Mitsubishi Eclipse. Manual — part 202
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-301
STEP 5. 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 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0137 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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
AK300735
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
CONNECTOR: C-57 <A/T>
C-57 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-302
DTC P0138: Heated Oxygen Sensor Circuit High Voltage (sensor 2)
AK103266
BL
ACK
BL
UE
YELL
OW
FROM MFI RELAY
HEATED OXYGEN
SENSOR (REAR)
C-23
MU801448
TO ECM
OR PCM
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
75 <M/T>
73 <A/T>*2
92 <M/T>
57 <A/T>*1
C-60 <M/T>
(MU803772)
C-54 <A/T>
(MU803781)
C-57 <A/T>
(MU803782)
NOTE
*1:PCM connector C-54 <A/T>
*2:PCM connector C-57 <A/T>
5
6
4
3
1
2
3 4 5 6
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
82
78
81
80
89 90 91 92
79
87
71
74
73
72
76
75
77
85
88
83 84
86
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
Heated Oxygen Sensor (rear) Circuit
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-303
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 75) <M/T> or PCM (terminal No. 73)
<A/T> from the output terminal (terminal No. 3) of
the heated oxygen sensor (rear).
• Terminal No. 4 of the heated oxygen sensor
(rear) is grounded with ECM (terminal No. 92)
<M/T> or PCM (terminal No. 57) <A/T>.
.
TECHNICAL DESCRIPTION
• The output signal of the heated oxygen sensor
(front) is compensated by the output signal of the
heated oxygen sensor (rear).
• The ECM <M/T> or PCM <A/T> checks for an
open circuit in the heated oxygen sensor (rear)
output line.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (rear) output voltage is over
specified range.
.
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)
• Heated oxygen sensor heater (front) monitor
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK300054AB
C-23
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: C-23
AK300060
ECM
CONNECTOR: C-60 <M/T>
AE
C-60 (G)
AK300060
PCM
CONNECTORS: C-54, C-57 <A/T>
AI
C-57 (GR)
C-54 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-304
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
Judgment Criteria
• Heated oxygen sensor (rear) output voltage has
continued to be 1.2 volts or higher for 2 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Short circuit in heated oxygen sensor (rear) out-
put line.
• Connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>
DIAGNOSIS
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
2secs HAVE PASSED?
OUTPUT VOLTAGE > 1.2V
NO
YES
MONITORING
CONDITIONS
AK301441
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