Mitsubishi Eclipse. Manual — part 705
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-101
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)
M1173005000260
The positive crankcase ventilation (PCV) 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 crank-
case 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 PCV valve.
The PCV valve is designed to lift the plunger accord-
ing 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 dur-
ing low load engine operation to maintain engine sta-
bility, 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 VALVE
BREATHER HOSE
AC
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-102
<3.0L ENGINE>
COMPONENT LOCATION
M1173007400167
POSITIVE CRANKCASE VENTILATION SYSTEM
CHECK
M1173001100180
1. Remove the positive crankcase ventilation (PCV) valve from
the rocker cover, then reconnect the PCV valve to the
vacuum supply hose.
AKX00334
BREATHER HOSE
VENTILATION HOSE
POSITIVE
CRANKCASE
VENTILATION
VALVE
AC
AK101366AD
POSITIVE CRANKCASE VENTILATION VALVE
< 2.4L ENGINE >
AK300571 AB
POSITIVE CRANKCASE VENTILATION VALVE
<3.0L ENGINE>
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-103
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 uncov-
ered.
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 VALVE
CHECK
M1173001200198
1. Hold the positive crankcase ventilation (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 (EVAPORATIVE EMISSION SYSTEM)
M1173005100331
The evaporative emission (EVAP) 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 EVAP can-
ister.
When the vehicle is in operation, fuel vapors stored
in the EVAP canister flow through 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 (ECM)
or powertrain control module (PCM) 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 run-
ning 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 pres-
sure sensor monitors the fuel vapor pressure to
detect OBD-II EVAP leaks. The fuel overflow limiter
valve and the leveling valve prevent fuel from being
overfilled. The fuel overflow limiter valve and the lev-
eling valve prevents fuel leaks just if the vehicle is
rolled over in an accident.
The EVAP ventilation valve releases the air from the
fuel tank through the EVAP canister into the atmo-
sphere when the fuel tank pressure increases due to
refueling, etc. The EVAP ventilation valve and the air
filter supply the atmospheric air to the EVAP canister
when the fuel tank pressure decreases.
AK203692
POSITIVE CRANKCASE
VENTILATION VALVE
AC
AK301831
5 – 10 mm
(0.2 – 0.3 in)
THIN ROD
(VERY SMOOTH)
POSITIVE
CRANKCASE
VENTILATION
VALVE
VACUUM SIDE
AB
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-104
SYSTEM DIAGRAM
<2.4L ENGINE>
AK300572
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
LIQUID SEPARATOR
EVAPORATIVE
EMISSION
PURGE
SOLENOID
ON: OPEN
ECM <M/T>
PCM <A/T>
INTAKE AIR TEMPERATURE
SENSOR
ENGINE COOLANT
TEMPERATURE SENSOR
VOLUME AIRFLOW SENSOR
MFI RELAY
AIR FILTER
EVAPORATIVE EMISSION
VENTILATION SOLENOID
ON: CLOSED
AB
BAROMETRIC PRESSURE
SENSOR
FUEL CUT
OFF VALVE
EVAPORATIVE
EMISSION
CANISTER
FUEL
TANK
FUEL OVERFLOW
LIMITER VALVE
LEVELING VALVE
EVAPORATIVE EMISSION
VENTILATION VALVE
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