Mitsubishi L200. Manual - part 61

 

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Mitsubishi L200. Manual - part 61

 

 

TROUBLESHOOTING

DIESEL FUEL

13A-40

FUNCTION

• The variable geometry control solenoid valve 

controls the vacuum pressure introduced into the 
variable geometry actuator, using the signal from 
the engine-ECU. This allows the boost pressure 
to be adequate for the driving conditions.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V.

• 2 seconds later after the engine has started up.

Judgment Criterion

• Variable geometry control solenoid valve output 

voltage is 4.5 V or more (driving current is abnor-
mally high).

PROBABLE CAUSES

• Short circuit in variable geometry control solenoid 

valve circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-56 variable 
geometry control solenoid valve connector, C-
105 engine-ECU connector

Q: Are the check results normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

AK900982

2 1

AC

A-56 (BR)

Harness side
connector

Connector: A-56

AKA00089

1

2

3

4

5

6

7

8

9

10

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12

13

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16

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18

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25

26

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31

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34

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39

40

41

42

49

50

51

52

53

54

55

56

57

58

59

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61

62

63

64

65

66

67

68

69

70

71

72

43

44

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46

47

48

73

74

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77

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79

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85

86

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89

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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-41

STEP 2. Check harness between A-56 (terminal 
No. 1) variable geometry control solenoid valve 
connector and C-105 (terminal No. 17) engine-
ECU connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair the damaged harness wire.

STEP 3. M.U.T.-III diagnosis code 

• Reconfirmation of diagnosis code.

Q: Is 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 ).

AK900982

2 1

AC

A-56 (BR)

Harness side
connector

Connector: A-56

AKA00089

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

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33

34

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36

37

38

39

40

41

42

49

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51

52

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54

55

56

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58

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61

62

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64

65

66

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70

71

72

43

44

45

46

47

48

73

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76

77

78

79

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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-42

Code No. P0072: Intake Air Temperature Sensor No. 1 Circuit Low Input <Euro5>

OPERATION

• A power voltage of 5 V is applied to the intake air 

temperature sensor No. 1 output terminal (termi-
nal No. 2) from the engine-ECU (terminal No. 62).

• The power voltage is earthed to the engine-ECU 

(terminal No. 86) from the intake air temperature 
sensor No. 1 (terminal No. 1).

FUNCTION

• The intake air temperature sensor No. 1 converts 

the intake air 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 intake air temperature sensor No. 1 is a kind 

of resistor, which has characteristics to reduce its 
resistance as the intake air temperature rises. 
Therefore, the sensor output voltage varies with 
the intake air temperature, and becomes lower as 
the intake air 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 intake air temperature sensor No. 1 output 

voltage is 0.09 V or less for 0.5 second.

PROBABLE CAUSES

• Failed intake air temperature sensor No. 1

• Short circuit or harness damage in intake air tem-

perature sensor No.1 circuit or loose connector 
contact

• Failed engine-ECU

AKA00356

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

5

4

3

2

1

86

62

Intake air temperature 
sensor No. 1 (integrated in
air flow sensor)

Engine-ECU 

1

2

Intake Air Temperature Sensor No. 1 Circuit

B-L

Y-L

A-135

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: Gray
R: Red  P: Pink  V: Violet  PU: Purple  SI: Silver

5 V

AB

TROUBLESHOOTING

DIESEL FUEL

13A-43

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 43: Intake air temperature sensor No. 1

OK: At ambient temperature (atmospheric 
temperature) 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-135 air flow sensor 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check intake air temperature sensor No. 
1 itself.

• Check intake air temperature sensor No. 1 itself 

(Refer to 

P.13A-595

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the air flow sensor.

STEP 4. Perform Voltage measurement at A-135 
air flow sensor 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 .

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.

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

AKA00399

AB

Harness side 
connector

A-135 (B)

Connector: A-135

AKA00089

1

2

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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

 

 

 

 

 

 

 

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