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
).
• Cowl Top Panel Front Removal and Installation (Refer to
GROUP 42, Loose Panel
).
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)
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