Mitsubishi Eclipse. Manual - part 443

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-315

STEP 2. Check the right bank heated oxygen sensor (rear).
(1) Disconnect the right bank heated oxygen sensor (rear) 

connector B-28 and connect test harness special tool, 
MB991316, to the connector on the right bank heated 
oxygen sensor (rear) side.

(2) Warm up the engine until engine coolant 80

°C (176°F) or 

higher.

CAUTION

Be very careful when connecting the jumper wires; incor-
rect connection can damage the right bank heated oxygen 
sensor (rear).

(3) Use the jumper wires to connect terminal No. 1 (red clip) to 

the positive battery terminal and terminal No. 3 (blue clip) to 
the negative battery terminal.

(4) Connect a digital volt meter between terminal No. 2 (black 

clip) and terminal No. 4 (white clip).

(5) While repeatedly revving the engine, measure the right 

bank heated oxygen sensor (rear) output voltage.

Standard value: 0.6 

− 1.0 volt

Q: Is the voltage between 0.6 and 1.0 volt?

YES : Go to Step 3.
NO :  Replace the right bank heated oxygen sensor (rear). 

Then go to Step 4.

AK300429

1

2

3

4

RIGHT BANK 
HEATED OXYGEN
SENSOR (REAR)

CONNECTOR: B-28

AB

B-28 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01625 AB

BLUE

JUMPER
WIRES

BLACK

RED

WHITE

MB991316

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-316

STEP 3. Check harness connector B-28 at right bank 
heated oxygen sensor (rear) and harness connector C-58, 
C-62 at ECM or C-55, C-59 at PCM for damage.
Q: Is the harness connector in good condition?

YES : Replace the PCM.Then go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 4.

AK300429

1

2

3

4

RIGHT BANK 
HEATED OXYGEN
SENSOR (REAR)

CONNECTOR: B-28

AB

B-28 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300441

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97 96

100

89

78

71

90

76

77

75

72
79

CONNECTORS: C-58, C-62 <M/T>

C-58 (GR)

C-62 (GR)

AB

C-62 HARNESS CONNECTOR:
COMPONENT SIDE

C-58 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-317

STEP 4. 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 4 − 

Heated Oxygen Sensor Monitor 

P.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK300459

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

CONNECTORS: C-55, C-59 <A/T>

C-55 (GR)

C-59 (GR)

AB

C-59 HARNESS CONNECTOR:
COMPONENT SIDE

C-55 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-318

DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 2)

AK101600

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

BROWN

3 4

1 2

BATTERY

MFI
RELAY

RIGHT BANK HEATED
OXYGEN SENSOR (REAR)

TO ECM
OR PCM

TO ECM
OR PCM

4

3

1

4

2

2

1

3

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

27

     B-28
MU802665

C-51 <M/T>, C-52 <A/T>
         (MU803784)

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

3132 33

34 35

1

10

Right Bank Heated Oxygen Sensor (rear) Heater Circuit

3 4

1 2

A-18X