Mitsubishi Eclipse. Manual — part 196
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-277
DTC P0136: Heated Oxygen Sensor Circuit (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-278
.
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) 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
• 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-279
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.
• 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
AK301440
V
F
< 0.15V
10secs HAS PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-280
Judgment Criteria
• Input voltage supplied to the ECM <M/T> or PCM
<A/T> interface circuit is higher than 4.5 volts
when 5 volts is applied to the heated oxygen sen-
sor (rear) output line via a resistor.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
− Other Monitor
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Heated oxygen sensor (rear) failed.
• Open circuit in heated oxygen sensor (rear) out-
put line, or harness damage.
• Open circuit in heated oxygen sensor (rear)
ground line, or harness 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
• MB991658: Test Harness
STEP 1. Using scan tool MB991958, check data list item 59:
Heated Oxygen Sensor (rear).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
59, Heated Oxygen Sensor (rear).
• Warming up the engine. When the engine is revved, the
output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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