Mitsubishi L200. Manual — part 84
TROUBLESHOOTING
DIESEL FUEL
13A-132
STEP 5. Check harness between A-132 (terminal
No. 4) electronic-controlled throttle valve
connector and C-105 (terminal No. 34) engine-
ECU connector.
• Check earthing line for open circuit and damage.
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
.
a. Item 45: Throttle 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 ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
STEP 7. Replace the electronic-controlled
throttle valve assembly
• After replacing the electronic-controlled throttle
valve assembly, re-check the trouble symptoms.
Q: Is the check result normal?
YES :
Check end.
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,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
AK604705
1
6 5 4 3 2
AB
A-132 (B)
Connector: A-132
Harness side
connector
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-133
Code No. P0182: Fuel Temperature Sensor Circuit Low input
OPERATION
• A power voltage of 5 V is applied to the fuel tem-
perature sensor output terminal (terminal No. 1)
from the engine-ECU (terminal No. 55).
• The power voltage is earthed to the engine-ECU
(terminal No. 79) from the fuel temperature sen-
sor (terminal No. 2).
FUNCTION
• The fuel temperature sensor converts the fuel
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 fuel temperature sensor is a kind of resistor,
which has characteristics to reduce its resistance
as the fuel temperature rises. Therefore, the sen-
sor output voltage varies with the fuel tempera-
ture, and becomes lower as the fuel 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 fuel temperature sensor output voltage is
0.10 V or less for 0.5 second.
PROBABLE CAUSES
• Failed fuel temperature sensor
• Short circuit or harness damage in fuel tempera-
ture sensor circuit or loose connector contact
• Failed engine-ECU
AKA00097
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
79
55
Fuel temperature sensor
Engine-ECU
2
1
Fuel Temperature Sensor Circuit
BR
Y-B
A-46
(MU802406)
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
5 V
TROUBLESHOOTING
DIESEL FUEL
13A-134
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 21: Fuel temperature sensor
OK: At ambient temperature (fuel tempera-
ture) 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-46 fuel temperature
sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check fuel temperature sensor itself.
• Check fuel temperature sensor itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the fuel temperature sensor.
STEP 4. Perform voltage measurement at A-46
fuel temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 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.
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
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-135
STEP 6. Check harness between A-46 (terminal
No. 1) fuel temperature sensor connector and C-
105 (terminal No. 55) 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 21: Fuel temperature sensor
OK: At ambient temperature (fuel tempera-
ture) 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,
the vehicle equipped with the DPF carries
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-46
fuel temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 2 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Go to Step 9 .
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
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
AK501326
1
2
AB
A-46 (B)
Harness side
connector
Connector: A-46
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