Mitsubishi Eclipse. Manual - part 448

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-335

STEP 2. Check the sensor output voltage at left bank 
heated oxygen sensor (front) connector B-24 by 
backprobing.
(1) Do not disconnect the connector B-24.
(2) Start the engine and run at idle.

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

backprobing.

• Warming up the engine. When the engine is 2,500 r/min, 

the output voltage should repeat 0 to 0.8 volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 3.
NO :  Go to Step 7.

AK300424

1

2

3

4

LEFT BANK 
HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-24

AB

B-24 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01541AS

1 2
3 4

B-24 HARNESS 
CONNECTOR: 
HARNESS SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-336

STEP 3. Check the sensor output voltage at ECM 
connector C-62 <M/T> or PCM connector C-59 <A/T> by 
backprobing.
(1) Do not disconnect the connector C-62 <M/T> or C-59 

<A/T>.

(2) Start the engine and run at idle.

AK300460

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

CONNECTOR: C-59 <A/T>

C-59 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300445

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

CONNECTOR: C-62 <M/T>

C-62 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-337

(3) Measure the voltage between terminal No. 71 and ground 

by backprobing.

• Warming up the engine. When the engine is 2,500 r/min, 

the output voltage should repeat 0 to 0.8 volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 4.
NO :  Go to Step 6.

AK000244

71 72

73 74

78

80 81

79

82 83 84 85 86 87 88 89

75 76

91 92 93

94 95

96

98

99

97

AK000244AE

<M/T>

C-62 HARNESS 
CONNECTOR: 
HARNESS SIDE

77

90

100

AKX01539

AKX01539

7172 73 74

75 76 77

78 79 80 81 82 83 84 85 86 87 88 89
90 91

92 93 94

95 96

97 98

C-59 HARNESS 
CONNECTOR: 
HARNESS SIDE

AI

<A/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-338

STEP 4. Check connector B-24 at left bank heated oxygen 
sensor (front) and connector C-62 at ECM <M/T> or 
connector C-59 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 15.

AK300424

1

2

3

4

LEFT BANK 
HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-24

AB

B-24 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300460

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

CONNECTOR: C-59 <A/T>

C-59 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE