Mitsubishi Lancer Evolution IX. Manual — part 400
![](/vehicles/winoney/wruvea/ger/pearoraldoru.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-75
Code No. P0130: Oxygen Sensor (front) System
OPERATION
• The sensor signal is inputted to the engine-ECU
(terminal No. 71) from the oxygen sensor (front)
output terminal (terminal No. 4).
• The oxygen sensor (front) (terminal No. 2) is
earthed with engine-ECU (terminal No. 49).
FUNCTION
• The oxygen sensor (front) converts the concen-
tration of oxygen in the exhaust emission into a
voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoreti-
cal air-fuel ratio, the oxygen sensor (front) out-
puts a voltage of about 1 V. When it is leaner than
the theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU con-
trols the fuel infection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
TROUBLE JUDGMENT
Check Conditions
• After 3 or more minutes from when the engine
has started up.
• Engine coolant temperature approximately 80°C
or more.
• Volumetric efficiency 25% or more.
• Engine speed of 1,200 r/min. or more.
Judgment Criterion
• When the oxygen sensor (front) output voltage is
0.2 V or less, and a power voltage of 5 V is
applied to the oxygen sensor (front) in the
engine-ECU, the sensor output voltage is 4.5 V or
more.
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Open/short circuit in oxygen sensor (front) circuit
or loose connector contact
• Failed engine-ECU
1
2
3
4
AK501805
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
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
Engine-ECU
Oxygen sensor (front)
From Engine control relay
To engine-ECU
1
2
3
4
49
B
W
71
Oxygen sensor (front) circuit
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-119
(MU803782)
B-113
MU802605
C-117
(MU803783)
![](/vehicles/winoney/wruvea/ger/ritwh.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-76
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 11: Oxygen sensor (front)
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Go to Step 2 .
STEP 2. Connector check: B-113 oxygen sensor
(front) connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform resistance measurement at
B-113 oxygen sensor (front) 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 7 .
NO :
Go to Step 4 .
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
![](/vehicles/winoney/wruvea/ger/wapa.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-77
STEP 4. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. Check harness between B-113 (terminal
No. 2) oxygen sensor connector and C-119
(terminal No. 49) engine-ECU connector.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair the damaged harness wire.
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>
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
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>
![](/vehicles/winoney/wruvea/ger/plou.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-78
STEP 6. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 11: 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 the engine-ECU.
STEP 7. 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
• 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
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
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>
AK305011
1
2
3
4
AB
Connector : B-113
Harness side
connector
B-113(B)
Oxygen sensor(front)
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