Mitsubishi Montero Sport (2004+). Manual - part 328

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-725

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 16: 
Power Supply Voltage.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before. con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 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 battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 2.
NO :  Refer to INSPECTION PROCEDURE 28 

− Power 

Supply System and Ignition Switch-IG System 

P.13A-804

.

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 harness connector C-04 at the combination 
meter for damage.
Q: Is the harness 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.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK200041

22 21

23

24

25

26

27

28

29

30

31

32

AB

CONNECTOR: C-04

C-04

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-726

STEP 4. Measure the power supply voltage at combination 
meter harness side connector C-04.
(1) Disconnect the connector C-04 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 24 and ground.

• Voltage should be battery positive voltage.

(4)  Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 5.
NO :  Check harness connectors D-06 and D-08 at 

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

P.00E-2

. If intermediate 

connectors D-06 and D-08 are in good condition, 
repair it because of open circuit between ignition 
switch connector D-15 (terminal No. 2) and 
combination meter connector C-04 (terminal No. 24). 
Then confirm that the malfunction symptom is 
eliminated.

STEP 5. Check harness connector C-89 at the PCM for 
damage.
Q: Is the harness 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.

AK200041

22 21

23

24

25

26

27

28

29

30

31

32

AB

CONNECTOR: C-04

C-04

HARNESS CONNECTOR:
COMPONENT SIDE

AK303789

31

32

30 29 28

27 26 25 24 23 22 21

C-04 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

AK103914

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

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-727

STEP 6. Measure the power supply voltage at PCM 
connector C-89.
(1) Disconnect the connector C-89 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 22 and ground.

•  Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Replace the PCM. Then confirm that the malfunction 

symptom is eliminated.

NO :  Check harness connector C-16 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-16 is 

in good condition, repair an open circuit between 
combination meter connector C-04 (terminal No. 23) 
and PCM connector C-89 (terminal No. 22). Then 
confirm that the malfunction symptom is eliminated.

AK103914

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

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01508AI

C-89 HARNESS CONNECTOR: 
COMPONENT SIDE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-728

INSPECTION PROCEDURE 4: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check 
Engine Lamp) Remains Illuminated and Never Goes Out.

GREEN-

WHITE

AK302270

Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit

BL

ACK

-

WHITE

BL

ACK

-

WHITE

GREEN-

WHITE

9

23

22

8

4

2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

1

D-06

D-06

D-08

JUNCTION
BLOCK

ST

LOCK

ACC

IG1

R

2

1
3

2
4

D-08
(MU801342)

1 2 3
4 5 6

D-15

IGNITION
SWITCH

22

21

23 24 25 26 27

28 29 30 31 32

C-04

Malfunction Indicator Lamp
(SERVICE ENGINE SOON or
Check Engine Lamp)

POWERTRAIN CONTROL
MODULE (PCM)

24

IG2

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15 16 17 18 19 20 21 22

C-16
MU801461

10

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

31 32 33

34 35

1

C-89
(MU803784)

10A

8

AK103912AD

CONNECTOR: C-04

C-04

AK103911AE

CONNECTOR: C-16

C-16