Mitsubishi L200. Manual — part 134
TROUBLESHOOTING
DIESEL FUEL
13A-332
Code No. P2122: Accelerator Pedal Position Sensor (main) Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the accelera-
tor pedal position sensor (terminal No. 1) from the
engine-ECU (terminal No. 149).
• The power voltage is earthed to the engine-ECU
(terminal No. 151) from the accelerator pedal
position sensor (terminal No. 2).
• The sensor signal is inputted to the engine-ECU
(terminal No. 150) from the accelerator pedal
position sensor output terminal (terminal No. 3).
FUNCTION
• The accelerator pedal position sensor (main) out-
puts voltage which corresponds to the accelera-
tor pedal depression.
• The engine-ECU checks whether the voltage is
within a specified range.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position
• Accelerator pedal position sensor (sub) is normal
Judgment Criterion
• Accelerator pedal position sensor (main) output
voltage is lower than 0.2 V for 0.3 seconds.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Open/short circuit or harness damage in acceler-
ator pedal position sensor circuit or loose con-
nector contact
• Failed engine-ECU
AKA00109
6
1 2 3 4 5
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
Accelerator Pedal Position Sensor (main) Circuit
(main)
Hall IC
Accelerator
pedal
position
sensor
C-115
(MU805200)
1
149
5 V
L-W
3
150
GR
2
151
BR-W
C-103
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple SI: Silver
Engine-ECU
AB
TROUBLESHOOTING
DIESEL FUEL
13A-333
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 9: Accelerator pedal position sensor
(main)
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: C-115 accelerator
pedal position 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 C-115
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• 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 7 .
NO :
Go to Step 4 .
AK700804
1
6 5 4 3 2
C-115 (B)
C-115 (B)
Connector: C-115
<R.H. drive vehicles>
<L.H. drive vehicles>
AB
Harness side connector
AK700804
1
6 5 4 3 2
C-115 (B)
C-115 (B)
Connector: C-115
<R.H. drive vehicles>
<L.H. drive vehicles>
AB
Harness side connector
TROUBLESHOOTING
DIESEL FUEL
13A-334
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.
STEP 5. Check harness between C-115 (terminal
No. 1) accelerator pedal position sensor
connector and C-103 (terminal No. 149) engine-
ECU connector.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
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
AK700804
1
6 5 4 3 2
C-115 (B)
C-115 (B)
Connector: C-115
<R.H. drive vehicles>
<L.H. drive vehicles>
AB
Harness side 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
TROUBLESHOOTING
DIESEL FUEL
13A-335
STEP 6. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 9: Accelerator pedal position sensor
(main)
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. Perform resistance measurement at C-
115 accelerator pedal position 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 10 .
NO :
Go to Step 8 .
STEP 8. Connector check: C-103 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the connector.
AK700804
1
6 5 4 3 2
C-115 (B)
C-115 (B)
Connector: C-115
<R.H. drive vehicles>
<L.H. drive vehicles>
AB
Harness side 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
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