Mitsubishi Eclipse. Manual — part 205
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-313
STEP 3. Check harness connector C-23 at heated oxygen
sensor (rear) and harness connector C-60 at ECM <M/T> or
C-54, C-57 at PCM <M/T> for damage.
Q: Is the harness connector in good condition?
YES : Replace the ECM or PCM.Then go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 4.
AK300405
2
1
6 5 4 3
AB
C-23
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: C-23
HARNESS
CONNECTOR:
HARNESS SIDE
AK300415
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
CONNECTOR: C-60 <M/T>
AB
C-60 (G)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-314
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 P0139 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK300418
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-54, C-57 <A/T>
C-57 (GR)
C-54 (GR)
AB
C-57 HARNESS CONNECTOR:
COMPONENT SIDE
C-54 HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-315
DTC P0141: Heated Oxygen Sensor Heater Circuit (sensor 2)
AK101514
5 6
3 4
2
1
RED
-
WHITE
RED
-
WHITE
RED
-
WHITE
RED
BL
UE-
WHITE
BATTERY
MFI
RELAY
HEATED OXYGEN
SENSOR (REAR)
C-23
MU801448
TO ECM
OR PCM
TO ECM
OR PCM
4
3
Heated Oxygen Sensor (rear) Heater Circuit
1
3
2
4
5
6
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
54 <M/T>
26 <A/T>
C-50 <A/T>
(MU803784)
C-56 <M/T>
(MU803770)
57 58
60 61
53
52
51
55
54
56
59
62
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
3 4
1 2
A-18X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-316
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 4) to the heated oxygen sensor (rear) heater.
• The ECM (terminal No. 54) <M/T> or PCM (termi-
nal No. 26) <A/T> controls continuity to the
heated oxygen sensor (rear) heater by turning
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
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
.
AK300060
ECM
CONNECTOR: C-56 <M/T>
AF
C-56 (G)
AK300060AD
C-50 (GR)
PCM
CONNECTOR: C-50 <A/T>
AK300054AB
C-23
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: C-23
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
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