Mitsubishi Montero Sport (2004+). Manual - part 129

 

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Mitsubishi Montero Sport (2004+). Manual - part 129

 

 

EMISSION CONTROL

TSB Revision

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

TSB Revision

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

°

(68

°F) or less]

When engine is hot [Engine coolant temperature: 80

°

(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

TSB Revision

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 Nm (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

TSB Revision

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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