Mitsubishi Eclipse. Manual — part 425
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-243
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the ECM (ter-
minal No. 72) <M/T> or PCM (terminal No. 72)
<A/T> from the output terminal (terminal No. 4) of
the right bank heated oxygen sensor (front).
• Terminal No. 2 of the right bank heated oxygen
sensor (front) is grounded with ECM (terminal
No. 49) <M/T> or PCM (terminal No. 57) <A/T>.
.
TECHNICAL DESCRIPTION
• The right bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the ECM
<M/T> or PCM <A/T>.
• When the right bank heated oxygen sensor
(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.
• The ECM <M/T> or PCM <A/T> forcibly varies
the air/fuel mixture to make it leaner and richer,
and checks the response speed of the right bank
heated oxygen sensor (front). In addition, the
ECM <M/T> or PCM <A/T> also checks for an
open circuit in the right bank heated oxygen sen-
sor (front) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output volt-
age is over specified range.
.
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
.
AK300057
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
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-244
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
Judgment Criteria
• Right bank heated oxygen sensor (front) output
voltage has continued to be 1.2 volts or higher for
2 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnosis Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Short circuit in right bank heated oxygen sensor
(front) output line.
• ECM failed. <M/T>
• PCM failed. <A/T>
• Connector damage.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
2secs HAVE PASSED?
OUTPUT VOLTAGE > 1.2V
NO
YES
MONITORING
CONDITIONS
AK301437
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-245
STEP 1. Check connector B-27 at right bank heated
oxygen sensor (front) and connector C-62 at ECM <M/T> or
connector C-59 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 3.
AK300409
1
2
3
4
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
HARNESS CONNECTOR:
COMPONENT SIDE
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-246
STEP 2. Check for short circuit to power supply between
right bank heated oxygen sensor (front) connector B-27
(terminal No. 4) and ECM connector C-62 (terminal No. 72)
<M/T> or PCM connector C-59 (terminal No. 72) <A/T>.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then go to Step 3.
NO : Repair it. Then go to Step 3.
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
AK300409
1
2
3
4
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
B-27 (B)
CONNECTOR: B-27
HARNESS CONNECTOR:
COMPONENT SIDE
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