Mitsubishi Grandis. Manual — part 702
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-59
STEP 4. 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 5 .
NO :
Repair or replace.
STEP 5. Check harness between B-22 (terminal
No. 2) cylinder 1, 4 oxygen sensor (front)
connector and C-113 (terminal No. 96)
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair.
STEP 6. MUT-III data list
• Refer to Data List Reference Table
a. Item 11: Cylinder 1, 4 oxygen sensor (front)
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
AK305616AB
Connector: C-113
<L.H. drive vehicles>
<R.H. drive vehicles>
C-113 (GR)
C-113 (GR)
91
92
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95
96
97
98
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101
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108
109
110
111
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113
114
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118
119
120
Harness side connector
AK300973
1
2
3
4
AB
ƒn
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-60
STEP 7. Perform voltage measurement at B-22
cylinder 1, 4 oxygen sensor (front) connector.
• Use special tool test harness (MB991316) to
connect connector, and measure at pick-up
harness.
• Engine: After warm-up
• Transmission: Neutral <M/T> or P range <A/T>.
• Voltage between terminal No. 4 and earth.
OK:
When the engine is 2,500 r/min, the output
voltage should repeat 0 to 0.8 V alternately.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Go to Step 8 .
STEP 8. Check cylinder 1, 4 oxygen sensor
(front) itself.
• Check cylinder 1, 4 oxygen sensor (front) itself
(Refer to
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Replace cylinder 1, 4 oxygen sensor (front).
STEP 9. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Check and repair harness between B-22
(terminal No. 4) Cylinder 1, 4 oxygen sensor
(front) connector and C-113 (terminal No.
109) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
• Check output line for damage.
NO :
Repair or replace.
AK300973
1
2
3
4
AB
ƒn
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-61
STEP 10. Perform voltage measurement at C-113
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.
• Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
• Transmission: Neutral <M/T> or P range <A/T>
• Engine: After warm-up
• Voltage between terminal No. 109 and earth.
OK:
When the engine is 2,500 r/min, the output
voltage should repeat 0 to 0.8 V alternately.
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Go to Step 11 .
STEP 11. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector
Q: Is the check result normal?
YES :
Check and repair harness between B-22
(terminal No. 4) oxygen sensor (front)
connector and C-113 (terminal No. 109)
engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.
• Check output line for open circuit.
NO :
Repair or replace.
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
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
AK300973
1
2
3
4
AB
ƒn
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-62
STEP 12. 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 6 .
NO :
Repair or replace.
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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