Mitsubishi Montero (2004+). Manual — part 192
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-255
STEP 3. Check harness connector C-14 at right bank
heated oxygen sensor (rear) and harness connector D-135
at PCM for damage.
Q: Is the harness connector in good condition?
YES : Replace the PCM.Then go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 4.
STEP 4. 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 P0139 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK201276
1
2
3
4
CONNECTOR: C-14
C-14(GR)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK200947
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-256
DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 2)
TO PCM
TO PCM
WHITE-
BL
ACK
WHITE-
BL
ACK
AK201134
RED
YELL
OW
-BL
ACK
YELL
OW
-BL
ACK
RED
RIGHT BANK HEATED
OXYGEN SENSOR (REAR)
4
1 2
3
B-22X
3
2
4
1
BATTERY
4
12
9
6
10
17
18
29
2
3 4
7 8
19 20
30 31
12
11
24
33 34 35
21
32
27
26
36 37
28
38
25
13
15
14
16
23
22
1
5
E-114
1
3
2
4
24
MFI
RELAY
POWERTRAIN
CONTROL
MODULE (PCM)
4
3
1 2
C-14
MU802665
Right Bank Heated Oxygen Sensor (rear) Heater Circuit
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-257
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the right bank heated oxygen sensor
(rear) heater.
• The PCM (terminal No. 24) controls continuity to
the right bank heated oxygen sensor (rear)
heater by turning the power transistor in the PCM
"ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor heater (rear) 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
.
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201275
CONNECTOR: C-14
C-14(GR)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201052
CONNECTOR: E-114
E-114
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-258
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 right bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is at between 11 and 16.5
volts.
Judgment Criteria
• The right bank heated oxygen sensor (rear)
heater current has continued to be lower than
0.16 ampere or higher than 5.0 ampere for 4 sec-
onds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Right bank heated oxygen sensor (reat) deterio-
rated.
• Open or shorted right bank heated oxygen sen-
sor (rear) heater circuit or harness damage.
• Connector damage.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 5.0A
AK302937
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