Mitsubishi Eclipse. Manual — part 180
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-213
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is between −10°C
(14
°F) and 77°C (171°F) when the engine is
started.
• The engine coolant temperature − intake air tem-
perature is 5
°C (9°F) or less when the engine is
started.
• The intake air temperature when the engine is
started
− intake air temperature is 5°C (9°F) or
less.
• The volume airflow sensors output frequency is in
the low frequency (50
− 100 Hz or less) state for
300 seconds or less.
Judgment Criteria
• The time for the engine coolant temperature to
rise to 77
°C (171°F) takes longer than approxi-
mately 11 to 22 minutes.
• The PCM monitors for this condition once during
the drive cycle.
.
OBD-ll DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• The thermostat is faulty
• ECM <M/T> failed.
• PCM <A/T> failed.
START
END
YES
NO
NO
YES
MALFUNCTION
GOOD
TIME HAVE PASSED
AFTER STARTING?*
ENGINE COOLANT TEMP.
>=77˚C (171˚F)
*: See DTC SET CONDITIONS-JUDGMENT CRITERIA
MONITORING
CONDITIONS?
NO
YES
AK204044
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-214
DIAGNOSIS
STEP 1. Check the cooling system.
Refer to GROUP 14, Engine Cooling Diagnosis
Q: Is the cooling system normal?
YES : Replace the ECM <M/T> or PCM<A/T>. Then check
that the DTC P0128 does not reset.
NO : Repair it. Then check that the DTC P0128 does not
reset.
DTC P0130: Heated Oxygen Sensor Circuit (sensor 1)
AK000657
4
1 2
3
BL
ACK
BL
ACK
WHITE
B-17
MU802605
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
HEATED OXYGEN
SENSOR (FRONT)
FROM MFI RELAY
TO ECM
OR PCM
1
2
3
4
92 <M/T>
57 <A/T>*1
76 <M/T>
71 <A/T>*2
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>
98
78
71
88 89
76 77
72
79
91
73
80
74
75
81
92
8283
93
8485
94
8687
9596
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 (front) Circuit
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-215
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 76) <M/T> or PCM (terminal No. 71)
<A/T> from the output terminal (terminal No. 4) of
the heated oxygen sensor (front).
• Terminal No. 2 of the heated oxygen sensor
(front) is grounded with ECM (terminal No. 92)
<M/T> or PCM (terminal No. 57) <A/T>.
.
TECHNICAL DESCRIPTION
• The heated oxygen sensor (front) detects the
concentration of oxygen in the exhaust gas; it
converts those data to voltage, and inputs the
resulting signals to the ECM <M/T> or PCM
<A/T>.
• When the heated oxygen sensor (front) begins to
deteriorate, the heated oxygen sensor signal
response becomes poor.
• The ECM <M/T> or PCM <A/T> forcibly varies
the air/fuel mixture to make it leaner and richer,
and checks the response speed of the heated
oxygen sensor (front). In addition, the ECM
<M/T> or PCM <A/T> also checks for an open
circuit in the heated oxygen sensor (front) output
line.
.
DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (front) circuit is switched to 5
volts intentionally when oxygen sensor output is
low, and detects the malfunction if the output volt-
age changes to equal or greater than 4.5 volts.
The above procedure is repeated when oxygen
sensor is inactive.
.
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
• Misfire monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
AK300051AB
B-17 (B)
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-17
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-216
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Heated oxygen sensor (front) signal voltage has
continued to be 0.2 volt or lower.
• Engine coolant temperature is higher than 76°C
(169
°F).
• Engine speed is higher than 1,200 r/min.
• Volumetric efficiency is higher than 25 percent.
• Monitoring time: 7 seconds.
START
V
F
> =4.5V
2secs HAS PASSED
YES
YES
YES
NO
NO
NO
MALFUNCTION
MONITORING
CONDITIONS
YES
NO
MONITORING
CONDITIONS
+5V ON
AK301436
V
F
< 0.2V
10secs HAS PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
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