2005 MITSUBISHI LANCER engine

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-7
VACUUM CIRCUIT DIAGRAMM1173007100263
AK300765
From
air
cleaner To
combustion
chamberThrottle body
B R
AB
Intake manifold
Y G
G
GR L
Fuel
pressure
regulator
EGR
valveEGR
control
solenoid
valvePurge
control
solenoid
valveCanister
Vacuum hose colour
B: Black
G: Green
R: Red
Y: Yellow
L: Blue
<4G1>
AK300766
From
air
cleaner To
combustion
chamberThrottle body
B B
AB
Intake manifold
Y R
GW L
Fuel
pressure
regulator
EGR
valveEGR
control
solenoid
valve
Purge
control
solenoid
valveCanister
Vacuum hose colour
B: Black
G: Green
R: Red
W: White
Y: Yellow
L: Blue
<4G6>
B

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-8
VACUUM HOSE CHECKM1173007300159
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 INSTALLATIONM1173007200107
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.
CRANKCASE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173005000237
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
AK204365
Air cleaner
Air
Ventilation hose
Breather hose
PCV valve
AB

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-9
COMPONENT LOCATION (CRANKCASE
EMISSION CONTROL SYSTEM)
M1173007400208
POSITIVE CRANKCASE VENTILATION
SYSTEM CHECK
M1173001100179
1. Remove the ventilation hose from the PCV valve.
2. Remove the PCV valve from the rocker cover.
3. Reinstall the PCV valve at the ventilation hose.
4. Start the engine and run at idle.
5. Place a finger at the opening of the PCV valve
and check that vacuum of the intake manifold is
felt.
NOTE: At this moment, the plunger in the PCV
valve moves back and forth.
6. If vacuum is not felt, clean the PCV valve or
replace it.
POSITIVE CRANKCASE VENTILATION
(PCV) VALVE CHECK
M1173001200187
1. Insert a thin rod into the PCV valve from the side
shown in the illustration (rocker cover installation
side), and move the rod back and forth to check
that the plunger moves.
2. If the plunger does not move, there is a clogging
in the PCV valve. In this case, clean or replace
the PCV valve.
EVAPORATIVE EMISSION CONTROL
SYSTEM
GENERAL INFORMATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)
M1173005100405
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.
AK300767
<4G1>
AB
PCV valve
AK204366
<4G6>
AC
PCV valve
AKX00336
PCV valve
AD
AK100010
PCV valve
AC

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-10
SYSTEM DIAGRAM
COMPONENT LOCATION (EVAPORATIVE
EMISSION CONTROL SYSTEM)
M1173007500216
PURGE CONTROL SYSTEM CHECKM1173001400299
AK204367AC
Throttle body
Canister
From
fuel
tank
OFF
ONPurge
control
solenoid
valveControl
relay
BatteryEngine-ECU <4G1-M/T, 4G6>,
Engine-A/T-ECU <4G1-A/T>
Air flow sensor <4G6>
Engine coolant
temperature sensor
Intake air
temperature sensor
Barometric pressure
sensor <4G6> Manifold absolute pressure
(MAP) sensor <4G1>
AK300769
<4G1>
AB
Purge control
solenoid valve
AK300770
<4G6>
AB
Purge control
solenoid valve
AK300771
<4G1>
AB
Plug
Vacuum hose
AK300772
<4G6>
AB
Plug
Vacuum hose

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-11
1. Disconnect the vacuum hose (red stripe) from
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)
When engine is hot
(Engine coolant temperature: 80°C or higher)
PURGE PORT VACUUM CHECKM1173001500177
1. Disconnect the vacuum hose (red stripe) from the
throttle body and connect a hand vacuum pump to
the nipple.
2. Plug the vacuum hose (red stripe).3. Start the engine.
4. Check that a fairly constant negative pressure is
generated regardless of the engine speed.
5. If no negative pressure is generated, the port is
probably blocked and should be cleaned.
PURGE CONTROL SOLENOID VALVE
CHECK
M1173001700193
NOTE: When disconnecting the vacuum hose,
always make a mark so that it can be reconnected at
original position.
1. Disconnect the vacuum hose 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). Engine condition Normal condition
At idle Vacuum is maintained.
3,000 r/min
Engine condition Normal condition
At idle Vacuum is maintained.
3,000 r/min (within 3
minutes after engine
starts)Vacuum will leak.
AK300773
<4G1>
AB
Plug
Vacuum hose
AK300774
<4G6>
AB
Plug
Vacuum hose
AK100011AC
Vac-
uum
Engine speed (r/min)
AK100012AC
Battery A
AK100013

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-12
4. Check airtightness by applying a vacuum with
voltage applied directly from the battery to the
purge control solenoid valve and without applying
voltage.
5. Measure the resistance between the terminals of
the solenoid valve.
Standard value: 30 − 34 Ω (at 20°C)
FUEL VAPOUR CANISTER REMOVAL
AND INSTALLATION
M1173004200153
Battery voltage Normal condition
Applied Vacuum leaks
Not applied Vacuum maintained
Pre-removal and Post-installation Operation
Air Cleaner Assembly Removal and Installation (Refer to
GROUP 15 P.15-3).
AC208253
1 2 3
4
56
78
AD
Removal steps
1. Emission vacuum hose connection
2. Fuel vapour control line hose
3. Fuel vapour control check valve
4. Fuel vapour control line hose5. Fuel vapour control line clamp
6. Fuel vapour canister
7. Fuel high-pressure hose clamp
8. Fuel vapour canister bracketRemoval steps (Continued)

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-13
EXHAUST GAS RECIRCULATION
(EGR) SYSTEM
GENERAL INFORMATION (EGR SYSTEM)M1173005200327
The exhaust gas recirculation (EGR) system lowers
the nitrogen oxide (NOx) emission level.
When the air/fuel mixture combustion temperature is
high, a large quantity of nitrogen oxides (NOx) is
generated in the combustion chamber.
Therefore, this system recirculates part of emission
gas from the exhaust port of the cylinder head to the
combustion chamber through the intake manifold to
decrease the air/fuel mixture combustion
temperature, resulting in reduction of NOx.The EGR flow rate is controlled by the EGR valve so
as not to decrease the driveability.
OPERATION
The EGR valve is being closed and does not
recirculate exhaust gases under one of the following
conditions.
Otherwise, the EGR valve is opened and recirculates
exhaust gases.
•The engine coolant temperature is low.
•The engine is at idle.
•The throttle valve is widely opened.
SYSTEM DIAGRAM
AK300775
Manifold absolute
pressure (MAP) sensor Engine-ECU ,
Engine-A/T-ECU
Engine coolant
temperature sensor
Crank angle sensor EGR
control
solenoid
valve
EGR valveOFF
ON
Control
relay
Battery
AB
<4G1>

EMISSION CONTROL
ENGINE AND EMISSION CONTROL17-14
COMPONENT LOCATION (EGR SYSTEM)M1173007600224
AK302349AB
<4G6>
EGR
control
Solenoid
valve
EGR valveOFF
ON
Control
relay
BatteryEngine-ECU
Barometric pressure
sensor
Air flow sensor
Engine coolant
temperature sensor
Crank angle sensor
AK300776
<4G1>
AB
EGR control
solenoid valve
AK300778
<4G6>
AB
EGR control
solenoid valve
AK300777
<4G1>
AB
EGR valve
AK300779AB
<4G6>
EGR valve