Mitsubishi Colt Ralliart. Manual — part 686
![](/vehicles/winoney/ama/flend/jus.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-69
STEP 8. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-122
(terminal No. 2) oxygen sensor (front)
connector and A-114 (terminal No.49)
engine-ECU connector.
• Check earthing line for damage.
NO :
Repair or replace.
STEP 9. Perform voltage measurement at A-122
oxygen sensor (front) connector.
• Use special tool test harness (MB991658) to con-
nect connector, and measure at pick-up harness.
• Transmission: P range
• Engine: Idling after warm-up
• Voltage between terminal No. 1 and earth.
OK:
When the engine is idling and running at 2,500
r/min, the output voltage repeats changing
between 0 and 0.8 V.
When the engine is rapidly decelerated from
4,000 r/min, the output voltage below 200 mV
increases to between 600 and 1,000 mV after
a lapse of a few seconds.
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 (front) itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace oxygen sensor.
AK402745
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L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/ithifueleari.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-70
STEP 11. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-122
(terminal No. 1) oxygen sensor (front)
connector and A-114 (terminal No. 34)
engine-ECU connector.
• Check output line for damage.
NO :
Repair or replace.
STEP 12. Perform voltage measurement at A-114
engine-ECU connector.
• Disconnect connector, connect special tool power
plant ECU check harness (MB991987) and
measure the voltage on the check connector.
• Transmission: Neutral
• Engine: Idling after warm-up
• Voltage between terminal No. 34 and earth.
OK:
When the engine is idling and running at 2,500
r/min, the output voltage repeats changing
between 0 and 0.8 V.
When the engine is rapidly decelerated from
4,000 r/min, the output voltage below 200 mV
increases to between 600 and 1,000 mV after
a lapse of a few seconds.
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Go to Step 13 .
AK402745
6
4
2
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3
1
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62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402745
6
4
2
5
3
1
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61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/zarresast.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-71
STEP 13. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between A-122
(terminal No. 1) oxygen sensor (front)
connector and A-114 (terminal No. 34)
engine-ECU connector.
• Check output line for open circuit.
NO :
Repair or replace.
STEP 14. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace.
AK402745
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4
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51
52
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58
59
60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402745
6
4
2
5
3
1
9
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61
62
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66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/iller.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-72
Code No. P0135: Oxygen Sensor (front) Heater System
OPERATION
• Power is supplied to the heater power terminal
(terminal No. 3) of the oxygen sensor (front) con-
nector from the engine control relay (terminal No.
4).
• The heater (terminal No. 4) of the oxygen sensor
(front) connector is controlled by the power tran-
sistor in the engine-ECU (terminal No. 51).
FUNCTION
• Power supply to the oxygen sensor (front) heater
is controlled through ON-OFF control of the
power transistor in the engine-ECU.
• The oxygen sensor (front) heater helps the oxy-
gen sensor be highly responsive particularly
when the exhaust emission temperature is low.
AK402681
3
1
2
4
1 2
4
3
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1213
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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 Heater (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 P: Purple
16
20A
J/B
AE
Engine-ECU
To engine-ECU
To engine-ECU
A-17
4
R
Main
Index
Group
TOC
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