Mitsubishi Grandis. Manual — part 754
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-267
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 <M/T> or engine-A/T-ECU <A/T>
checks the accelerator pedal position sensor
output signal characteristics for abnormal
conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in ON position
• Accelerator pedal position sensor (main) output
voltage is 0.2
− 4.5 V.
• Accelerator pedal position sensor (sub) output
voltage is 0.2
− 4.5 V.
Judgment Criteria
• Accelerator pedal position sensor (sub) output
voltage minus Accelerator pedal position sensor
(main) output voltage is 1 volt or higher for 1
second.
• Accelerator pedal position sensor (main) output
voltage minus Accelerator pedal position sensor
(sub) output voltage is 1 volt or higher for 0.2
seconds.
PROBABLE CAUSE
• Failed accelerator pedal position sensor
• Open/short circuit in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-102 accelerator
pedal position connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-268
STEP 2. Perform resistance measurement at
C-102 accelerator pedal position sensor
connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 2 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 3 .
STEP 3. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair or replace.
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-269
STEP 4. Check harness between C-102 (terminal
No. 2) accelerator pedal position sensor
connector and C-113 (terminal No. 91)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> 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 <M/T> or
engine-A/T-ECU <A/T>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
STEP 6. Perform resistance measurement at
C-102 accelerator pedal position sensor
connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 5 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Go to Step 7 .
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-270
STEP 7. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair or replace.
STEP 8. Check harness between C-102 (terminal
No. 5) accelerator pedal position sensor
connector and C-113 (terminal No. 96)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.
• Check earthing line for damage.
Q: Is the check result normal?
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
AK305627
1
6 5 4 3 2
Connector: C-102
AB
C-102 (B)
Harness side
connector
C-102 (B)
<L.H. drive vehicles>
<R.H. drive vehicles>
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
Harness side connector
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