Mitsubishi Outlander (2003+). Manual — part 52

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-71

STEP 10. Check harness between B-112 (terminal
No. 3) oxygen sensor (front) connector and C-136
(terminal No. 60) engine-ECU connector.

œ

Check earthing line for damage.

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Repair.

STEP 11. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

AK300264

1

2

3

4

AB

B-112 (B)

Harness side connector

Oxygen sensor (front)

Connector: B-112

AK300268

58

60

61

53 52 51

55 54

56

59

62

57

AB

CONNECTOR: C-136

C-136

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-72

Code No. P0136: Oxygen Sensor (Rear) System <Sensor 2>

OPERATION

œ

The sensor signal is inputted to the engine-ECU
(terminal No. 75) from the oxygen sensor (rear)
output terminal (terminal No. 4).

œ

The oxygen sensor (rear) (terminal No. 3) is
earthed with engine-ECU (terminal No. 92).

FUNCTION

œ

The oxygen sensor (rear) converts the concentra-
tion of oxygen in the exhaust emission into a volt-
age signal and inputs the voltage signal to the
engine-ECU.

œ

When the air-fuel ratio is richer than the theoreti-
cal air-fuel ratio, the oxygen sensor (rear) outputs
a voltage of about 1 V. When it is leaner than the
theoretical air-fuel ratio, it outputs a voltage of
about 0 V.

œ

In response to the signal, the engine-ECU con-
trols the fuel infection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.

TROUBLE JUDGMENT

Check Conditions

œ

Above 3 minutes later after the engine has
started up.

œ

The engine coolant temperature is approximately.
82

•

C or higher.

œ

The engine speed is 1,200 r/min or more.

œ

The volumetric efficiency is 25% or more.

œ

The monitoring time is 5 seconds.

Judgment Criteria

œ

When the oxygen sensor (rear) output voltage is
0.2 V or less and a power voltage of 5 V is
applied to the oxygen sensor (rear) in the engine-
ECU, the sensor output voltage is 4.5 V or more.

PROBABLE CAUSE

œ

Failed oxygen sensor

œ

Open/short circuit in oxygen sensor (rear) circuit
or loose connector contact

œ

Failed engine-ECU

AK300269

1 2

3 4

82

78

81

80

89 90 9192

79

87

71

74

73

72

76

75

77

85

88

83 84

86

AB

C-18

(MU801688)

Engine-ECU

Oxygen sensor (rear)

From engine control relay

To engine-ECU

2

3

P

L

B

B

1

4

92

75

Oxygen sensor (rear) circuit

3

1

J/C (2)
C-17

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V:Violet

C-137

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-73

DIAGNOSIS PROCEDURE

STEP 1. MUT-II data list

œ

Refer to Data list reference table

3

13A

 .

a. Item 59: Oxygen sensor (rear)

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

NO :

Go to Step 2 .

STEP 2. Connector check: C-18 oxygen sensor
(rear) connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair.

STEP 3. Measure voltage at C-18 oxygen sensor
(rear) connector.

œ

Disconnect connector, and measure at harness
side.

œ

Resistance between terminal No. 3 and earth.

OK: 2

W

or less

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 4 .

STEP 4. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair.

AK300270

1 2

3 4

AB

Connector: C-18

Oxygen sensor (rear)

C-18

Harness side
connector

AK300270

1 2

3 4

AB

Connector: C-18

Oxygen sensor (rear)

C-18

Harness side
connector

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-74

STEP 5. Check harness between C-18 (terminal
No. 3) oxygen sensor (rear) 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 59: Oxygen sensor (rear)

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 voltage at C-18 oxygen sensor
(rear) connector.

œ

Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.

œ

Engine: After warm-up

œ

Ignition switch: ON

œ

Voltage between terminal No. 3 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Go to Step 8 .

AK300270

1 2

3 4

AB

Connector: C-18

Oxygen sensor (rear)

C-18

Harness side
connector

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

AK300270

1 2

3 4

AB

Connector: C-18

Oxygen sensor (rear)

C-18

Harness side
connector