Mitsubishi Lancer Evolution IX. Manual — part 404
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-91
STEP 6. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 59: Oxygen sensor (rear)
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Replace the engine-ECU.
STEP 7. Perform voltage measurement at C-137
oxygen sensor (rear) connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Engine: After warm-up
• Ignition switch: "ON"
• Voltage between terminal No. 2 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Go to Step 8 .
STEP 8. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-137
(terminal No. 2) oxygen sensor (rear)
connector and C-119 (terminal No. 49)
engine-ECU connector.
• Check earthing line for damage.
NO :
Repair or replace the connector.
AK305013
2 1
3
4
AB
Oxygen sensor(rear)
Connector : C-137
Harness side
connector
C-137
AK501994
65
43
50
42
49
41
48
60
61
64
46
47
58
59
67
68
45
56
66
52 51
44
53
62
54
63
57
55
AB
Connector: C-119
C-119 (GR)
C-119 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305013
2 1
3
4
AB
Oxygen sensor(rear)
Connector : C-137
Harness side
connector
C-137
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-92
STEP 9. Perform voltage measurement at C-137
oxygen sensor (rear) connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Engine: After warm-up
• Voltage between terminal No. 1 and earth.
OK:
600
− 1,000 mV when 200 mV or lower abrupt
racing is done a few seconds after abrupt
deceleration from 4,000 r/min.
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Go to Step 10 .
STEP 10. Check oxygen sensor (rear) itself
• Check oxygen sensor (rear) itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace the oxygen (rear) sensor.
STEP 11. Connector check: C-117 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-137
(terminal No. 1) oxygen sensor (rear)
connector and C-117 (terminal No. 73)
engine-ECU connector.
• Check output line for damage.
NO :
Repair or replace the connector.
AK305013
2 1
3
4
AB
Oxygen sensor(rear)
Connector : C-137
Harness side
connector
C-137
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305013
2 1
3
4
AB
Oxygen sensor(rear)
Connector : C-137
Harness side
connector
C-137
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-93
STEP 12. Perform voltage measurement at C-117
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Transmission: Neutral
• Engine: After warm-up
• Voltage between terminal No. 73 and earth.
OK:
600
− 1,000 mV when 200 mV or lower abrupt
racing is done a few seconds after abrupt
deceleration from 4,000 r/min.
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Go to Step 13 .
STEP 13. Connector check: C-117 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-137
(terminal No. 1) oxygen sensor (rear)
connector and C-117 (terminal No. 73)
engine-ECU connector.
• Check output line for open circuit.
NO :
Repair or replace the connector.
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK305013
2 1
3
4
AB
Oxygen sensor(rear)
Connector : C-137
Harness side
connector
C-137
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-94
STEP 14. Connector check: C-117 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
AK501996
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97 96
100
89
78
71
90
76
77
75
72
79
AB
Connector: C-117
C-117 (GR)
C-117 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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