Mitsubishi Galant. Manual — part 160

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-321

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) <2.4L>

13A-322

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

AK000478

24 25

21

26 27

22 23

29 30 3132

28

35 36

34

33

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

C-78
(MU801457)

R

IG2

ST

LOCK

ACC

IG1

C-73
MU801331

IGNITION
SWITCH

C-58

2

6

6

JUNCTION
BLOCK

29

C-29

4 5

1

6 7

2 3

10 1112

9

15 16

14

13

C-30

6

C-17

SERVICE ENGINE SOON/
MALFUNCTION
INDICATOR LAMP

C-39
(MU803784)

POWERTRAIN CONTROL
MODULE(PCM)

21

22

1

6

4

5

11

10

12 13

15

17

16

14

19

18

8 9

7

20

2 3

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

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

8

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-323

CIRCUIT OPERATION

•

The service engine soon/malfunction indicator
lamp power is supplied from the ignition switch.

•

The PCM controls the ground of the service
engine soon/malfunction indicator lamp by
turning the power transistor in the PCM ON and
OFF.

COMMENT

•

In cases such as the above, the cause is
probably that the PCM is detecting a problem in a
sensor or actuator, or that one of the malfunctions
listed at right has probably occurred.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

•

Short-circuit between the service engine soon/
malfunction indicator lamp and PCM.

•

Malfunction of the PCM.

DIAGNOSIS

Required Special Tool:
MB991502:Scan Tool (MUT-II)

AK000633AC

CONNECTOR:C-29

AK000280

CONNECTOR : C-39

PCM

AW

AK000631AC

CONNECTOR:C-73

AK000634 AB

CONNECTOR:C-58

AK000631AB

CONNECTOR:C-78

AK000566AB

CONNECTOR:C-17

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-324

STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).

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

Q: Is the DTC is output?

YES : Refer to Diagnostic Trouble Code Chart (

P.13A-20

).

NO : Go to Step. 2.

STEP 2. Check the continuity at combination meter
harness side connector C-30.
(1) Disconnect the connector C-30 and measure at the harness

side.

(2) Check for the continuity between terminal 6 and ground.

•

Should be open loop.

Q: Is the continuity normal?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Check harness connectors C-17 at the 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 short
circuit to ground. Then confirm that the malfunction
symptom is eliminated.

INSPECTION PROCEDURE 5: Cranks, Won't Start

Cranks, Won't Start Circuit

•

Refer to, Ignition circuit (

P.13A-396

).

CIRCUIT OPERATION

•

Refer to, Ignition circuit (

P.13A-396

).

COMMENT

•

In cases such as the above, the cause is
probably no spark, fuel delivery, or fuel quality
problems. In addition, foreign materials (water,
kerosene, etc.) may be mixed with the fuel.

TROUBLESHOOTING HINTS (The most likely
causes for this case: ）

））

）

•

Malfunction of the ignition system.

•

Malfunction of the fuel pump system.

•

Malfunction of the injector system.

•

Malfunction of the PCM.

•

Contaminated fuel.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

AC003081 AB

16 PIN

MB991502

AK000636

16 1514 13

1110

9 8 7 6 5 4 3

1

2

12

C-30 HARNESS
SIDE CONNECTOR

AB