Mitsubishi Galant. Manual — part 325

ON-VEHICLE SERVICE

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-525

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002800085

Refer to GROUP 13A, On-vehicle Service

−

Intake Air

Temperature Sensor Check(

P.13A-443

).

ENGINE COOLANT TEMPERATURE SENSOR
CHECK

M1131003100089

Refer to GROUP 13A, On-vehicle Service

−

Engine Coolant

Temperature Sensor Check (

P.13A-443

).

THROTTLE POSITION SENSOR CHECK

M1131003200097

HEATED OXYGEN SENSOR CHECK

M1131005000107

Required Special Tools:
MD998464: Test Harness
MB991316: Test Harness
MB991658: Test Harness Set
<Right bank and left bank heated oxygen sensor (front)>
1. Use scan tool MB991502, observe HO

2

S reading. If values

are unsatisfactory, or if the scan tool is not available, use the
following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MD998464 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [4.5

−

8.0 ohm at 20

°

C

(68

°Φ)

] between terminal 1 (red clip of special tool) and

terminal 3 (blue clip of special tool) on the heated oxygen
sensor connector.

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°

C (176

°

F)

or higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.

(5) Use the jumper wires to connect terminal 1 (red clip) of

the heated oxygen sensor connector to the positive
battery terminal and terminal 3 (blue clip) to the negative
battery terminal.

(6) Connect a digital voltage meter between terminal 2 (black

clip) and terminal 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

Standard value:

AKX01624

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

MD998464

BLUE

RED

AC

AKX01625AC

BLUE

RED

BLACK

JUMPER
WIRES

WHITE

MD998464

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-526

3. If the sensor is defective, replace the heated oxygen sensor.

NOTE: For removal and installation of the heated oxygen
sensor, refer to GROUP 15, Exhaust Pipe and Main Muffler
(

P.15-19

).

<Right bank and left bank heated oxygen sensor (rear)>
1. Use scan tool MB991502, observe HO2S reading. If values

are unsatisfactory, or if the scan tool is not available, use the
following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MD998464 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [11

−

18 ohm at 20

°

C

(68

°Φ)

] between terminal 1 (red clip of special tool) and

terminal 3 (blue clip of special tool) on the heated oxygen
sensor connector.

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°

C (176

°

F)

or higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.

(5) Use the jumper wires to connect terminal 1 (red clip) of

the heated oxygen sensor connector to the positive
battery terminal and terminal 3 (blue clip) to the negative
battery terminal.

(6) Connect a digital voltage meter between terminal 2 (black

clip) and terminal 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

Standard value:

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When revving
engine

0.6

−

1.0V

If you make the air/
fuel ratio rich by
revving the engine
repeatedly, a
normal heated
oxygen sensor will
output a voltage of
0.6

−

1.0V.

AKX01624 AB

MB991316

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

BLUE

RED

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

INJECTOR

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-527

3. If the sensor is defective, replace the heated oxygen sensor.

NOTE: For removal and installation of the heated oxygen
sensor, refer to GROUP 15, Exhaust Pipe and Main
Muffler(

P.15-19

).

INJECTOR CHECK

M1131005200093

IDLE AIR CONTROL MOTOR (STEPPER MOTOR)
CHECK

M1131005400116

Refer to GROUP 13A, On-vehicle Service

−

Idle Air Control

Motor (Stepper Motor) Check (

P.13A-447

).

EVAPORATIVE EMISSION PURGE SOLENOID
CHECK

M1131005600080

Refer to GROUP 17, Emission Control System

−

Evaporative

Emission Control System

−

Evaporative Emission Purge

Solenoid Check (

P.17-86

).

EGR SOLENOID CHECK

M1131005700087

Refer to GROUP 17, Emission Control System

−

Exhaust Gas

Recirculation (EGR) System - EGR Solenoid Check (

P.17-93

).

IN JEC TO R

REMOVAL AND INSTALLATION

M1131007100092

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When revving
engine

0.6

−

1.0V

If you make the air/
fuel ratio rich by
revving the engine
repeatedly, a
normal heated
oxygen sensor will
output a voltage of
0.6

−

1.0 V.

Pre-removal Operation

•

Fuel Pressure Reduction (Refer to

P.13B-524

.)

•

Engine Coolant Draining [Refer to GROUP 00,
Maintenance Service

−

Engine Coolant (Change)

P.00-

50

.]

•

Intake Manifold Plenum Removal (Refer to GROUP 15,
Intake Manifold Plenum

P.15-5

.)

Post-installation Operation

•

Intake Manifold Plenum Installation (Refer to GROUP 15,
Intake Manifold Plenum

P.15-5

.)

•

Engine Coolant Refilling [Refer to GROUP 00,
Maintenance Service

−

Engine Coolant (Change)

P.00-

50

.]

•

Fuel Leakage Inspection.

INJECTOR

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-528

REMOVAL SERVICE POINT

<<A>>FUEL RAIL/INJECTORS REMOVAL

CAUTION

Do not drop the injector.
Remove the fuel rail with the injectors attached to it.

INSTALLATION SERVICE POINT

>>A<<INJECTORS/FUEL PRESSURE REGULATOR/HIGH-
PRESSURE FUEL HOSE INSTALLATION

CAUTION

Do not allow the engine oil to enter the fuel rail, otherwise
it will be damaged.
1. Apply a drop of new engine oil to the O-ring.

2. Turn the injector. To the right and left to install to the fuel rail.

Repeat for fuel pressure regulator and high-pressure fuel
hose.
Be careful not to damage the O-ring. After installing, check
that the item turns smoothly.

AC001623

1

2

3

4

5

6

7

8

9

9

9

9

10

11

12

13

11

12

13

10

1

8

2, 6

3, 7

12

11

N

N

N

N

N

N

N

N

9.8 – 13 N·m
87 – 115 in-lb

4.9 N·m
43 in-lb

8.8 N·m
78 in-lb

ENGINE OIL

AC

REMOVAL STEPS

1.

INJECTOR CONNECTOR

>>A<<

2.

HIGH-PRESSURE FUEL HOSE
CONNECTION

3.

O-RING

4.

FUEL RETURN HOSE
CONNECTION

5.

VACUUM HOSE CONNECTION

>>A<<

6.

FUEL PRESSURE REGULATOR

7.

O-RING

<<A>>

8.

FUEL RAIL

9.

INSULATORS

10. INSULATORS

<<A>>

>>A<<

11. INJECTORS
12. O-RING
13. GROMMETS

REMOVAL STEPS (Continued)