Mitsubishi Montero Sport (2004+). Manual - part 269

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-489

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 actuator test 
item 10: EGR vacuum regulator solenoid valve.

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 actuator test mode for item 

10, EGR vacuum regulator solenoid valve.

• An operation sound should be heard and vibration 

should be felt when the EGR vacuum regulator solenoid 
valve is operated.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-7

.

NO :  Go to Step 2.

STEP 2. Check connector A-11 at the EGR vacuum 
regulator solenoid valve for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK200025

AK200025

1

2

CONNECTOR: A-11

AB

A-11(BR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-490

STEP 3 Check the EGR vacuum regulator solenoid valve.
(1) Disconnect the EGR vacuum regulator solenoid valve 

connector A-11.

(2) Measure the resistance between EGR vacuum regulator 

solenoid valve side connector terminal No. 1 and No. 2.

   Standard value: 30 

− 34 ohms [at 20°C (68°F)]

Q: Is the resistance between 30 and 34 ohms [at 

20

°C(68°F)]?

YES : Go to Step 4.
NO :  Replace the EGR vacuum regulator solenoid valve. 

Then go to Step 12.

STEP 4. Measure the power supply voltage at EGR vacuum 
regulator solenoid valve harness side connector A-11.
(1) Disconnect the connector A-11 and measure at the harness 

side.

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

(3) Measure the voltage between terminal No. 1 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 6.
NO :  Go to Step 5.

AK200025

AK200025

1

2

CONNECTOR: A-11

AB

A-11(BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200932

AK200025

AK200025

1

2

CONNECTOR: A-11

AB

A-11(BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000254AO

A-11 HARNESS 
CONNECTOR: 
COMPONENT SIDE

2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-491

STEP 5. Check connector C-59 at MFI relay for damage.
Q: Is the connector in good condition?

YES : Check connector C-14 at intermediate connector for 

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

P.00E-2

. If intermediate connector is in good 

condition, repair harness wire between MFI relay 
connector C-59 (terminal No. 1) and EGR vacuum 
regulator solenoid valve connector A-11 (terminal No. 
1) because of open circuit or short circuit to ground. 
Then go to Step 12.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

STEP 6. Measure the power supply voltage at PCM 
connector C-89 by backprobing.
(1) Do not disconnect the connector C-89.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 6 and ground by 

backprobing.

• 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 9.
NO :  Go to Step 7.

AK200023

2 1

3

4

CONNECTOR: C-59

AB

C-59

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

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

AKX01546

1

2

3 4

5 6

7 8

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

C-89 HARNESS 
CONNECTOR: 
HARNESS SIDE

AF

9

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-492

STEP 7. Check connector C-89 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

STEP 8. Check for open circuit and short circuit to ground 
between EGR vacuum regulator solenoid valve connector 
A-11 (terminal No. 2) and PCM connector C-89 (terminal 
No. 6).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

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

AK200025

AK200025

1

2

CONNECTOR: A-11

AB

A-11(BR)

HARNESS CONNECTOR:
COMPONENT SIDE

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