Mitsubishi Colt Ralliart. Manual - part 132

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-19

<From Jun. 2006 models>

AC600433AB

1

2

3

4

5

7

6

Removal steps 

1.

Purge hose connection

2.

Vapour hose

3.

Vent connector

4.

Vapour hose

5.

Canister

6.

Clamp

7.

Canister bracket

EXHAUST GAS RECIRCULATION (EGR) VALVE

GENERAL INFORMATION (EGR SYSTEM) 
<4A9-CVT>

M1173005200822

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 inlet 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.

Removal steps (Continued)

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-20

SYSTEM DIAGRAM

AK306111

EGR valve
(stepper motor)

Engine
control
relay

Battery

Engine-CVT-ECU

Manifold absolute
pressure sensor

Engine coolant
temperature sensor

Crank angle sensor

Throttle position sensor

AC 

COMPONENT LOCATION (EGR SYSTEM) 
<4A9-CVT>

M1173007600503

AK402709AB

EGR valve
(stepper motor)

EGR VALVE (STEPPER MOTOR) CHECK 
<4A9-CVT>

M1173050200349

CHECKING THE OPERATION SOUND

AK402709AB

EGR valve
(stepper motor)

1. Check that the operation sound of the stepper 

motor can be heard from the EGR valve when the 
ignition switch is turned ON (without starting the 
engine).

2. If the operation sound cannot be heard, inspect 

the drive circuit of the stepper motor.

NOTE: If the circuit is normal, either the stepper 
motor or the engine-CVT-ECU may have failed.

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-21

CHECKING THE COIL RESISTANCE

AK200805

1 2 3
4 5 6

1 2 3
4 5 6

AC

1. Remove the EGR valve.
2. Measure the resistance between terminal No. 2 

and either terminal No. 1 or terminal No. 3 of the 
connector at the EGR valve.

Standard value: 20 

− 24 Ω (at 20°C)

3. Measure the resistance between terminal No. 5 

and either terminal No. 6 or terminal No. 4 of the 
connector at the EGR valve.

Standard value: 20 

− 24 Ω (at 20°C)

4. Using a new gasket, install the EGR valve by 

tightening its mounting bolts to the specified 
torque.

Tightening Torque: 18 

± 1 N⋅m

OPERATION CHECK

AK202365

1 2 3
4 5 6

AD

EGR valve

1. Remove the EGR valve.
2. Attach a test wiring harness (special tool 

MB991658) to the connector at the EGR valve.

AK402710

Battery

MB991658

AB

CAUTION

Connecting battery voltage to the EGR valve for a 
long term could damage the coil.
3. Connect the positive (+) terminal of the battery to 

terminal No. 2.

4. Connect terminals No. 1 and No. 3 to the negative 

(-) terminal of the battery, in order to test whether 
the stepper motor vibrates (with a slight shudder), 
indicating that the stepper motor is operating.

AK402711

Battery

MB991658

AB

CAUTION

Connecting battery voltage to the EGR valve for a 
long term could damage the coil.
5. Connect the positive (+) terminal of the battery to 

terminal No. 5.

6. Connect terminals No. 4 and No. 6 to the negative 

(-) terminal of the battery, in order to test whether 
the stepper motor vibrates (with a slight shudder), 
indicating that the stepper motor is operating.

7. If a vibration can be felt during the test, the 

stepper motor is normal.

8. Using a new gasket, install the EGR valve by 

tightening its mounting bolts to the specified 
torque.

Tightening torque: 18 

± 1 N⋅m

CLEANING THE EGR VALVE

CAUTION

Do not use a solvent or detergent, which could 
enter the motor and cause it to malfunction.
1. Remove the EGR valve and check that the EGR 

valve is not stuck or clogged with carbon deposits. 
Use a wire brush to clean the valve if necessary.

2.  Using a new gasket, install the EGR valve by 

tightening its mounting bolts to the specified 
torque.

Tightening torque: 18 

± 1 N⋅m

Main

Index

Group

TOC

EMISSION CONTROL

ENGINE AND EMISSION CONTROL

17-22

REMOVAL AND INSTALLATION <4A9-CVT>

M1173010500692

Pre-removal and Post-installation Operation
• Air Cleaner Assembly, Air Cleaner Duct Removal and 

Installation (Refer to GROUP 15, Air Cleaner 

P.15-5

).

• Throttle Body Assembly Removal and Installation (Refer 

to GROUP13A, Throttle Body 

P.13A-370

).

• Starter assembly Removal and Installation (Refer to 

GROUP16, Starter 

P.16-22

).

AC601296AB

N

9

18 ± 1 N·m

10

16

17

12

15

N

14

13

N

18

N

19

18 ± 1 N·m

18 ± 1 N·m

7.6 ± 0.6 N·m

1

2

3

4

5

6

7

8

11

18 ± 1 N·m

Removal steps 

1.

Harness clamp connection

2.

Oxygen sensor connector

3.

Brake booster vacuum hose 
connection

4.

Brake booster vacuum pipe and 
brake booster vacuum hose 
assembly

5.

Harness clamp connection

6.

Purge solenoid valve connector

7.

Purge hose connection

8.

Engine hanger, purge solenoid 
valve and purge solenoid assembly

9.

Harness clamp connection

10. EGR stay
11. EGR valve connector
12. EGR valve and EGR valve pipe 

assembly

13. EGR valve gasket
14. EGR equip pipe

>>

C

<<

15. EGR valve gasket
16. EGR valve
17. EGR valve pipe

>>

B

<<

18. EGR pipe gasket B

>>

A

<<

19. EGR pipe gasket A

Removal steps (Continued)

Main

Index

Group

TOC