Mitsubishi L200. Manual - part 108

 

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Mitsubishi L200. Manual - part 108

 

 

TROUBLESHOOTING

DIESEL FUEL

13A-228

STEP 5. Check harness between A-45 (terminal 
No. 2) EGR valve assembly connector and C-105 
(terminal No. 81) engine-ECU connector.

• Check earthing line for open 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 16: EGR valve 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 ).

STEP 7. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 16: EGR valve 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 EGR valve assembly.

Code No. P0420: Catalyst Malfunction <Euro5>

FUNCTION

• The engine-ECU injects the fuel with the slower 

timing than usual (post injection), so that the oxy-
gen and HC of exhaust gas burn in the catalyst, 
and the exhaust gas temperature raises up to the 
level which enables the DPF regeneration.

• The engine-ECU monitors the signals from the 

No. 2 exhaust gas temperature sensor (catalyst 
temperature) to detect the catalyst inactivation.

TROUBLE JUDGMENT

Check Condition

• On DPF regeneration

Judgement Criteria

• The conditions below continues for 30 seconds.

• The fuel injection amount exceeds the specified 

value.

• The engine speed exceeds the specified value.

AK501331

1

2

3

4

5

6

AB

Harness side 
connector

A-45 (GR)

Connector: A-45

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

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23

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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-229

• The No. 1 exhaust gas temperature sensor is 

350

°C or higher.

• The No. 2 exhaust gas temperature sensor (cata-

lyst temperature) is 450

°C or below.

PROBABLE CAUSES

• Failed No. 1 exhaust gas temperature sensor

• Failed No. 2 exhaust gas temperature sensor 

(catalyst temperature)

• Catalytic converter inactive

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list.

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 117: No. 1 exhaust gas temperature sen-

sor

b. Item 118: No. 2 exhaust gas temperature sen-

sor (catalyst temperature)

Q: Are the check results normal?

YES : 

Go to Step 2 .

NO : 

Perform the diagnosis code classified check 
procedure for the sensor that has shown an 
abnormal data value (Refer to Inspection 
Chart for Diagnosis Code 

P.13A-21

).

STEP 2. Forcible DPF regeneration execution

• Initialise the DPF-related parts, and then delete 

the diagnosis code (Refer to GROUP 00 

− Pre-

cautions before Service 

− Initialisation Procedure 

for Learning Value in Diesel Particulate Filter 
(DPF) System ).

a. Item 42: DPF system malfunction service

• Carry out the forcible DPF regeneration (Refer to 

GROUP 17 

− Emission Control − Diesel Particu-

late Filter (DPF) System 

− Forcible DPF Regen-

eration ).

Q: Is the diagnosis code P0420 or P1497 output?

YES : 

 Replace the catalytic converter. When the 

catalytic converter is replaced, initialise the 
learning value. (Refer to GROUP 00 

− 

Precautions before Service 

− Initialisation 

Procedure for Learning Value in Diesel 
Particulate Filter (DPF) System .) On 
completion, carry out the forcible DPF 
regeneration (Refer to GROUP 17 

− 

Emission Control 

− Diesel Particulate Filter 

(DPF) System 

− Forcible DPF Regeneration 

).

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 ).

TROUBLESHOOTING

DIESEL FUEL

13A-230

Code No. P0427: No. 2 Exhaust Gas Temperature Sensor (catalyst temperature) Circuit Low Input 
<Euro5>

OPERATION

• A power voltage of 5 V is applied to the No. 2 

exhaust gas temperature sensor (catalyst tem-
perature) output terminal (terminal No. 1) from 
the engine-ECU (terminal No. 59).

• The power voltage is earthed to the engine-ECU 

(terminal No. 83) from the No. 2 exhaust gas tem-
perature sensor (catalyst temperature) (terminal 
No. 2).

FUNCTION

• The No. 2 exhaust gas temperature sensor (cata-

lyst temperature) converts the catalyst tempera-
ture into a voltage and inputs the voltage signal to 
the engine-ECU.

• Engine-ECU uses this voltage output for DPF 

regeneration control.

• The No. 2 exhaust gas temperature sensor (cata-

lyst temperature) is a kind of resistor, which has 
characteristics to reduce its resistance as the cat-
alyst temperature rises. Therefore, the sensor 
output voltage varies with the catalyst tempera-
ture, and becomes lower as the catalyst tempera-
ture 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. 2 exhaust gas temperature sensor (cata-

lyst temperature) output voltage is 0.255 V or 
less.

AKB00271

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

BR-G

O-B

R-B

GR-R

Engine-ECU

No. 2 exhaust gas
temperature sensor
(catalyst temperature)

A-159

MU802601

No. 2 Exhaust Gas Temperature Sensor (catalyst temperature) Circuit

2

83

1

2

8

59

A-28

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-231

PROBABLE CAUSES

• Failed No. 2 exhaust gas temperature sensor 

(catalyst temperature)

• Short circuit in No. 2 exhaust gas temperature 

sensor (catalyst temperature) circuit or loose con-
nector 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 118: No. 2 exhaust gas temperature sensor 

(catalyst 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-159 No. 2 exhaust 
gas temperature sensor (catalyst temperature) 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check No. 2 exhaust gas temperature 
sensor (catalyst temperature) itself.

• Check No. 2 exhaust gas temperature sensor 

(catalyst temperature) itself (Refer to GROUP 17 
− Emission Control − Diesel Particulate Filter 
(DPF) System 

− No. 2 Exhaust Gas Temperature 

Sensor (catalyst temperature) Check ).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the No. 2 exhaust gas temperature 
sensor (catalyst temperature). After 
replacing the No. 2 exhaust gas 
temperature sensor (catalyst 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.

1

2

AKB00272

A-159 (B)

Harness side
connector

Connector: A-159

No. 2 exhaust gas
temperature sensor
(catalyst temperature)

AB

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

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22

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24

25

26

27

28

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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

 

 

 

 

 

 

 

Content   ..  106  107  108  109   ..