Mitsubishi Eclipse. Manual — part 467
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-411
STEP 14. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear)
connector B-23 and connect test harness special tool,
MB991316, to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant 80
°C (176°F) or
higher.
CAUTION
Be very careful when connecting the jumper wires; incor-
rect connection can damage the left bank heated oxygen
sensor (rear).
(3) Use the jumper wires to connect terminal No. 1 (red clip) to
the positive battery terminal and terminal No. 3 (blue clip) to
the negative battery terminal.
(4) Connect a digital volt meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the left bank
heated oxygen sensor (rear) output voltage.
Standard value: 0.6
− 1.0 volt
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Replace the ECM or PCM. Then go to Step 15.
NO : Replace the left bank heated oxygen sensor (rear).
Then go to Step 15.
STEP 15. 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 P0156 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01625 AB
BLUE
JUMPER
WIRES
BLACK
RED
WHITE
MB991316
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-412
DTC P0157: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 2)
AK103016
BLA
C
K
BLUE
YELLO
W
3 4
1 2
FROM MFI RELAY
LEFT BANK HEATED
OXYGEN SENSOR (REAR)
TO ECM
OR PCM
73 <M/T>*2
73 <A/T>*4
49 <M/T>*1
57 <A/T>*3
1
3
2
4
B-23
MU802665
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>
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
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
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)
Left Bank Heated Oxygen Sensor (rear) Circuit
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-413
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 73) <M/T> or PCM (terminal No. 73)
<A/T> from the output terminal (terminal No. 4) of
the left bank heated oxygen sensor (rear).
• Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with ECM (terminal No.
49) <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
left bank heated oxygen sensor (rear).
• The ECM <M/T> or PCM <A/T> checks for an
open circuit in the left bank heated oxygen sensor
(rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (rear) output voltage
stays low when air/fuel ratio is forced to be rich.
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
• 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
.
AK300058
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
AK300244
CONNECTORS: C-55, C-59 <A/T>
AD
PCM
C-55 (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-414
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Left bank heated oxygen sensor (rear) signal volt-
age has continued to be 0.15 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.
• Volume airflow sensor output frequency is 75 Hz
or more.
START
V
F
> =4.5V
2secs HAS PASSED
YES
YES
YES
NO
NO
NO
MALFUNCTION
MONITORING
CONDITIONS
YES
NO
MONITORING
CONDITIONS
+5V ON
AK301440
V
F
< 0.15V
10secs HAS PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
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