Mitsubishi Lancer Evolution IX. Manual — part 401
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-79
Q: Is the check result normal?
YES :
Check and repair harness between B-113
(terminal No. 2) oxygen sensor (front)
connector and C-119 (terminal No. 49)
engine-ECU connector.
• Check earthing line for damage.
NO :
Repair or replace the connector.
STEP 9. Perform voltage measurement at B-113
oxygen sensor (front) connector.
• Use special tool test harness (MD998464) to con-
nect connector, and measure at pick-up harness.
• Engine: After warm-up
• Voltage between terminal No. 4 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 (front) itself
• Check oxygen sensor itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace the oxygen sensor (front).
STEP 11. Connector check: C-117 engine-ECU
connector
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
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>
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-80
Q: Is the check result normal?
YES :
Check and repair harness between B-113
(terminal No. 4) oxygen sensor (front)
connector and C-117 (terminal No. 71)
engine-ECU connector.
• Check output line for damage.
NO :
Repair or replace the connector.
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. 71 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
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>
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-81
Q: Is the check result normal?
YES :
Check and repair harness between B-113
(terminal No. 4) oxygen sensor (front)
connector and C-117 (terminal No. 71)
engine-ECU connector.
• Check output line for open circuit.
NO :
Repair or replace the connector.
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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-82
Code No. P0135: Oxygen Sensor Heater (front) System
OPERATION
• Power is supplied to the heater power terminal
(terminal No. 1) of the oxygen sensor (front) con-
nector from the engine control relay (terminal No.
4).
• The heater (terminal No. 3) of the oxygen sensor
(front) connector is controlled by the power tran-
sistor in the engine-ECU (terminal No. 3).
1
2
3
4
1
2
3
4
AK501806
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
B-12X
B-Y
B-Y
B-Y
Oxygen sensor (front)
1
2
3
4
To engine-ECU
Engine-ECU
3
L-R
R-Y
Engine
control
relay
Oxygen sensor heater (front) circuit
Battery
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
AB
C-121
(MU803783)
6 <A-13> (*1) or
13 <C-31> (*2)
2
1
4
3
B-113
MU802605
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
To engine-ECU
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