Mitsubishi Eclipse. Manual — part 455
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-363
STEP 3. 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 P0152 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK300460
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-59 <A/T>
C-59 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300445
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
CONNECTOR: C-62 <M/T>
C-62 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-364
DTC P0153: Heated Oxygen Sensor Circuit Slow Responce (bank 2, sensor 1)
AK000694
4
1 2
3
BL
ACK
BL
ACK
WHITE
B-24
MU802605
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
LEFT BANK HEATED OXYGEN
SENSOR (FRONT)
FROM MFI RELAY
TO ECM
OR PCM
1
2
3
4
49 <M/T>*1
57 <A/T>*3
71 <M/T>*2
71 <A/T>*4
NOTE
*1:ECM connector C-58 <M/T>
*2:ECM connector C-62 <M/T>
*3:PCM connector C-55 <A/T>
*4:PCM connector C-59 <A/T>
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
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
97
C-62 <M/T>
(MU803783)
C-59 <A/T>
(MU803782)
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
C-58 <M/T>
(MU803782)
C-55 <A/T>
(MU803781)
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
Left Bank Heated Oxygen Sensor (front) Circuit
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-365
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 71) <M/T> or PCM (terminal No. 71)
<A/T> from the output terminal (terminal No. 4) of
the left bank heated oxygen sensor (front).
• Terminal No. 2 of the left bank heated oxygen
sensor (front) is grounded with ECM (terminal
No. 49) <M/T> or PCM (terminal No. 57) <A/T>.
.
TECHNICAL DESCRIPTION
• The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts that data to voltage, and
sends it to the ECM <M/T> or PCM <A/T>.
• When the left bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response deteriorates also.
• The ECM <M/T> or PCM <A/T> varies the air/fuel
mixture to make it leaner and richer, and checks
the response speed of the left bank heated oxy-
gen sensor (front). In addition, the ECM <M/T> or
PCM <A/T> also checks for an open circuit in the
left bank heated oxygen sensor (front) output
line.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (front) rich/lean
switching frequency is under specified value.
.
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
.
AK300061
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-24
AB
B-24 (B)
AK300244
CONNECTORS: C-52, C-59 <A/T>
AF
PCM
C-52 (GR)
C-59 (GR)
AK300091
CONNECTORS: C-58, C-62 <M/T>
ECM
AD
C-58 (GR)
C-62 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-366
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 50°C
(122
°F).
• Engine speed is at between 1,250 and 3,000
r/min.
• Volumetric efficiency is between 20 and 60 per-
cent at AT.
• Volumetric efficiency is between 18 and 60 per-
cent at MT.
• Under the closed loop air/fuel control.
• The throttle valve is open.
• Short-term fuel trim is higher than −30 and lower
than +25 percent.
• More than 3 seconds have elapsed after the
abovementioned conditions have been met.
• The ECM <M/T> or PCM <A/T> monitors for this
condition for 7 cycles of 12 second each during
the drive cycle.
Judgment Criteria
• The left bank heated oxygen sensor (front) sends
"lean" and "rich" signals alternately 11 times or
less for 12 seconds.
NOTE: If the sensor switch time is longer than the
Judgment Criteria due to the MUT-III OBD-II test
Mode
−
H02S Test Results, it is assumed that the
heated oxygen sensor has deteriorated. If it is
short, it is assumed that the harness wire is bro-
ken or has a short circuit.
If the heated oxygen sensor signal voltage has
not changed even once (lean/rich) after the DTC
was erased, the sensor switch time will display as
0 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
F1: THRESHOLD VALUE FOR REAL-TIME SWITDHING FREQUENCY
F0: THRESHOLD VALUE FOR AVERAGE SWITDHING FREQUENCY
START
MONITORING
CONDITIONS
MALFUNCTION
GOOD
END
NO
NO
YES
YES
Ff < F0
CALCULATE AVERAGE SWITCHING
FREQUENCY (Ff) OVER SPECIFIED TIMES
AK301438
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