Mitsubishi Colt Ralliart. Manual — part 726
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-229
Code No. P2138: Accelerator Pedal Position Sensor (Main and Sub) Range/Performance Problem
OPERATION
• Refer to Code No. P2122: Accelerator Pedal
Position Sensor (main) Circuit Low Input
.
• Refer to Code No. P2127: Accelerator Pedal
Position Sensor (sub) Circuit Low Input
.
FUNCTION
• Engine-ECU checks the accelerator pedal posi-
tion sensor output signal characteristics for
abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position.
• Not while engine is being cranked.
• Battery voltage is more than 6.3 V.
• Accelerator pedal position sensor (main) output
voltage is more than 0.2 V and is less than 4.8 V.
• Accelerator pedal position sensor (sub) output
voltage is more than 0.2 V and is less than 2.5 V.
Judgement Criterion
• When variation in accelerator openinging angle is
small.
• Difference is more than 0.3 V between accelera-
tor pedal position sensor (sub) output voltage
multiplied by 2 and accelerator pedal position
sensor (main) output voltage.
PROBABLE CAUSE
• Failed accelerator pedal position sensor
• Open/short circuit in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-26 accelerator pedal
position connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at B-26
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 6 .
NO :
Go to Step 3 .
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-230
STEP 3. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
STEP 4. Check harness between B-26 (terminal
No. 2) accelerator pedal position sensor
connector and A-08 (terminal No. 84) engine-ECU
connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
STEP 5. Check the trouble symptoms
Q: Does trouble symptom persist?
YES :
Replace engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
AK402725
77
78
79
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83
84
92
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115
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121
107
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114
130
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132
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135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402725
77
78
79
80
81
82
83
84
92
93
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85
86
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105
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115
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120
121
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110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-231
STEP 6. Perform resistance measurement at B-26
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 5 and earth.
OK: Continuity (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Go to Step 7 .
STEP 7. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace.
STEP 8. Check harness between B-26 (terminal
No. 5) accelerator pedal position sensor
connector and A-08 (terminal No. 87) engine-ECU
connector.
• Check earthing line for damage.
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-232
STEP 9. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair or replace.
STEP 10. Check harness between B-26 (terminal
No. 1) accelerator pedal position sensor
connector and A-08 (terminal No. 85) engine-ECU
connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
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