Mitsubishi L200. Manual — part 128

TROUBLESHOOTING

DIESEL FUEL

13A-308

Judgment Criterion

• Actual boost pressure is lower than target boost

pressure by less than 6.7 kPa

PROBABLE CAUSES

• Failed variable geometry turbocharger control

system

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Check the turbocharger supercharging
pressure.

• Check the turbocharger supercharging pressure

(refer to GROUP 15

− On-vehicle Service − Tur-

bocharger Supercharging Pressure Check ).

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair the variable geometry turbocharger
control system.

STEP 2. M.U.T.-III diagnosis code.

• After clearing the diagnosis code through M.U.T.-

III, start the engine and confirm whether the diag-
nosis code is output.

Q: Is the diagnosis code set?

YES :

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 ).

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/

Inspection Service Points

− How to Cope

with Intermittent Malfunctions ).

TROUBLESHOOTING

DIESEL FUEL

13A-309

Code No. P1427: No. 3 Exhaust Gas Temperature Sensor (DPF temperature) Circuit Low 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 output for DPF

regeneration 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.

Judgment Criterion

• The No. 3 exhaust gas temperature sensor (DPF

temperature) output voltage is 0.255 V or less.

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

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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-310

• Short circuit in No. 3 exhaust gas temperature

sensor (DPF temperature) circuit or connector
damage

• 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. Connector check: C-105 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair or replace the connector.

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

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8

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83

84

85

86

87

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89

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91

92

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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-311

STEP 5. 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 short circuit.

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 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 ).

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

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61

62

63

64

65

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71

72

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47

48

73

74

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76

77

78

79

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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