Mitsubishi Montero Sport (2004+). Manual - part 235

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-353

STEP 2. Check for short circuit to ground and harness 
damage between left bank heated oxygen sensor (rear) 
connector E-48 (terminal No. 4) and PCM connector C-91 
(terminal No. 73).

NOTE: Check harness after checking intermediate connector 
C-79 and E-45. If intermediate connector C-79 and E-45 is 
damaged, repair or replace it. Refer to GROUP 00E, Harness 
Connector Inspection 

P.00E-2

. Then go to Step 3.

Q: Is the harness wire in good condition?

YES : Go to Step 3.
NO :  Repair it. Then go to Step 3.

AK200498

1

2

3

4

E-48(B)

AB

CONNECTOR: E-48

HARNESS 
CONNECTOR: 
COMPONENT SIDE

LEFT BANK
HEATED OXYGEN
SENSOR (REAR)

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-354

STEP 3. 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 P0158 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-355

DTC P0159: Heated Oxygen Sensor Circuit Slow Response (bank 2, sensor 2)

AK303392

Left Bank Heated Oxygen Sensor (rear) Circuit

BL

ACK

BL

ACK

BL

ACK

BL

ACK

WHITE

BL

ACK

BL

ACK

BL

ACK

WHITE

WHITE

BL

ACK

-RED

BL

ACK

-RED

POWERTRAIN CONTROL MODULE (PCM)

1

10

15

2

11

3

12

4

13 14

5

16

6

17

7

18

8

19

9

20

E-44

73

57

19

5

16

10

12

8

2

7

4

2

3

1

C-91

C-90

FROM MFI RELAY

TO PCM

LEFT BANK HEATED
OXYGEN SENSOR (REAR)

1

10

15

2

11

3

12

4

13 14

5

16

6

17

7

18

8

19

9

20

E-45

E-45

47

41

42 43

48 49 50 51 52 53 54 55 56 57

46

45

44

58

59

60 61 62 63

64 65 66

C-90
(MU803781)

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-71

71

76

77

72 73 74

75

79 80

78

81

87 88

89

91

90

92

97

98

82

93

83

94

84 85

95

86

96

C-91
(MU803782)

1 2
3 4

E-48
MU802605

6

10

2

7

8

3 4 5

9

11 12 13

1

C-79
MU801553

JOINT
CONNECTOR (4)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-356

.

AK200497

LEFT BANK
HEATED OXYGEN
SENSOR (REAR)

E-48(B)

AB

CONNECTOR: E-48

AK103738AE

CONNECTORS: C-90, C-91

PCM

C-91(GR)

C-90(GR)

AK200018 AB

CONNECTOR: E-44

E-44

AK103912AB

CONNECTOR: C-71

C-71

AK200018 AC

CONNECTOR: E-45

E-45(B)

AK103911AC

CONNECTOR: C-79

C-79