Mitsubishi L200. Manual - part 129

TROUBLESHOOTING

DIESEL FUEL

13A-312

Code No. P1428: No. 3 Exhaust Gas Temperature Sensor (DPF temperature) Circuit High Input 
<Euro5>

OPERATION

• A power voltage of 5 V is applied to the No. 3 

exhaust gas temperature sensor (DPF tempera-
ture) output terminal (terminal No. 2) from the 
engine-ECU (terminal No. 60).

• The power voltage is earthed to the engine-ECU 

(terminal No. 84) from the No. 3 exhaust gas tem-
perature sensor (DPF temperature) (terminal No. 
1).

FUNCTION

• The No. 3 exhaust gas temperature sensor (DPF 

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

• Engine-ECU uses this voltage for DPF regenera-

tion control.

• The No. 3 exhaust gas temperature sensor (DPF 

temperature) is a kind of resistor, which has char-
acteristics to reduce its resistance as the DPF 
temperature rises. Therefore, the sensor output 
voltage varies with the DPF temperature, and 
becomes lower as the DPF 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.

• Vehicle speed is 20 km/h or higher.

Judgment Criterion

• The No. 3 exhaust gas temperature sensor (DPF 

temperature) output voltage is 4.95 V or more.

PROBABLE CAUSES

• Failed No. 3 exhaust gas temperature sensor 

(DPF temperature)

AKB00277

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

1 2

AB

B

W

W-V

BR-G

Engine-ECU

No. 3 exhaust gas
temperature sensor
(DPF temperature)

A-158

MU802661

No. 3 Exhaust Gas Temperature Sensor (DPF temperature) Circuit

1

6

84

2

A-28

12

60

5 V

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

TROUBLESHOOTING

DIESEL FUEL

13A-313

• Open circuit or harness damage in No. 3 exhaust 

gas temperature sensor (DPF temperature) cir-
cuit or loose connector contact

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

a. Item 119: No. 3 exhaust gas temperature sensor 

(DPF temperature)

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-158 No. 3 exhaust 
gas temperature sensor (DPF temperature) 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check No. 3 exhaust gas temperature 
sensor (DPF temperature) itself.

• Check No. 3 exhaust gas temperature sensor 

(DPF temperature) itself (Refer to GROUP 17 

− 

Emission Control 

− Diesel Particulate Filter (DPF) 

System 

− No. 3 exhaust gas temperature sensor 

(DPF temperature) Check ).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the No. 3 exhaust gas temperature 
sensor (DPF temperature). After replacing 
the No. 3 exhaust gas temperature sensor 
(DPF temperature), carry out the forcible 
DPF regeneration. (Refer to GROUP 17 

− 

Emission Control 

− Diesel Particulate Filter 

(DPF) System 

− Forcible DPF Regeneration 

).

STEP 4. Perform voltage measurement at A-158 
No. 3 exhaust gas temperature sensor (DPF 
temperature) connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 2 and earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 5 .

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

TROUBLESHOOTING

DIESEL FUEL

13A-314

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.

STEP 6. Check harness between A-158 (terminal 
No. 2) No. 3 exhaust gas temperature sensor 
(DPF temperature) connector and C-105 (terminal 
No. 60) engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connector A-28, and repair if necessary.

• Check output line for open circuit.

Q: Is the check result normal?

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

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)

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

TROUBLESHOOTING

DIESEL FUEL

13A-315

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

a. Item 119: No. 3 exhaust gas temperature sensor 

(DPF temperature)

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, 
carry 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-
158 No. 3 exhaust gas temperature sensor (DPF 
temperature) connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 1 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 9 .

AKB00278

1

2

A-158 (B)

Connector: A-158

AB

Harness side
connector

No. 3 exhaust gas
temperature sensor
(DPF temperature)