Mitsubishi L200. Manual — part 62
TROUBLESHOOTING
DIESEL FUEL
13A-44
STEP 6. Check harness between A-135 (terminal
No. 2) air flow sensor connector and C-105
(terminal No. 62) 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 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 :
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-
135 air flow sensor 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 .
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00089
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95
96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
TROUBLESHOOTING
DIESEL FUEL
13A-45
STEP 9. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace the connector.
STEP 10. Check harness between A-135 (terminal
No. 1) air flow sensor connector and C-105
(terminal No. 86) engine-ECU connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
AKA00089
1
2
3
4
5
6
7
8
9
10
11
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86
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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
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
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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-46
STEP 11. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Repair or replace the connector.
STEP 12. Check harness between A-135 (terminal
No. 2) air flow sensor connector and C-105
(terminal No. 62) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the damaged harness wire.
AKA00089
1
2
3
4
5
6
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10
11
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72
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79
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82
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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
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
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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-47
Code No. P0072: Intake Air Temperature Sensor No. 2 Circuit Low Input <Except Euro5>
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor No. 2 output terminal (termi-
nal No. 1) from the engine-ECU (terminal No. 38).
• The power voltage is earthed to the engine-ECU
(terminal No. 32) from the intake air temperature
sensor (terminal No. 2).
FUNCTION
• The intake air temperature sensor No. 2 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. 2 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 fuel 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. 2 output
voltage is 0.05 V or less (the intake air tempera-
ture is above 150
°C or equivalent) for 0.5 second.
PROBABLE CAUSES
• Failed intake air temperature sensor No. 2
• Short circuit or harness damage in intake air tem-
perature sensor No. 2 circuit or loose connector
contact
• Failed engine-ECU
AKA00091
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
32
38
Intake air temperature
sensor No. 2
Engine-ECU
2
1
Intake Air Temperature Sensor No. 2 Circuit
B-P
L-R
A-136
(MU802409)
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
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