Mitsubishi Eclipse. Manual — part 468
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-415
• At least 20 seconds have passed since fuel shut
off control was canceled.
• The left bank heated oxygen sensor (front) out-
puts 0.5 volts or more.
• Monitoring time: 10 seconds.
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the heated
oxygen sensor (rear) output voltage beyond 0.15
volt.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Left bank heated oxygen sensor (rear) failed.
• Short circuit in left bank heated oxygen sensor
(rear) 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
• 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 (left 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-416
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear)
connector B-23 and connect test harness special tool,
MB991316, to the connector on the left bank 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 right bank heated oxygen
sensor (rear).
(3) Use the jumper wires to connect terminal No. 1 (red clip) to
the positive battery terminal and terminal No. 3 (blue clip) to
the negative battery terminal.
(4) Connect a digital volt meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the left bank
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 : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (rear).
Then go to Step 5.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01625 AB
BLUE
JUMPER
WIRES
BLACK
RED
WHITE
MB991316
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-417
STEP 3. Check connector B-23 at left bank heated oxygen
sensor (rear) 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 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5.
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
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-418
STEP 4. Check for short circuit to ground between left
bank heated oxygen sensor (rear) connector B-23
(terminal No. 4) and ECM connector C-62 (terminal No. 73)
<M/T> or PCM connector C-59 (terminal No. 73) <A/T>.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then go to Step 5.
NO : Repair it. Then go to Step 5.
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
AK300410
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR: B-23
AB
B-23 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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