Mitsubishi Montero Sport (2004+). Manual — part 129
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-111
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
GENERAL DESCRIPTION (EXHAUST GAS RECIRCULATION SYSTEM)
M1173005200338
The exhaust gas recirculation (EGR) system lowers
the nitrogen oxides (NOx) emission level. When the
air/fuel mixture combustion temperature is high, a
large quantity of NOx is generated in the combustion
chamber. Therefore, this system recirculates part of
exhaust 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
When the engine coolant temperature is low, when
the engine is at idle or when a wide open throttle
operation is performed, the EGR valve is kept
closed, achieving no EGR. After warming up of the
engine, the EGR valve can be opened by the power-
train control module (PCM).
The PCM monitors the EGR system and illuminates
the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) to indicate that there
is a malfunction.
SYSTEM DIAGRAM
AKX00353
VACUUM CONTROL VALVE
ON
OFF
MFI RELAY
BATTERY
PCM
VOLUME AIRFLOW
SENSOR
ENGINE COOLANT
TEMPERATURE SENSOR
CRANKSHAFT POSITION
SENSOR
EGR VALVE
AE
EGR VACUUM REGULATOR
SOLENOID VALVE
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-112
COMPONENT LOCATION
M1173007600235
EXHAUST GAS RECIRCULATION SYSTEM
CHECK
M1173002600359
1. Disconnect the vacuum hose (green stripe or black) from the
EGR valve, and then connect a hand vacuum pump via the
tee-fitting terminal.
2. Start the engine. As described in the chart below, check the
vacuum condition when the throttle valve is opened
suddenly (revving) during cold and hot engine conditions. If
the engine is hot and the vacuum dose not rise over 13 kPa
(3.9 in Hg), perform the vacuum control valve check and
EGR port vacuum check. Then continue to Step 3. If
vacuum rises momentarily, proceed to Step 3.
When engine is cold [Engine coolant temperature: 20
°C
(68
°F) or less]
When engine is hot [Engine coolant temperature: 80
°C
(176
°F) or less]
AK303328AB
EGR VACUUM REGULATOR SOLENOID
VALVE
AKX00344
EGR VALVE
AB
THROTTLE VALVE
NORMAL VACUUM
CONDITION
Open quickly
No vacuum (Remained as
barometric pressure).
THROTTLE VALVE
NORMAL VACUUM
CONDITION
Open quickly
Momentarily rise over 13 kPa
(3.9 in Hg)
AKX00345
EGR VALVE
BLACK
TEE-
FITTING
AB
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-113
3. Stop the engine. Remove the tee-fitting and the hand
vacuum pump.
4. Connect the hand vacuum pump directly to the EGR valve.
5. Start the engine and run at idle until warm.
6. The engine idling speed should be rough when a vacuum of
29 kPa (8.7 in Hg) or more is applied to the EGR valve.
7. If engine idles rough, EGR passage is open and the system
is OK. If engine idle is not rough, the EGR passage and the
valve must be checked for restrictions. Perform the EGR
valve check. Then repeat the exhaust gas recirculation
system check.
VACUUM CONTROL VALVE CHECK
M1173002700163
1. Disconnect the vacuum hose (white stripe) from the vacuum
control valve and connect the hand vacuum pump to the
vacuum control valve
2. Plug the end of the removed vacuum hose.
3. Start the engine and run at idle.
4. As described in the chart below,check the vacuum condition.
EGR VALVE CHECK
M1173002800171
1. Removal 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 (20 in Hg) of vacuum, and check to be sure
that the vacuum is maintained.
4. As described in the chart below, apply a vacuum and check
the passage of air by blowing through one side of the EGR
passage.
NOTE: Passage of air should be checked by blowing the
valve port.
5. Reinstall the EGR valve, using a new gasket, and tighten to
the specified torque.
Tightening torque: 22
± 4 N⋅m (16 ± 3 ft-lb)
AKX00346
EGR VALVE
BLACK
PLUG
AB
ENGINE CONDITION
NORMAL VACUUM
CONDITION
Idling
Approximately 21.3
− 24.0
kPa (6.3
− 7.1 in Hg)
AKX00347
PLUG
WHITE
STRIPE
AB
VACUUM
PASSAGE OF AIR
5.3 kPa (1.6 in Hg) or less
Air is not blown out
29 kPa (8.7 in Hg) or more
Air is blown out
AKX00348
EMISSION CONTROL
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ENGINE AND EMISSION CONTROL
17-114
EGR PORT VACUUM CHECK
M1173002900093
1. Disconnect the vacuum hose (green stripe) from the throttle
body EGR vacuum nipple and connect a hand vacuum
pump to the nipple.
2. Start the engine.
3. Measure engine vacuum at idle.
Standard value: 51 kPa (15 in Hg) or more
4. Reset the vacuum pump to "0" (Release vacuum).
5. Using a stop watch, measure how long it takes for the
vacuum gauge to reach 51 kPa (15 in Hg).
Standard value: 1.0 second or less
6. If it takes more than 1.0 second for the gauge to reach 51
kPa (15 in Hg), the EGR may be restricted and should be
cleaned.
EGR VACUUM REGULATOR SOLENOID VALVE
CHECK
M1173003100250
1. Disconnect the vacuum hose (black, yellow stripe) from the
EGR vacuum regulator solenoid valve.
NOTE: When disconnecting the vacuum hose, always make
sure that it can be reconnected at its original position.
2. Disconnect the harness connector.
3. Connect a hand vacuum pump to the nipple (A) of the EGR
vacuum regulator solenoid valve. (Refer to the illustration at
left.)
4. As described in the chart below, check airtightness by
applying a vacuum with voltage applied directly from the
battery to the EGR vacuum regulator solenoid valve and
without applying voltage.
AKX00349 AB
EGR PORT
VACUUM NIPPLE
AKX00350
1.0 SECOND
VACUUM
RESET
TIME
AB
BATTERY POSITIVE
VOLTAGE
NORMAL CONDITION
Not applied
Vacuum leaks
Applied
Vacuum maintained
AKX00351
A
B
AB
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