Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 392

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-87

<3.0L ENGINE>

VACUUM HOSE INSTALLATION

M1173007200022

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.

AKX01296

INTAKE MANIFOLD

THROTTLE BODY

TO COMB-
USTION
CHAMBER

FROM AIR
CLEANER

HOSE JOINT

EGR SOLENOID
(ON: CLOSE)

FUEL
PRESSURE
REGULATOR

EVAPORATIVE
EMISSION
PURGE
SOLENOID
(ON: OPEN)

CHAMBER

VACUUM
CONTROL
VALVE

EGR VALVE

FUEL
TANK

B: BLACK
G: GREEN
L: LIGHT BLUE
W: WHITE
Y: YELLOW
*1:RED PAINT MARK
*2:RESTRICTOR

EVAPORATIVE
EMISSION
CANISTER

EVAPORATIVE EMISSION
VENTILATION SOLENOID
(ON: CLOSE)

AB

B

B

B

B

B

B

B

B

B

B

L

G

G

G

Y

Y

W

*1

*1

*2

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-88

VACUUM HOSE CHECK

M1173007300029

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 confirm that there are no sharp bends or
damage.

POSITIVE CRANKCASE VENTILATION SYSTEM

GENERAL DESCRIPTION (POSITIVE CRANKCASE VENTILATION SYSTEM)

M1173005000044

The positive crankcase ventilation system is a
system for preventing the escape of blow-by gases
from inside the crankcase into the atmosphere.
Fresh air is sent from the air 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
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

<2.4L ENGINE>

AKX01297

VENTILATION HOSE

POSITIVE CRANKCASE
VENTILATION (PCV)
VALVE

BREATHER HOSE

AB

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-89

<3.0L ENGINE>

COMPONENT LOCATION

M1173007400026

AKX00334

BREATHER HOSE

VENTILATION HOSE

PCV VALVE

AB

AKX01299 AB

POSITIVE CRANKCASE VENTILATION
(PCV) VALVE
<2.4L ENGINE>

AKX01300AB

POSITIVE CRANKCASE VENTILATION
(PCV) VALVE
<3.0L ENGINE>

EMISSION CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-90

CRANKCASE VENTILATION SYSTEM CHECK

M1173001100049

1. Remove the positive crankcase ventilation (PCV) valve from

the rocker cover, then reconnect the PCV valve to the
vacuum supply hose.

2. With the engine idling, put your finger on the open end of the

PCV valve, and check for negative pressure (vacuum).

NOTE: At this time, the plunger in the PCV valve should
move back and forth as the open end is covered and
uncovered.

3. If negative pressure is not felt, clean or replace the PCV

valve. Inspect he vacuum supply hose and vacuum supply
hose port for restriction or plugged condition.

POSITIVE CRANKCASE VENTILATION (PCV)
VALVE CHECK

M1173001200046

1. Hold the PCV valve with the vacuum side down. Insert a thin

rod, and using light pressure, depress the end of the PCV
valve spring by 5

−

10 mm (0.2

−

0.3 inch). Release

pressure on the rod to see if the PCV valve spring will lift the
rod to its original position.

2. If the rod returns quickly to its original position, the PCV

valve is OK. If the stick does not return quickly. clean or
replace the PCV valve.

EVAPORATIVE EMISSION CONTROL SYSTEM

GENERAL DESCRIPTION

M1173005100041

The evaporative emission control system prevents
fuel vapors generated in the fuel tank from escaping
into the atmosphere.
Fuel vapors from the fuel tank flow through the vapor
pipe/hose to be stored temporarily in the evaporative
emission (EVAP) canister.
When the vehicle is in operation, fuel vapors stored
in the EVAP canister flow through the chamber, the
EVAP purge solenoid, purge port and intake manifold
plenum 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 module brings
the EVAP purge solenoid into the OFF state to shut
off the fuel vapor flow to the intake manifold plenum.
This ensures driveability when the engine is cold or
running under low load and also stabilizes the
emission level.

An EVAP ventilation solenoid is provided between
the EVAP canister and atmosphere to monitor for
OBD-II EVAP leaks. This solenoid is normally OFF.
However, it turns ON when monitoring the OBD-II
EVAP leaks and shuts off the atmosphere flow to the
EVAP canister. Then the fuel tank differential
pressure sensor monitors the fuel vapor pressure to
detect OBD-II EVAP leaks. The fuel vent valve and
the leveling valve prevent fuel from being overfilled.
The fuel vent valve and the leveling valve prevents
fuel leaks just if the vehicle is rolled over in an
accident.
The vent valve releases the air from the fuel tank
through the evaporative emission canister into the
atmosphere when the fuel tank pressure increases
due to refueling, etc. The vent valve and the air filter
supply the atmospheric air to the evaporative
emission canister when the fuel tank pressure
decreases.

AKX00336

PCV VALVE

AB

AKX00337

5 - 10 mm
(0.2 - 0.3 in)

PCV VALVE

VACUUM SIDE

THIN ROD
(VERY
SMOOTH)

AB