Mitsubishi Outlander (2003+). Manual — part 50

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-63

STEP 5. Check harness between B-112 (terminal
No. 2) oxygen sensor (front) connector and C-137
(terminal No. 92) engine-ECU connector.

œ

Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair.

STEP 6. MUT-II data list

œ

Refer to Data list reference table

3

13A

 .

a. Item 11: Oxygen sensor (front)

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

NO :

Replace engine-ECU.

STEP 7. Measure at B-112 oxygen sensor (front)
connector.

œ

Use special tool test harness (MD998464) to con-
nect connector, and measure at pick-up harness.

œ

Engine: After warm-up

œ

Ignition switch: ON

œ

Voltage between terminal No. 2 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Go to Step 8 .

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-64

STEP 8. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Check and repair harness between B-112

(terminal No. 2) oxygen sensor (front)
connector and C-137 (terminal No. 92)
engine-ECU connector.

œ

Check earthing line for damage.

NO :

Repair.

STEP 9. Measure voltage at B-112 oxygen sensor
(front) connector.

œ

Use special tool test harness (MD998464) to con-
nect connector, and measure at pick-up harness.

œ

Engine: After warm-up

œ

Voltage between terminal No. 4 and earth.

OK:

600

-

1,000 mV when 200 mV or lower abrupt

racing is done a few seconds after abrupt
deceleration from 4,000 r/min.

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Go to Step 10 .

STEP 10. Check oxygen sensor itself

œ

Check oxygen sensor (front) itself (Refer to

3

13A

).

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Replace oxygen (front) sensor.

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-65

STEP 11. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Check and repair harness between B-112

(terminal No. 4) oxygen sensor (front)
connector and C-137 (terminal No. 76)
engine-ECU connector.

œ

Check output line for damage.

NO :

Repair.

STEP 12. Measure voltage at C-137 engine-ECU
connector.

œ

Measure engine-ECU terminal voltage.

œ

Transmission: Neutral

œ

Engine: After warm-up

œ

Voltage between terminal No. 76 and earth.

OK:

600

-

1,000 mV when 200 mV or lower abrupt

racing is done a few seconds after abrupt
deceleration from 4,000 r/min.

Q: Is the check result normal?

YES :

Go to Step 14 .

NO :

Go to Step 13 .

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-66

STEP 13. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Check and repair harness between B-112

(terminal No. 4) oxygen sensor (front)
connector and C-137 (terminal No. 76)
engine-ECU connector.

œ

Check output line for open circuit.

NO :

Repair.

STEP 14. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair.

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector