Mitsubishi Montero Sport (2004+). Manual — part 234
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-349
DTC P0158: Heated Oxygen Sensor Circuit High Voltage (bank 2, sensor 2)
AK303392
Left Bank Heated Oxygen Sensor (rear) Circuit
BL
ACK
BL
ACK
BL
ACK
BL
ACK
WHITE
BL
ACK
BL
ACK
BL
ACK
WHITE
WHITE
BL
ACK
-RED
BL
ACK
-RED
POWERTRAIN CONTROL MODULE (PCM)
1
10
15
2
11
3
12
4
13 14
5
16
6
17
7
18
8
19
9
20
E-44
73
57
19
5
16
10
12
8
2
7
4
2
3
1
C-91
C-90
FROM MFI RELAY
TO PCM
LEFT BANK HEATED
OXYGEN SENSOR (REAR)
1
10
15
2
11
3
12
4
13 14
5
16
6
17
7
18
8
19
9
20
E-45
E-45
47
41
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58
59
60 61 62 63
64 65 66
C-90
(MU803781)
1
10
2 3 4 5 6 7 8 9
11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
C-71
71
76
77
72 73 74
75
79 80
78
81
87 88
89
91
90
92
97
98
82
93
83
94
84 85
95
86
96
C-91
(MU803782)
1 2
3 4
E-48
MU802605
6
10
2
7
8
3 4 5
9
11 12 13
1
C-79
MU801553
JOINT
CONNECTOR (4)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-350
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 73) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(rear).
• Terminal No. 2 of the left bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
57).
.
TECHNICAL DESCRIPTION
• The output signal of the left bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the left bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the left
bank heated oxygen sensor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (rear) output voltage
is over specified range.
AK200497
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
E-48(B)
AB
CONNECTOR: E-48
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
AK200018 AB
CONNECTOR: E-44
E-44
AK103912AB
CONNECTOR: C-71
C-71
AK103911AC
CONNECTOR: C-79
C-79
AK200018 AC
CONNECTOR: E-45
E-45(B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-351
.
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)
• Heated oxygen sensor heater (front) monitor
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 minutes or more have passed since the starting
sequence was completed.
Judgment Criteria
• Left bank heated oxygen sensor (rear) output
voltage has continued to be 1.2 volts or higher for
2 seconds.
.
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:)
• Open circuit in left bank heated oxygen sensor
(rear) output line.
• Connector damage.
• PCM failed.
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
2secs HAVE PASSED?
OUTPUT VOLTAGE > 1.2V
NO
YES
MONITORING
CONDITIONS
AK301441
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-352
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Check harness connector E-48 at left bank heated
oxygen sensor (rear) and harness connector C-91 at PCM
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 3.
AK200498
1
2
3
4
E-48(B)
AB
CONNECTOR: E-48
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
AK104028
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
AB
CONNECTOR: C-91
C-91(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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