Mitsubishi Galant. Manual — part 293

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-397

STEP 1. Using scan tool MB991502, check data list item 16:
Power Supply Voltage.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before.
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

16, Power Supply Voltage.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 2.
NO : Refer to INSPECTION PROCEDURE 29

−

Power

Supply System and Ignition Switch-IG System(

P.13B-

466

).

STEP 2. Check the burned-out bulb.

Q: Is the valve normal?

YES : Go to step 3.
NO : Replace the bulb. Then confirm that the malfunction

symptom is eliminated.

STEP 3. Check connector C-29,C-30 at the combination
meter for damage.
Q: Is the connector in good condition?

YES : Go to step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AC003081 AB

16 PIN

MB991502

AK000633

C-29

C-30

CONNECTORS:C-29,C-30

AG

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-398

STEP 4. Check the power supply voltage at combination
meter harness side connector C-29.
(1) Disconnect the connector C-29 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 29 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 5.
NO : Check harness connectors C-73 and C-78 at

intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection(

P.00E-2

). If intermediate

connectors are in good condition, repair harness wire
between ignition switch connector C-58 terminal 2
and combination meter connector C-29 terminal 29
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 5. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then confirm that the

malfunction symptom is eliminated.

AK000635

C-29 HARNESS
SIDE CONNECTOR

36 35 3433 32 31302928

27 26252423 22 21

AB

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-399

STEP 6. Check the power supply voltage PCM connector
C-39.
(1) Disconnect the connector C-39 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 22 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Check harness connectors C-17 at intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection(

P.00E-2

). If intermediate connectors is in

good condition, repair harness wire between
combination meter connector C-30 terminal 6 and
PCM connector C-39 terminal 22 because of open
circuit. Then confirm that the malfunction symptom is
eliminated.

AK000377

8 7

6 5

4 3

2

1
9

10

11

12

13

14

15

16

17

18

19

20

21

22

23
35 34

33 32 3130

2928 27 26

25 24

C-39 HARNESS
SIDE CONNECTOR

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-400

INSPECTION PROCEDURE 4: The Service Engine Soon/Malfunction Indicator Lamp Remains
Illuminated and Never Goes Out.

AK000521

3

2

4 5 6

1 2 3
4 5 6

BLA

CK-

WHITE

1

BR

O

WN-

BLA

CK

BR

O

WN-

BLA

CK

BLA

CK-

WHITE

R

IG2

ST

LOCK

ACC

IG1

C-73
MU801331

IGNITION
SWITCH

C-58

2

6

6

JUNCTION
BLOCK

29

6

SERVICE ENGINE SOON/
MALFUNCTION INDICATOR LAMP

POWERTRAIN CONTROL
MODULE(PCM)

21

22

C-78
MU803457

1

6

4

5

11

10

12 13

15

17

16

14

19

18

8 9

7

20

2 3

C-17

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

C-39
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

24 25

21

26 27

22 23

29 30 3132

28

35 36

34

33

C-29

4 5

1

6 7

2 3

10 1112

9

15 16

14

13

C-30

8