Mitsubishi Colt Ralliart. Manual — part 28
![](/vehicles/winoney/ama/flend/zillgor.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-66
STEP 9. Perform voltage measurement at A-122
oxygen sensor connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Transmission: P range
• Engine: After warm-up
• Voltage between terminal No. 1 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 10 .
STEP 10. Check oxygen sensor itself
• Check oxygen sensor itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace oxygen sensor.
STEP 11. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Check and repair harness between A-122
(terminal No. 1) oxygen sensor connector
and A-114 (terminal No. 34) engine-ECU
connector or engine-CVT-ECU connector.
• Check output line for open circuit.
NO :
Repair or replace the connector.
AK402012
2 1
4 3
Connector: A-122
A-122 (G)
AC
Oxygen sensor (front)
A-122 Harness side
connector
AK402745
6
4
2
5
3
1
9
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L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
AK402012
2 1
4 3
Connector: A-122
A-122 (G)
AC
Oxygen sensor (front)
A-122 Harness side
connector
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/abeer.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-67
STEP 12. Perform voltage measurement at A-114
engine-ECU connector or engine-CVT-ECU
connector.
• Disconnect engine-ECU connector or
engine-CVT-ECU connector, and connect special
tool power plant ECU check harness
(MB991987), and then measure the voltage on
the check connector.
• Transmission: P range
• Engine: After warm-up
• Voltage between terminal No. 34 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 14 .
NO :
Go to Step 13 .
STEP 13. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Check and repair harness between A-122
(terminal No. 1) oxygen sensor connector
and A-114 (terminal No. 34) engine-ECU
connector or engine-CVT-ECU connector.
• Check output line for damage.
NO :
Repair or replace the connector.
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
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65
66
L
AE
A-114
Connector:
A-114
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
A-114 Special tool power plant ECU check
harness
AK402745
6
4
2
5
3
1
9
7
8
10
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58
59
60
61
62
63
64
65
66
L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
AK402012
2 1
4 3
Connector: A-122
A-122 (G)
AC
Oxygen sensor (front)
A-122 Harness side
connector
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/tell.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-68
STEP 14. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
AK402745
6
4
2
5
3
1
9
7
8
10
11
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51
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53
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55
56
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58
59
60
61
62
63
64
65
66
L
AD
A-114
Connector:
A-114
Harness side connector
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/egos.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-69
Code No. P0135: Oxygen Sensor (Front) Heater System
OPERATION
• Power is supplied to the heater power terminal
(terminal No. 3) of the oxygen sensor connector
from the engine control relay (terminal No. 4).
• The heater (terminal No. 4) of the oxygen sensor
connector is controlled by the power transistor in
the engine-ECU <M/T> or engine-CVT-ECU
<CVT> (terminal No. 51).
FUNCTION
• The power supply to the oxygen sensor heater is
controlled by the ON/OFF control of the power
transistor in the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
• Heating the oxygen sensor heater enables the
oxygen sensor to provide good response even
when the exhaust emission temperature is low.
AK402681
3
1
2
4
1 2
4
3
19
21
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1213
11
8 9
L
10
37
52 53 54 555657585960616263646566
38 39 404142434445464748495051
22 23 24 252627282930313233343536
7
5
3
1
6
4
2
3
1
1
1
4
6
2
Oxygen sensor (front)
3
2
4
1
51
Engine
control
relay
R
LG-R
R
Fusible link
B-106
A-114
B-112
B-108
A-122
MU802083
Oxygen Sensor (front) Heater Circuit
16
20A
J/B
AD
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
To engine-ECU <M/T> or
engine-CVT-ECU <CVT>
To engine-ECU <M/T> or
engine-CVT-ECU <CVT>
A-17
4
R
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
Main
Index
Group
TOC
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