Mitsubishi Outlander (2003+). Manual — part 44

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-39

STEP 16. Connector check: C-135 engine-ECU
connector

Q: Is the check result normal?

YES :

Check intermediate connector C-16 and

repair if necessary. If intermediate
connector is normal, check and repair
harness between B-08 (terminal No. 5) air
flow sensor connector and C-135 (terminal
No. 40) engine-ECU connector.

œ

Check earthing line for damage.

NO :

Repair.

AK300256

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

AB

CONNECTOR: C-135

C-135

Harness side connector

AK300253

3

4

5

1

2

6

7

AB

Harness side connector

B-08 (B)

Connector: B-08

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-40

Code No. P0115: Engine Coolant Temperature Sensor System

OPERATION

œ

A power voltage of 5 V is applied to the engine
coolant temperature sensor output terminal (ter-
minal No. 1) from the engine-ECU (terminal No.
83).

œ

The power voltage is earthed to the engine-ECU
(terminal No. 92) from the engine coolant temper-
ature sensor (terminal No. 2).

FUNCTION

œ

The engine coolant temperature sensor converts
the engine coolant temperature into a voltage sig-
nal, and inputs the voltage to the engine-ECU.

œ

In response to the signal, the engine-ECU con-
trols the fuel infection amount and the fast idle
speed when the engine is cold state.

œ

The engine coolant temperature sensor is a kind
of resistor, which has characteristics to reduce its
resistance as the engine coolant temperature
rises. Therefore, the sensor output voltage varies
with the engine coolant temperature, and
becomes lower as the engine coolant tempera-
ture rises.

TROUBLE JUDGMENT

Check Condition

œ

2 seconds later after the ignition switch has been
in "ON" position or just after the engine has
started up.

Judgment Criterion

œ

The sensor output voltage is 4.6 V or more (water
temperature of below

-

45

•

C or equivalent) for 2

seconds.

Or

œ

The sensor output voltage of 0.1 V or less (water
temperature of above 140

•

C or equivalent) for 2

seconds.

AK300260

1 2

5V

82

78

81

80

89 90 9192

79

87

71

74

73

72

76

75

77

85

88

83 84

86

AB

92

83

BR

Y-G

Engine-ECU

Engine coolant temperature sensor

B-108
(MU802406)

2

1

Engine coolant temperature sensor circuit

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-41

Check Condition

œ

After the engine has started up.

Judging Conditions

œ

The sensor output voltage rises 1.6 V or more
(engine coolant temperature below 40

•

C or

equivalent) from 1.6 V or less (engine coolant
temperature above 40

•

C or equivalent).

PROBABLE CAUSE

œ

Failed engine coolant temperature sensor

œ

Open/short circuit in engine coolant temperature
sensor circuit or loose connector contact

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II data list

œ

Refer to Data list reference table

3

13A

 .

a. Item 21: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature

(atmospheric temperature) or equivalent.

Engine hot state: At 80

-

120

•

C

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: B-108 engine coolant
temperature sensor connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair.

STEP 3. Measure resistance at B-108 engine
coolant temperature sensor connector.

œ

Disconnect connector, and measure at sensor
side.

œ

Resistance between terminal No. 1 and No. 2.

OK:

Engine coolant temperature at

-

20

•

C: 14

-

17

k

W

Engine coolant temperature at 0

•

C: 5.1

-

6.5

k

W

Engine coolant temperature at 20

•

C: 2.1

-

2.7

k

W

Engine coolant temperature at 40

•

C: 0.9

-

1.3

k

W

Engine coolant temperature at 60

•

C: 0.48

-

0.68 k

W

Engine coolant temperature at 80

•

C: 0.26

-

0.36 k

W

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace engine coolant temperature
sensor.

AK300261

1

2

Harness side
connector

B-108 (B)

AB

Connector: B-108

AK300261

1

2

Harness side
connector

B-108 (B)

AB

Connector: B-108

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-42

STEP 4. Measure voltage at B-108 engine coolant
temperature sensor connector.

œ

Disconnect connector, and measure at harness
side.

œ

Ignition switch: ON

œ

Voltage between terminal No. 1 and earth.

OK: 4.5

-

4.9 V

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Go to Step 5 .

STEP 5. Measure voltage at C-137 engine-ECU
connector.

œ

Measure engine-ECU terminal voltage.

œ

Disconnect B-108 engine coolant temperature
sensor.

œ

Ignition switch: ON

œ

Voltage between terminal No. 83 and earth.

OK: 4.5

-

4.9 V

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Go to Step 7 .

AK300261

1

2

Harness side
connector

B-108 (B)

AB

Connector: B-108

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

AK300261

1

2

Harness side
connector

B-108 (B)

AB

Connector: B-108