Mitsubishi L200. Manual — part 69
TROUBLESHOOTING
DIESEL FUEL
13A-72
STEP 11. Check harness between A-135 (terminal
No. 3) air flow sensor connector and C-103
(terminal No. 140) engine-ECU connector.
• Check output line for short circuit.
Q: Is the check result normal?
YES :
Replace the air flow sensor.
NO :
Repair the damaged harness wire.
STEP 12. Perform voltage measurement at C-103
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Disconnect A-135 air flow sensor connector.
• Ignition switch: ON
• Voltage between terminal No. 140 and earth.
OK: 4.9
− 5.1 V
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Go to Step 13 .
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
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129
130
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134
135
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137
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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
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123
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129
130
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133
134
135
136
137
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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
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
TROUBLESHOOTING
DIESEL FUEL
13A-73
STEP 13. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-135
(terminal No. 3) air-flow sensor connector
and C-103 (terminal No. 140) engine-ECU
connector.
• Check output line for open circuit.
NO :
Repair or replace the connector.
STEP 14. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace the connector.
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
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-74
Code No. P0103: Air Flow Sensor Circuit High Input
OPERATION
• Power is supplied by the engine control relay (ter-
minal No. 3) to the air flow sensor (terminal No.
5), and the air flow sensor (terminal No. 4) is
earthed through the engine-ECU (terminal No.
155).
• The air flow sensor (terminal No. 3) outputs a
sensor signal, which is input into the engine-ECU
(terminal No. 140).
AKA00355
1
2
3
4
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
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
5
4
3
2
1
W-R
W-B
W-B
W-B
Fusible link
BR-B
W-R
R
A-20X
Engine
control
relay
Relay
box
Air flow sensor
Engine-ECU
140
3
155
5
4
1
3
A-115
4
3
2
Air Flow Sensor Circuit
C-103
A-135
AB
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
To engine-ECU
OFF
ON
5 V
10
23
20A
Heat
sensitizing
resistance
TROUBLESHOOTING
DIESEL FUEL
13A-75
FUNCTION
• The air flow sensor outputs pulse signal that var-
ies in accordance with the intake air volume.
• In response to the signal, the engine-ECU con-
trols EGR control, 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.
Judgment Criterion
• The air flow sensor output voltage is 4.72 V or
more.
PROBABLE CAUSES
• Failed air flow sensor
• Open circuit in air flow sensor circuit or loose
connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. 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 :
Go to Step 2 .
STEP 2. Connector check: A-135 air flow sensor
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform resistance measurement at A-
135 air flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 4 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Go to Step 4 .
STEP 4. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
AKA00399
AB
Harness side
connector
A-135 (B)
Connector: A-135
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
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