Mitsubishi L200. Manual — part 70
TROUBLESHOOTING
DIESEL FUEL
13A-76
STEP 5. Check harness between A-135 (terminal
No. 4) air flow sensor connector and C-103
(terminal No. 155) 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
.
a. Item 114: Air flow 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. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 114: Air flow 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 air flow sensor.
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
146
147
148
149
150
151
152
153
154
155
156
157
158
117
145
116
144
C-103 (B)
C-103 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-103
AB
TROUBLESHOOTING
DIESEL FUEL
13A-77
Code No. P0106: Manifold Absolute Pressure Sensor Range/Performance Problem
OPERATION
• A power voltage of 5 V is applied to the manifold
absolute pressure sensor power terminal (termi-
nal No. 1) from the engine-ECU (terminal No. 72)
and earthed to the engine-ECU (terminal No. 31)
from the manifold absolute pressure sensor (ter-
minal No. 3).
• The sensor signal is inputted to the engine-ECU
(terminal No. 37) from the manifold absolute
pressure sensor output terminal (terminal No. 2).
FUNCTION
• The manifold absolute pressure sensor converts
the manifold absolute pressure into a voltage sig-
nal and inputs the signal to the engine-ECU.
• In response to the signal, the engine-ECU cor-
rects the fuel injection amount, etc.
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.
• The following 3 conditions are formed:
1. The engine cooling water temperature is from
−5 to 80 °C.
2. The air intake temperature is from
−5 to 80
°C.
3. The atmospheric pressure is from 76 to 120
kPa.
Judgment Criterion
• When an idle state and an engine rotation speed
of 2,000 r/min continue for three seconds, mani-
fold absolute pressures are read and the differ-
ence between them goes under 800 Pa for 1
second.
PROBABLE CAUSES
• Failed manifold absolute pressure sensor
• Manifold absolute pressure sensor circuit har-
ness damage or loose connector contact.
• EGR cooler clogged.
• EGR pipe (A, B) clogged.
• Failed engine-ECU
AKA00093
3
2
1
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
Engine-ECU
31
LG-B
G-L
GR
37
72
A-105
Manifold
absolute
pressure
sensor
3
2
1
Manifold Absolute Pressure Sensor Circuit
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
C-105
5 V
AB
TROUBLESHOOTING
DIESEL FUEL
13A-78
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 6: Manifold absolute pressure sensor
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Go to Step 2.
STEP 2. Connector check: A-105 manifold
absolute pressure sensor connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace the connector.
STEP 3. Perform voltage measurement at A-105
manifold absolute pressure sensor connector.
• Use special tool test harness (MB991709) to con-
nect connector, and measure at pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: 4.9
− 5.1 V
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
STEP 4. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-105
(terminal No. 1) manifold absolute pressure
sensor connector and C-105 (terminal No.
72) engine-ECU connector.
• Check power supply line for damage.
NO :
Repair or replace the connector.
AK900797
1
3 2
AB
Harness side
connector
A-105 (L)
Connector: A-105
AK900797
1
3 2
AB
Harness side
connector
A-105 (L)
Connector: A-105
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
AK900797
1
3 2
AB
Harness side
connector
A-105 (L)
Connector: A-105
TROUBLESHOOTING
DIESEL FUEL
13A-79
STEP 5. Perform voltage measurement at A-105
manifold absolute pressure sensor connector.
• Use special tool harness (MB991709) to connect
connector, and measure at pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
STEP 6. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-105
(terminal No. 3) manifold absolute pressure
sensor connector and C-105 (terminal No.
31) engine-ECU connector.
• Check earthing line for damage.
NO :
Repair or replace the connector.
AK900797
1
3 2
AB
Harness side
connector
A-105 (L)
Connector: A-105
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
AK900797
1
3 2
AB
Harness side
connector
A-105 (L)
Connector: A-105
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