Mitsubishi L200. Manual — part 173
TROUBLESHOOTING
DIESEL FUEL
13A-488
• Failed engine control relay
• Damaged harness (Open circuit between engine-
ECU and engine control relay, engine control
relay and relay box, engine-ECU and earth, and
open circuit between engine-ECU and J/B)
• Damaged connector (Engine-ECU connector,
diagnosis 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. Check engine control relay itself.
• Check engine control relay itself (Refer to
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the engine control relay.
STEP 3. Connector check: A-20X engine control
relay connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
STEP 4. Perform voltage measurement at A-20X
engine control relay connector.
• Remove relay, and measure at harness side.
• Voltage between terminal No. 1 and earth, also
between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Check intermediate connector A-115, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between A-20X (terminal No. 1 and
terminal No. 4) engine control relay
connector and battery.
STEP 5. Connector check: C-103 engine-ECU
connector.
Q: Is the check result normal?
AK501321
2
1
3
4
Relay box's side
connector
A-20X
Connector: A-20X
AC
AK501321
2
1
3
4
Relay box's side
connector
A-20X
Connector: A-20X
AC
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
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114
115
118
119
120
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129
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143
146
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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-489
YES :
Go to Step 6 .
NO :
Repair or replace.
STEP 6. Perform voltage measurement at C-103
engine-ECU connector
• Disconnect connector, and measure at harness
side.
• Voltage between terminal No. 118 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair the harness wire.
STEP 7. Perform voltage measurement at C-103
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Short-circuit terminal No. 118 to earth.
• Voltage between terminal No. 101 and earth also
between terminal No. 102 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair the harness wire.
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
120
121
122
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125
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127
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129
130
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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
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-490
STEP 8. Check for open circuit between engine-
ECU connector C-103 and earth.
• Disconnect connector, and measure at harness
side.
• Check open circuit between terminal No. 145 and
earth.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair the harness wire.
STEP 9. Connector check: C-103 engine-ECU
connector.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace.
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
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-491
STEP 10. Check for open circuit between engine-
ECU connector C-103 and earth.
• Disconnect connector.
• Check open circuit between terminal No. 116 and
earth also between terminal No. 117 and earth.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair the harness wire.
STEP 11. Perform voltage measurement at C-103
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 104 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Check intermediate connector C-53 <L. H.
drive vehicles> or C-35 <R. H. drive
vehicles>, and repair if necessary. If
intermediate connector is normal, check and
repair harness between C-103 (terminal No.
104) engine-ECU connector and C-208 J/B
connector.
STEP 12. Check the trouble symptoms.
Q: Does trouble symptom persist?
AKA00090
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
118
119
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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
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
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