Mitsubishi L200. Manual — part 174
TROUBLESHOOTING
DIESEL FUEL
13A-492
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,
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 ).
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunction ).
Inspection Procedure 17: Engine-ECU Battery Back-up System
OPERATION
• Backup power source is directly supplied to an
engine-ECU from a battery.
AKA00116
101 102
103104 105 106107 108109 110 111112 113 114115
118119 120 121122 123124 125126127 128 129130
131132 133 134135 136137 138139140 141142 143
146147 148 149150 151152 153154155 156 157158
117
145
116
144
C-103
10
20A
Fusible link
103
Battery
backup
3
A-115
Relay
box
W-R
W-B
W-B
Battery back-up 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
Engine-ECU
23
AB
TROUBLESHOOTING
DIESEL FUEL
13A-493
PROBABLE CAUSES
• Damaged harness (Open circuit between engine-
ECU and relay box)
• Damaged connector (Engine-ECU connector)
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check battery voltage.
• Measure battery voltage during cranking.
OK: 8 V or more
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Check battery (Refer to GROUP 54A
−
Battery
− On-vehicle Service − Battery test
).
STEP 2. Perform voltage measurement at C-103
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Voltage between terminal No. 103 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 3 .
STEP 3. Connector check: C-103 engine-ECU
connector and A-115 intermediate connector.
Q: Are the check results normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
AKA00090
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102
103
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153
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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
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
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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
AK700922
1 2
3
6 7 8
4
5
9 10
AB
A-115
Harness side connector
A-115
Connector: A-115
<L.H. drive vehicles>
<R.H. drive vehicles>
TROUBLESHOOTING
DIESEL FUEL
13A-494
STEP 4. Check for open circuit between C-103
(terminal No. 103) engine-ECU connector and A-
115 (terminal No. 3) intermediate connector.
• Disconnect connector.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair the harness wire.
STEP 5. Check the trouble symptoms.
Q: Does trouble symptom persist?
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,
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 ).
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunction ).
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
AK700922
1 2
3
6 7 8
4
5
9 10
AB
A-115
Harness side connector
A-115
Connector: A-115
<L.H. drive vehicles>
<R.H. drive vehicles>
TROUBLESHOOTING
DIESEL FUEL
13A-495
Inspection Procedure 18: 1st and 2nd Rail Switch System <M/T>
OPERATION
• The 1st and 2nd rail switches detect that a trans-
mission is shifted into the 1st speed gear posi-
tion.
• An engine-ECU controls an engine speed to be 3,
000 r/min or less so that an excessive load can-
not be applied to a drive train system due to a
sudden start in the first gear position.
PROBABLE CAUSES
• Failed 1st and 2nd rail switch
AKB00289
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
2
1
Ignition switch (IG1)
11
L-B
L-Y
L-Y
G-Y
G-Y
G-Y
1st and 2nd Rail Switch 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
Engine-ECU
1st and 2nd rail switch
21
7.5A
2
J/B
C-208
C-207
4
C-30
10
1
C-29
2
4
A-115
6
OFF
ON
C-105
B-06
MU802662
AC
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