Mitsubishi Eclipse. Manual — part 463
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-395
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.
• 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) <3.0L>
13B-396
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 left bank heated
oxygen sensor (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: )
• Left bank heated oxygen sensor (rear) failed.
• Open or shorted circuit in left bank heated oxy-
gen sensor (rear) output line, or harness dam-
age.
• Open circuit in left bank heated oxygen sensor
(rear) ground line, or harness damage.
• 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 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left 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 Bank 2, Sensor 2 (let 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-397
STEP 2. Check the sensor output voltage at left bank
heated oxygen sensor (rear) connector B-23 by
backprobing.
(1) Do not disconnect the connector B-23.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 4 and ground by
backprobing.
• 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 measured voltage between 0.6 and 1.0 volt?
YES : Go to Step 3.
NO : Go to Step 7.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01538AM
1 2
3 4
B-23 HARNESS
CONNECTOR:
HARNESS SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-398
STEP 3. Check the sensor output voltage at ECM
connector C-62 <M/T> or PCM connector C-59 <A/T> by
backprobing.
(1) Do not disconnect the connector C-62 <M/T> or C-59
<A/T>.
(2) Start the engine and run at idle.
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
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
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