Mitsubishi Grandis. Manual - part 806

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-65

SYSTEM DIAGRAM

COMPONENT LOCATION (EGR SYSTEM)

M1173007600310

EGR VALVE (STEPPER MOTOR) CHECK

M1173050200145

CHECKING THE OPERATION SOUND

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-ECU <M/T> or engine-A/T-ECU 
<A/T> may have failed.

CHECKING THE COIL RESISTANCE

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.

AK204431AC

EGR valve
(stepper motor)

Control
relay

Battery

Engine-ECU <M/T> or
Engine-A/T-ECU <A/T>

Throttle position sensor

Air flow sensor

Engine coolant
temperature sensor

Crank angle sensor

AK302840AC

EGR valve
(stepper motor)

AK302877AB

EGR valve
(stepper motor)

AK200805

1 2 3
4 5 6

1 2 3
4 5 6

AC

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-66

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: 24 

± 4 N⋅m

OPERATION CHECK

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

MB991658) to the connector at the EGR valve.

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.

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: 24 

± 3 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: 24 

± 3 N⋅m

1 2 3

4 5 6

AK203698

EGR valve

AC

AK302886

Battery

MB991658

AB

AK304039

Battery

MB991658

AB

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-67

EXHAUST GAS RECIRCULATION (EGR) VALVE REMOVAL AND INSTALLATION

M1173010500294

INSTALLATION SERVICE POINT
>>A<< EGR PIPE B GASKET 
INSTALLATION

Install the EGR valve gasket as shown in the 
illustration.

Pre-removal and Post-installation Operation
• Engine Cover and Engine Cover Bracket Removal and 

Installation (Refer to GROUP 11A, Camshaft and Valve 

Stem Seal 

P.11A-16

).

• Cowl Top Panel Front Removal and Installation (Refer to 

GROUP 42, Loose Panel 

P.42-67

).

AC313044AB

1

N

3

24 ± 3 N·m

2

Removal steps

1.

EGR valve connector

2.

EGR valve

>>A<<

3.

EGR valve gasket

AC302358AF

Gasket

Notched part

Notched part

Notched part

EMISSION CONTROL <MPI>

ENGINE AND EMISSION CONTROL

17-68

CATALYTIC CONVERTER

REMOVAL AND INSTALLATION

M1173003900483

AC310365

5

6

7

2

3

4

1

59 ± 10 N·m

12 ± 2 N·m

49 ± 5 N·m

N

N

AB

Removal steps

1.

Front exhaust pipe connection

2.

Centre exhaust pipe connection

3.

Catalytic converter

4.

Exhaust pipe gasket

5.

Seal ring

6.

Exhaust pipe damper

7.

Exhaust muffler hanger

Removal steps (Continued)