Mitsubishi L200. Manual - part 84

TROUBLESHOOTING

DIESEL FUEL

13A-132

STEP 5. Check harness between A-132 (terminal 
No. 4) electronic-controlled throttle valve 
connector and C-105 (terminal No. 34) engine-
ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 45: Throttle position sensor

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

NO : 

Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ). After 
registering the injector identification code, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

STEP 7. Replace the electronic-controlled 
throttle valve assembly

• After replacing the electronic-controlled throttle 

valve assembly, re-check the trouble symptoms.

Q: Is the check result normal?

YES : 

Check end.

NO : 

Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ). After 
registering the injector identification code, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

AK604705

1

6 5 4 3 2

AB

A-132 (B)

Connector: A-132

Harness side 
connector

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

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49

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52

53

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55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

43

44

45

46

47

48

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

TROUBLESHOOTING

DIESEL FUEL

13A-133

Code No. P0182: Fuel Temperature Sensor Circuit Low input

OPERATION

• A power voltage of 5 V is applied to the fuel tem-

perature sensor output terminal (terminal No. 1) 
from the engine-ECU (terminal No. 55).

• The power voltage is earthed to the engine-ECU 

(terminal No. 79) from the fuel temperature sen-
sor (terminal No. 2).

FUNCTION

• The fuel temperature sensor converts the fuel 

temperature into a voltage and inputs the voltage 
signal to the engine-ECU.

• In response to the signal, the engine-ECU cor-

rects the fuel injection amount, etc.

• The fuel temperature sensor is a kind of resistor, 

which has characteristics to reduce its resistance 
as the fuel temperature rises. Therefore, the sen-
sor output voltage varies with the fuel tempera-
ture, and becomes lower as the fuel temperature 
rises.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been 

in "ON" position or the engine has started up.

Judgment Criterion

• The fuel temperature sensor output voltage is 

0.10 V or less for 0.5 second.

PROBABLE CAUSES

• Failed fuel temperature sensor

• Short circuit or harness damage in fuel tempera-

ture sensor circuit or loose connector contact

• Failed engine-ECU

AKA00097

1 2

1

2

3

4

5 6 7 8 9

10 1112 13 14 15 16 17 18 19 20 21 22 23 24

25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

43 44 45 46 47 48

73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

AB

79

55

Fuel temperature sensor

Engine-ECU 

2

1

Fuel Temperature Sensor Circuit

BR

Y-B

A-46

(MU802406)

C-105

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

  SI: Silver

5 V

TROUBLESHOOTING

DIESEL FUEL

13A-134

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 21: Fuel temperature sensor

OK: At ambient temperature (fuel tempera-
ture) or equivalent.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

NO : 

Go to Step 2 .

STEP 2. Connector check: A-46 fuel temperature 
sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check fuel temperature sensor itself.

• Check fuel temperature sensor itself (Refer to 

P.13A-596

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the fuel temperature sensor.

STEP 4. Perform voltage measurement at A-46 
fuel temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 5 .

STEP 5. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

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66

67

68

69

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71

72

43

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45

46

47

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73

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79

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81

82

83

84

85

86

87

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89

90

91

92

93

94

95

96

C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

TROUBLESHOOTING

DIESEL FUEL

13A-135

STEP 6. Check harness between A-46 (terminal 
No. 1) fuel temperature sensor connector and C-
105 (terminal No. 55) engine-ECU connector.

• Check output line for short circuit.

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. M.U.T.-III data list

• Item 21: Fuel temperature sensor

OK: At ambient temperature (fuel tempera-
ture) or equivalent.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

NO : 

Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ). After 
registering the injector identification code, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

STEP 8. Perform resistance measurement at A-46 
fuel temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 9 .

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

43

44

45

46

47

48

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AK501326

1

2

AB

A-46 (B)

Harness side 
connector

Connector: A-46