Mitsubishi Eclipse. Manual — part 442
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-311
DTC P0139: Heated Oxygen Sensor Circuit Slow Responce (bank 1, sensor 2)
AK103015
BLA
CK
BLA
CK
PINK
BLUE
3 4
1 2
FROM MFI RELAY
RIGHT BANK HEATED
OXYGEN SENSOR (REAR)
TO ECM
OR PCM
74<M/T>*2
74<A/T>*4
49<M/T>*1
57<A/T>*3
1
3
2
4
B-28
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)
Right Bank Heated Oxygen Sensor (rear) Circuit
S142
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-312
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 74) <M/T> or PCM (terminal No. 74)
<A/T> from the output terminal (terminal No. 4) of
the right bank heated oxygen sensor (rear).
• Terminal No. 2 of the right 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 right bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).
• The ECM <M/T> or PCM <A/T> checks for an
open circuit in the right bank heated oxygen sen-
sor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (rear) output volt-
age does not change during specified go/stop
operations including fuel cut are repeated.
.
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
.
AK300075
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-28
AB
B-28 (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-313
DTC SET CONDITION
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 76°C
(169
°F).
• The right bank heated oxygen sensor (front) is
active.
• The cumulative volume airflow sensor output fre-
quency is higher than 4,000 Hz.
• Repeat 3 or more times: drive
*1
, stop
*2
.
Drive
*1
:
• Engine speed is higher than 1,500 r/min.
• Volumetric efficiency is higher than 40 per-
cent.
• Vehicle speed is higher than 30 km/h (19
mph).
• A total of more than 10 seconds have
elapsed with the above mentioned condi-
tions, and more than 2 seconds have
elapsed with the fuel shut off.
Stop
*2
:
• Vehicle speed is lower than 1.5 km/h (1.0
mph).
Judgement Criteria
• Change in the output voltage of the right bank
heated oxygen sensor (rear) is lower than 0.312
volt.
NOTE: Monitoring stops after fuel has been shut
off for more than 38 seconds.
.
END
YES
NO
NO
NO
START
MONITORING
CONDITION
YES
MALFUNCTION
GOOD
F1: COUNTER OF A DRIVING STATE.
F2: COUNTER OF A STOP STATE.
OUTPUT VOLTAGE
CHANGE < 0.313 V
GO/STOP OPERATION
FOR SPECIFIED TIMES
YES
AK301442
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-314
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Right bank heated oxygen sensor (rear) failed.
• ECM failed. <M/T>
• PCM failed. <A/T>
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• MB991316:Test Harness
STEP 1. Using scan tool MB991958, check data list item 69:
Heated Oxygen Sensor Bank 1, Sensor 2 (right 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
69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
(4) Warm up the engine.
• After increasing the output voltage 0.15 volt or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.15 volt or less within 3 seconds.
(5) 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 : Replace the right bank heated oxygen sensor (rear).
Then go to Step 2.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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