Mitsubishi Lancer. Manual — part 216
Battery voltage
Normal condition
Applied
Vacuum leaks
Not applied
Vacuum maintained
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-12
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
Pre-removal and Post-installation Operation
Air Cleaner Assembly Removal and Installation (Refer to
GROUP 15
).
AC208253
1
2
3
4
5
6
7
8
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 hose
5.
Fuel vapour control line clamp
6.
Fuel vapour canister
7.
Fuel high-pressure hose clamp
8.
Fuel vapour canister bracket
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 tempera-
ture, 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 recircu-
late exhaust gases under one of the following condi-
tions.
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.
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-13
SYSTEM DIAGRAM
AK300775
Manifold absolute
pressure (MAP) sensor
Engine-ECU <M/T>,
Engine-A/T-ECU <A/T>
Engine coolant
temperature sensor
Crank angle sensor
EGR
control
solenoid
valve
EGR valve
OFF
ON
Control
relay
Battery
AB
<4G1>
AK302349 AB
<4G6>
EGR
control
Solenoid
valve
EGR valve
OFF
ON
Control
relay
Battery
Engine-ECU
Barometric pressure
sensor
Air flow sensor
Engine coolant
temperature sensor
Crank angle sensor
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-14
COMPONENT LOCATION (EGR SYSTEM)
M1173007600224
AK300776
<4G1>
AB
EGR control
solenoid valve
AK300778
<4G6>
AB
EGR control
solenoid valve
AK300777
<4G1>
AB
EGR valve
AK300779AB
<4G6>
EGR valve
EMISSION CONTROL <MPI>
ENGINE AND EMISSION CONTROL
17-15
EGR SYSTEM CHECK
M1173002600348
AK300780 AB
<4G1>
EGR valve
Green stripe
Three-way
terminal
AK300781AB
<4G6>
EGR valve
Green stripe
Three-way
terminal
1. Disconnect the vacuum hose (Green stripe) from
the EGR valve, and then connect a hand vacuum
pump via the three-way terminal.
2. When the engine is hot or cold, check the
condition of vacuum by racing the engine.
When engine is cold
(Engine coolant temperature: 20
° C or less)
Throttle valve
Normal vacuum condition
Open quickly
No vacuum will generate (the
same as barometric pressure.)
When engine is hot
(Engine coolant temperature: 80
° C or higher)
Throttle valve
Normal vacuum condition
Open quickly
It will momentarily rise over 13
kPa
3. Disconnect the three-way terminal.
AK300782 AB
<4G1>
EGR valve
Green stripe
AK300783AB
<4G6>
EGR valve
Green stripe
4. Connect the hand vacuum pump to the EGR
valve nipple.
5. Check whether the engine stalls or the idling is
unstable when a vacuum of 30 kPa or higher is
applied during idling.
EGR VALVE CHECK
M1173002800223
1. Remove the EGR valve and inspect for sticking,
carbon deposits, etc. If found, clean with a
suitable solvent so that the valve seats correctly.
2. Connect a hand vacuum pump to the EGR valve.
3. Apply 67 kPa of vacuum, and check that the
vacuum is maintained.
AKX00348
4. Apply a vacuum and check the passage of air by
blowing through one side of the EGR passage.
Vacuum
Passage of air
5.3 kPa or less
Air is not blown out
27 kPa or more
Air is blown out
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