure the driveability when the
engine is cold or running under low load but also
stabilize the emission level.

SYSTEM DIAGRAM

From fuel tank

Canister

Purge control 
solenoid valve

OFF

ON

Air flow sensor

Barometric pressure
sensor

Control
relay

Throttle body

Engine-ECU

Engine coolant
temperature sensor

Intake air 
temperature sensor

COMPONENT LOCATION

ENGINE AND EMISSION CONTROL – 

Emission Control System <MPI>

17-9

PURGE CONTROL SYSTEM CHECK

1.

Disconnect the vacuum hose (red stripe) from the throttle
body and connect it to a hand vacuum pump.

2.

Plug the nipple from which the vacuum hose was removed.

3.

When the engine is cold or hot, apply a vacuum of 53
kPa, and check the condition of the vacuum.

When engine is cold
(Engine coolant temperature: 40

_

C or less)

Engine condition

Normal condition

At idle

Vacuum is maintained

3,000 r/min

When engine is hot
(Engine coolant temperature: 80

_

C or higher)

Engine condition

Normal condition

At idle

Vacuum is maintained

3,000 r/min (fore
approximately 3 minutes
after the engine is started.)

Vacuum will leak.

PURGE PORT VACUUM CHECK

1.

Disconnect the vacuum hose (red stripe) from the throttle
body purge vacuum nipple and connect a hand vacuum
pump to the nipple.

2.

Start the engine and check that the vacuum remains fairly
constant after racing the engine.

NOTE
If vacuum changes, it is possible that the throttle body
purge port may be clogged and require cleaning.

Plug

Purge port 
vacuum nipple

Vacuum

Engine speed (r/min)

ENGINE AND EMISSION CONTROL – 

Emission Control System <MPI>

17-10

PURGE CONTROL SOLENOID VALVE CHECK

NOTE
When disconnecting the vacuum hose, always make a mark
so that it can be reconnected at original position.
1.

Disconnect the vacuum hose (black, red stripe) from the
solenoid valve.

2.

Disconnect the harness connector.

3.

Connect a hand vacuum pump to nipple (A) of the solenoid
valve (refer to the illustration at left).

4.

Check airtightness by applying a vacuum with voltage
applied directly from the battery to the purge control
solenoid valve and without applying voltage.

Battery voltage

Normal condition

Applied

Vacuum leaks

Not applied

Vacuum maintained

5.

Measure the resistance between the terminals of the
solenoid valve.

Standard value: 36 – 44 

Ω

 (at 20

_

C)

Battery

B

A