Mitsubishi Montero Sport (2004+). Manual - part 225

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-313

STEP 10. Check connector C-90, C-91 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 11.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

AK104029

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTORS: C-90, C-91

C-90(GR) C-91(GR)

C-90 HARNESS CONNECTOR:
COMPONENT SIDE

C-91 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-314

STEP 11. Check for harness damage between left bank 
heated oxygen sensor (front) connector A-09 (terminal No. 
4) and PCM connector C-91 (terminal No. 71).
Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO :  Repair it. Then go to Step 14.

AK200496

1

2

3

4

A-09(GR)

AB

CONNECTOR: A-09

HARNESS 
CONNECTOR: 
COMPONENT SIDE

LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-315

STEP 12. Check for harness damage between left bank 
injector connector and PCM connector.

a. Check the harness wire between left bank injector connec-

tor A-72 (terminal No. 2) and PCM connector C-89 (terminal 
No. 9) when checking No. 2 cylinder.

b. Check the harness wire between left bank injector connec-

tor A-71 (terminal No. 2) and PCM connector C-89 (terminal 
No. 2) when checking No. 4 cylinder.

c. Check the harness wire between left bank injector connec-

tor A-70 (terminal No. 2) and PCM connector C-89 (terminal 
No. 25) when checking No. 6 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair it. Then go to Step 14.

STEP 13. Check the fuel pressure.
Refer to On - Vehicle Service - Fuel Pressure Test 

P.13A-884

.

Q: Is the fuel pressure normal?

YES : Replace the PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0154 set?

YES : Repeat the troubleshooting.
NO :  The procedure is complete.

AK200016

1

2

AB

CONNECTORS: A-70, A-71, A-72

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR: 
COMPONENT SIDE

AK103914

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6

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9

11

12

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30

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25

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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-316

DTC P0155: Heated Oxygen Sensor Heater Circuit (bank 2 sensor 1)

AK200185

Left Bank Heated Oxygen Sensor (front) Heater Circuit

RED

RED

WHITE-

BLA

CK

RED

WHITE-

BLA

CK

WHITE-

BLA

CK

POWERTRAIN CONTROL MODULE (PCM)

1

2

22

33

1

2

4

3

4

12

29

MFI
RELAY

LEFT BANK HEATED OXYGEN
SENSOR (FRONT)

FUSIBLE LINK (12)

TO PCM TO PCM

C-59

LIGHT GREEN-RED

3

3

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-14

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)

1 2
3 4

A-09
MU802665

JOINT
CONNECTOR (5)

1

2

3

4