Mitsubishi Eclipse. Manual — part 200
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-293
STEP 13. Check the heated oxygen sensor (rear).
(1) Disconnect the heated oxygen sensor (rear) connector
C-23 and connect test harness special tool, MB991658, to
the connector on the 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 heated oxygen sensor
(rear).
(3) Use the jumper wires to connect terminal No. 5 to the
positive battery terminal and terminal No. 6 to the negative
battery terminal.
(4) Connect a digital volt meter between terminal No. 3 and
terminal No. 4.
(5) While repeatedly revving the engine, measure the 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 14.
NO : Replace the heated oxygen sensor (rear). Then go to
Step 14.
AK300412
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
C-54 (GR)
CONNECTOR: C-54 <A/T>
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300405
2
1
6 5 4 3
AB
C-23
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: C-23
HARNESS
CONNECTOR:
HARNESS SIDE
AK000122
JUMPER
WIRES
MB991658
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-294
STEP 14. 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 P0136 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0137: Heated Oxygen Sensor Circuit Low 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-295
.
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 stays
low when air/fuel ratio is forced to be rich. The
above procedure is repeated when oxygen sen-
sor 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
.
AK300054AB
C-23
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: C-23
AK300060
ECM
CONNECTOR: C-60 <M/T>
AE
C-60 (G)
AK300060AB
C-54 (GR)
PCM
CONNECTOR: C-54 <A/T>
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-296
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Heated oxygen sensor (rear) signal voltage 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 88 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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