Mitsubishi Eclipse. Manual — part 472
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-431
STEP 3. Check harness connector B-23 at left bank heated
oxygen sensor (rear) and harness connector C-58, C-62 at
ECM or C-55, C-59 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.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300441
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
CONNECTORS: C-58, C-62 <M/T>
C-58 (GR)
C-62 (GR)
AB
C-62 HARNESS CONNECTOR:
COMPONENT SIDE
C-58 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-432
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.
AK300459
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
CONNECTORS: C-55, C-59 <A/T>
C-55 (GR)
C-59 (GR)
AB
C-59 HARNESS CONNECTOR:
COMPONENT SIDE
C-55 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-433
DTC P0161: Heated Oxygen Sensor Heater Circuit (bank 2, sensor 2)
AK101603
RED
-
WHITE
RED
-
WHITE
RED
-
WHITE
RED
BL
UE-
WHITE
3 4
1 2
BATTERY
MFI
RELAY
LEFT BANK HEATED
OXYGEN SENSOR (REAR)
TO ECM
OR PCM
TO ECM
OR PCM
4
3
1
4
2
2
1
3
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
26
B-23
MU802665
C-51 <M/T>, C-52 <A/T>
(MU803784)
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
3132 33
34 35
1
10
Left Bank Heated Oxygen Sensor (rear) Heater Circuit
3 4
1 2
A-18X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-434
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal 4)
to the left bank heated oxygen sensor (rear)
heater.
• The ECM (terminal No. 26) <M/T> or PCM (termi-
nal No. 26) <A/T> controls continuity to the left
bank heated oxygen sensor (rear) heater by turn-
ing the power transistor in the ECM <M/T> or
PCM <A/T> "ON" and "OFF".
.
BACKGROUND
• The ECM <M/T> or PCM <A/T> checks whether
the heater current is within a specified range
when the heater is energized.
.
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).
.
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
.
AK300058
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300091
CONNECTOR: C-51 <M/T>
ECM
AF
C-51 (GR)
AK300244
CONNECTOR: C-52 <A/T>
AC
PCM
C-52 (GR)
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