Mitsubishi Montero Sport (2004+). Manual - part 289

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-569

STEP 3. Measure the 5-volt supply circuit voltage at fuel 
tank differential pressure sensor connector E-28.
(1) Disconnect fuel tank differential pressure sensor connector 

E-28.

(2) Connect special tool MB991658 between pressure sensor 

connector terminal 1, 2 and 3.

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

• Voltage should measure between 4.7 and 5.1 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.7 and 5.1 volts?

YES : Go to Step 4 .
NO :  Go to Step 10 .

STEP 4. Measure the ground circuit voltage at fuel tank 
differential pressure sensor connector E-28. 
(1) Disconnect fuel tank differential pressure sensor connector 

E-28.

(2) Connect special tool MB991658 to connect terminal 3 of the 

disconnected sensor connector and those of the harness 
side connector respectively.

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage at the fuel tank differential pressure 

sensor side connector between terminal 2 and ground.

• Voltage should measure 0.5 volt or less.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?

YES : Go to Step 5 .
NO :  Go to Step 12 .

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AH

E-28 (B)

2 1

3

E-28 HARNESS SIDE 
CONNECTOR

AC002081AB

MB991658

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AH

E-28 (B)

2 1

3

E-28 HARNESS SIDE 
CONNECTOR

AC002081AB

MB991658

FUEL TANK DIFFERENTIAL 
PRESSURE SENSOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-570

STEP 5. Check connectors E-44, C-16, C-71 at intermediate 
connector and C-90 at PCM and E-28 at fuel tank 
differential pressure sensor for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

AC203242 AC

CONNECTOR: E-44

E-44

E-44 MALE SIDE CONNECTOR

20

19

7

16

6

17

15

5

14

18

8

4

11

3

12

2

9

1

10

13

AC203236 AC

CONNECTOR: C-16

C-16

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

C-16 MALE SIDE 
CONNECTOR

AC203241

CONNECTOR: C-71

AD

C-71

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

C-71 JOINT CONNECTOR

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AH

E-28 (B)

2 1

3

E-28 HARNESS SIDE 
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-571

Q: Are the connectors in good condition?

YES : Go to Step 6 .
NO :  Repair or replace the damaged components. (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

). Then go to Step 16 .

PCM

60

46

66

57

45

44

64

55 56

65

62 63

52 53

5051

61

42

59

48

41
47
58

43
49

54

AC202313

C-90 (GR)

AC

CONNECTOR: C-90

C-90 (GR)

C-90 HARNESS SIDE CONNECTOR 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-572

STEP 6. Check the harness wire for open circuit between 
PCM connector C-90 terminal 57 and fuel tank differential 
pressure sensor connector E-28 terminal 2 for damage.
Q: Are the harness wires in good condition?

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

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

− How to 

Cope with Intermittent Malfunction 

P.00-7

). Then go 

to Step 16 .

NO :  Repair or replace the harness wire. Then go to 16 .

PCM

60

46

66

57

45

44

64

55 56

65

62 63

52 53

5051

61

42

59

48

41
47
58

43
49

54

AC202313

C-90 (GR)

AC

CONNECTOR: C-90

C-90 (GR)

C-90 HARNESS SIDE CONNECTOR 

AC002614

CONNECTOR: E-28

FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR

AH

E-28 (B)

2 1

3

E-28 HARNESS SIDE 
CONNECTOR