Mitsubishi Montero Sport (2004+). Manual — part 284

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-549

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-550

Q: Are the connectors and terminals 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-551

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 the damaged harness wires. 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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-552

STEP 7. Measure the output circuit voltage at PCM
connector C-91 by backprobing.
(1) Do not disconnect PCM connector C-91.

(2) Disconnect hose E from the evaporative emission canister

side, and plug the hose.

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

(4) Measure the voltage between terminal 92 and ground by

backprobing.

• The measured voltage should measure between 2.0

and 3.0 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect the evaporative emission system pressure

pump, and reinstall the fuel cap.

(7) Connect hose E to the canister.
Q: Is the measured voltage between 2.0 and 3.0 volts?

YES : Go to Step 8 .
NO : Go to Step 9 .

PCM

89
98

88
97

76 77

87

86

83
94

84
95

85

96

80
92

81
93

79

78
90 91

82

74

71 72 73

75

AC202312

CONNECTORS: C-91

AC

C-91 (GR)

C-91 HARNESS SIDE CONNECTOR

AC005140

HOSE E

AC

AC005153 AC

C-91 HARNESS CONNECTOR:
HARNESS SIDE