Mitsubishi Montero Sport (2004+). Manual — part 237
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-361
STEP 3. Check harness connector E-48 at left bank heated
oxygen sensor (rear) and harness connector C-90, C-91 at
PCM for damage.
Q: Is the harness connector in good condition?
YES : Replace the PCM. Then go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 4.
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 4 −
Heated Oxygen Sensor Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0159 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK200498
1
2
3
4
E-48(B)
AB
CONNECTOR: E-48
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
AK104029
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
98
78
71
88
89
76
77
72
79
91
73
80
74
75
81
92
82
83
93
84
85
94
86
87
95
96
90
97
AB
CONNECTORS: C-90, C-91
C-90(GR) C-91(GR)
C-90 HARNESS CONNECTOR:
COMPONENT SIDE
C-91 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-362
DTC P0161: Heated Oxygen Sensor Heater Circuit (bank 2 sensor 2)
Left Bank Heated Oxygen Sensor (rear) Circuit
AK200186
RED
RED
WHITE-
BLA
CK
WHITE-
BLA
CK
WHITE-
BLA
CK
POWERTRAIN CONTROL MODULE (PCM)
1
2
22
33
1
3
2
4
3
4
12
27
26
MFI
RELAY
LEFT BANK HEATED OXYGEN
SENSOR (REAR)
FUSIBLE LINK (12)
TO PCM TO PCM
C-59
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-14
10
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
31 32 33
34 35
1
C-89
(MU803784)
YELLO
W
-
BLA
CK
RED
RED
YELLO
W
-
BLA
CK
YELLO
W
-
BLA
CK
17
6
6
1
1
10
15
2
11
3
12
4
13 14
5
16
6
17
7
18
8
19
9
20
E-45
RED
1 2
3 4
E-48
MU802605
6
10
2
7
8
3 4 5
9
11 12 13
1
C-79
MU801553
JOINT
CONNECTOR (5)
1
2
3
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-363
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the left bank heated oxygen sensor
(rear) heater.
• The PCM (terminal No. 26) controls continuity to
the left bank heated oxygen sensor (rear) heater
by turning the power transistor in the PCM "ON"
and "OFF".
.
BACKGROUND
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor heater (rear) current
is out of specified range when engine coolant
temperature is over 20
°C (68°F).
.
AK103911AB
CONNECTOR: C-14
C-14
AK103911AC
CONNECTOR: C-79
C-79
AK200018 AC
CONNECTOR: E-45
E-45(B)
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK103738AD
CONNECTOR: C-89
PCM
C-89(GR)
AK200497
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
E-48(B)
AB
CONNECTOR: E-48
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-364
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Engine coolant temperature sensor
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the left bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgment Criteria
• Heater current of the left bank heated oxygen
sensor (rear) heater has continued to be lower
than 0.16 ampere or higher than 5.0 ampere for 4
seconds.
.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 5.0A
AK301443
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