Mitsubishi Eclipse. Manual — part 459
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-379
STEP 11. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Replace the ECM or PCM. Then go to Step 12.
NO : Repair or replace it. Then go to Step 12.
STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0154 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK300443
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
CONNECTOR: C-51 <M/T>
C-51 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-380
DTC P0155: Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1)
AK101601
3 4
1 2
RED
-
WHITE
RED
-
WHITE
RED
-
WHITE
RED
BROWN-
WHITE
BATTERY
1
2
4
3
LEFT BANK HEATED
OXYGEN SENSOR (FRONT)
B-24
MU802605
1
2
3
4
TO ECM
OR PCM
TO ECM
OR PCM
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
3
MFI
RELAY
C-51 <M/T>, C-52 <A/T>
(MU803784)
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24 25
26 27 28 29
3132 33
34 35
1
10
Left Bank Heated Oxygen Sensor (front) Heater Circuit
3 4
1 2
A-18X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-381
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 4) to the left bank heated oxygen sensor
(front) heater.
• The ECM (terminal No. 3) <M/T> or PCM (termi-
nal No. 3) <A/T> controls continuity to the left
bank heated oxygen sensor (front) heater by
turning the power transistor in the ECM <M/T> or
PCM <A/T> "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The ECM <M/T> or PCM <A/T> checks whether
the heater current is within a specified range
when the heater is energized.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor heater (front) cur-
rent is out of specified range when engine coolant
temperature is over 20
°C (68°F).
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Engine coolant temperature sensor
.
AK300061
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-24
AB
B-24 (B)
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300244
CONNECTOR: C-52 <A/T>
AC
PCM
C-52 (GR)
AK300091
CONNECTOR: C-51 <M/T>
ECM
AF
C-51 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-382
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the left bank heated oxygen sensor (front)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• Heater current of the left bank heated oxygen
sensor (front) heater has continued to be lower
than 0.16 ampere or higher than 7.5 ampere for 4
seconds.
.
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: )
• Open or shorted left bank heated oxygen sensor
(front) heater circuit harness damage.
• Open circuit in left bank heated oxygen sensor
(front) heater.
• ECM failed. <M/T>
• PCM failed. <A/T>
• Connector damage.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 7.5A
AK301439
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