Mitsubishi Montero Sport (2004+). Manual — part 211
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-257
STEP 3. 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 P0138 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-258
DTC P0139: Heated Oxygen Sensor Circuit Slow Response (bank 1 sensor 2)
AK000458
Right Bank Heated Oxygen Sensor (rear) Circuit
1 2
3 4
BLA
CK
BLA
CK
BLA
CK
BLA
CK
WHITE
BLA
CK
BLA
CK
BLA
CK
WHITE
WHITE
BLA
CK-RED
BLA
CK-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
E-47
MU802665
74
57
20
2
11
20
12
4
5
13
4
2
3
1
C-91
C-90
FROM MFI RELAY
TO PCM
RIGHT 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)
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-259
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 74) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(rear).
• Terminal No. 2 of the right bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
57).
.
TECHNICAL DESCRIPTION
• The output signal of the right bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the right
bank heated oxygen sensor (rear) output line.
.
AK103912AB
CONNECTOR: C-71
C-71
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
AK200018 AB
CONNECTOR: E-44
E-44
AK103911AC
CONNECTOR: C-79
C-79
AK200018 AC
CONNECTOR: E-45
E-45(B)
AK200491
E-47(GR)
AB
CONNECTOR: E-47
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-260
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (rear) output volt-
age does not change during specified go/stop
operations including fuel cut are repeated.
.
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
.
END
YES
NO
NO
NO
START
MONITORING
CONDITION
YES
MALFUNCTION
GOOD
F1: COUNTER OF A DRIVING STATE.
F2: COUNTER OF A STOP STATE.
OUTPUT VOLTAGE
CHANGE < 0.313 V
GO/STOP OPERATION
FOR SPECIFIED TIMES
YES
AK301442
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