Mitsubishi Galant (2004+). Manual - part 1318

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-965

13B

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Comunication with All 
Systems Is Not Possible.)

AK302874

RED-BLA

CK

BLA

CK

BLA

CK

RED

12

1

5

16

C-125

(MU803797)

C-211

DATA LINK
CONNECTOR

4

JUNCTION
BLOCK

FUSIBLE
LINK (1)

1

C-216

(MU801403)

Data Link Connector Circuit

10

15A

1

6

4 5

11

10

1213

15

17

16

14

19

18

8 9

7

20

2 3

2122 23 2425 26 27 28

AK303209AB

CONNECTOR: C-125

DATA LINK 
CONNECTOR

C-125

ACCELERATOR
PEDAL

AK303210

CONNECTOR: C-216

C-216

AB

JUNCTION
BLOCK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-966

.

CIRCUIT OPERATION

• A battery positive voltage is applied on the data 

link connector power terminal (terminal No. 16). 
The ground terminals (terminal No. 4, No. 5) are 
grounded to the vehicle body.

.

COMMENT

• The cause is probably a defect in power supply 

system (including ground) for the on-board diag-
nostic test mode line.

.

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

• Malfunction of the data link connector.

• Damaged harness wire.

DIAGNOSIS

STEP 1. Measure the power supply voltage at data link 
connector C-125.

(1) Measure voltage between terminal No. 16 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to step 2.
NO :  Check harness connectors C-211, C-216 and C-29 at 

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

P.00E-2

. If intermediate 

connector C-211, C-216 and C-29 are in good 
condition, repair an open circuit between fusible link 
(1) and data link connector C-125 (terminal No. 16). 
Then confirm that the malfunction symptom is 
eliminated.

AK303227

CONNECTOR: C-211

C-211

AB

JUNCTION
BLOCK

AK303231

CONNECTOR: C-29

C-29

AB

AK303228

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AB

CONNECTOR: C-125

DATA LINK 
CONNECTOR

C-125

ACCELERATOR
PEDAL

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303229

1 2 3 4 5 6 7 8

16

15

14

13

12

11

10

9

C-125 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-967

STEP 2. Check the continuity at data link connector C-125.

(1) Check for the continuity between terminal No. 4, No. 5 and 

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Replace the scan tool. Then confirm that the 

malfunction symptom is eliminated.

NO :  Repair an open circuit or harness damage between 

data link connector C-125 (terminal No. 4, No. 5) and 
ground. Then confirm that the malfunction symptom is 
eliminated.

AK303228

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AB

CONNECTOR: C-125

DATA LINK 
CONNECTOR

C-125

ACCELERATOR
PEDAL

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303230

1 2 3 4 5 6 7 8

16

15

14

13

12

11

10

9

D-125 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-968

INSPECTION PROCEDURE 2: Scan Tool Communication with PCM Is Not Possible.

ORANGE-BLUE

ORANGE-BLUE

AK302875

15

7

DATA LINK
CONNECTOR

13

POWERTRAIN
CONTROL
MODULE (PCM)

C-29

C-125

(MU803797)

Data Link Connector Circuit

B-19

1 2 3 4

5 6 7

8 9 10 11

12 13 14

15 16 17 18

AK303209AB

CONNECTOR: C-125

DATA LINK 
CONNECTOR

C-125

ACCELERATOR
PEDAL

AK303147

CONNECTOR: B-19

PCM

AB

AIR CLEANER

B-19 (B)