Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 228
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-111
STEP 1. Using scan tool MB991502, check data list item 39:
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
•
Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
•
Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 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.
STEP 2. Check the sensor output voltage at right bank
heated oxygen sensor (front) connector B-27 by
backprobing.
(1) Do not disconnect the connector B-27.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 4 and ground by
backprobing.
•
Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 3.
NO : Go to Step 7.
AKX01177
16 PIN
MB991502
AB
AKX01541AC
1 2
3 4
B-27 CONNECTOR
HARNESS
SIDE VIEW
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-112
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.
(3) Measure the voltage between terminal 72 and ground by
backprobing.
•
Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 4.
NO : Go to Step 6.
STEP 4. 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 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
AK000238
71 72
73 74
78
80 81
79
82 83 84 85 86 87 88 89
75 76
91 92 93
94 95
96
98
99
97
AK000238AC
<M/T>
C-62 CONNECTOR
HARNESS SIDE VIEW
77
90
100
AKX01533
AKX01533
7172 73 74
75 76 77
78 79 80 81 82 83 84 85 86 87 88 89
90 91
92 93 94
95 96
97 98
C-59 CONNECTOR
HARNESS SIDE VIEW
AF
<A/T>
AK000208 AB
CONNECTOR : B-27
AK000225
CONNECTOR : C-62<M/T>, C-59<A/T>
C-59
C-62
PCM<A/T>
ECM<M/T>
AL
![](/vehicles/winoney/isene/butrele/whis.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-113
STEP 5. Using scan tool MB991502, check data list item 39:
Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
•
Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
•
Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 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 : Replace the ECM or PCM. Then go to Step 15.
STEP 6. 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 : Repair harness wire between right bank heated
oxygen sensor (front) connector B-27 terminal 4 and
ECM connector C-62 terminal 72 <M/T> or PCM
connector C-59 terminal 72 <A/T> because of open
circuit or harness damage. Then go to Step 15.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
AKX01177
16 PIN
MB991502
AB
AK000208 AB
CONNECTOR : B-27
AK000225
CONNECTOR : C-62<M/T>, C-59<A/T>
C-59
C-62
PCM<A/T>
ECM<M/T>
AL
![](/vehicles/winoney/isene/butrele/xcindo.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-114
STEP 7. Check connector B-27 at right bank heated
oxygen sensor (front) for damage.
Q: Is the connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
STEP 8. Check the continuity at right bank heated oxygen
sensor (front) harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness
side.
(2) Check for the continuity between terminal 2 and ground.
•
Should be less than 2 ohm.
Q: Is the continuity normal?
YES : Go to Step 11.
NO : Go to Step 9.
STEP 9. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 15.
AK000208 AB
CONNECTOR : B-27
AK000239AB
B-27 HARNESS
SIDE CONNECTOR
2 1
4 3
AK000225
CONNECTOR : C-58<M/T>, C-55<A/T>
C-55
C-58
PCM<A/T>
ECM<M/T>
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