Mitsubishi Outlander (2003+). Manual — part 53
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-75
STEP 8. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-18
(terminal No. 3) oxygen sensor connector
and C-137 (terminal No. 92) engine-ECU
connector.
Check earthing line for damage.
NO :
Repair.
STEP 9. Measure voltage at C-18 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. 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 (rear) itself.
Check oxygen sensor (rear) itself (Refer to
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Replace oxygen (rear) sensor.
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
AK300270
1 2
3 4
AB
Connector: C-18
Oxygen sensor (rear)
C-18
Harness side
connector
AK300270
1 2
3 4
AB
Connector: C-18
Oxygen sensor (rear)
C-18
Harness side
connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-76
STEP 11. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-18
(terminal No. 4) oxygen sensor connector
and C-137 (terminal No. 75) engine-ECU
connector.
Check output line for damage.
NO :
Repair.
STEP 12. Measure voltage at C-137 engine-ECU
connector.
Measure engine-ECU terminal voltage.
Transmission: Neutral
Engine: After warm-up
Voltage between terminal No. 75 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 .
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
AK300270
1 2
3 4
AB
Connector: C-18
Oxygen sensor (rear)
C-18
Harness side
connector
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-77
STEP 13. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-18
(terminal No. 4) oxygen sensor (rear)
connector and C-137 (terminal No. 75)
engine-ECU connector.
Check output line for open circuit.
NO :
Repair.
STEP 14. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair.
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
AK300270
1 2
3 4
AB
Connector: C-18
Oxygen sensor (rear)
C-18
Harness side
connector
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-78
Code No. P0141: Oxygen Sensor Heater (Rear) System <Sensor 2>
OPERATION
Power is supplied to the heater power terminal
(terminal No. 2) of the oxygen sensor (rear) con-
nector from the engine control relay (terminal No.
1).
The heater (terminal No. 1) of the oxygen sensor
(rear) connector is controlled by the power tran-
sistor in the engine-ECU (terminal No. 54).
FUNCTION
The power supply to the oxygen sensor heater
(rear) is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
Heating the oxygen sensor heater (rear) enables
the oxygen sensor to provide good response
even when the exhaust emission temperature is
low.
AK300271
1
2
3
4
1 2
3 4
57 58
60 61
53
52
51
55
54
56
59
62
AB
B-17X
1
2
R
R
W-B
W-B
Y-R
Oxygen sensor (rear)
2
3
1
4
To engine-ECU
Engine-ECU
54
Engine
control
relay
Oxygen sensor (rear) heater circuit
C-18
(MU801688)
Battery
4
3
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
2
1
J/C (2)
C-17
C-136
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