Mitsubishi Montero Sport (2004+). Manual — part 196
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-197
STEP 4. Check for short circuit to ground and harness
damage between right bank heated oxygen sensor (front)
connector A-07 (terminal No. 4) and PCM connector C-91
(terminal No. 72).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 5.
NO : Repair it. Then go to Step 5.
STEP 5. 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 P0131 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
AK200490
1
2
3
4
A-07(B)
AB
CONNECTOR: A-07
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-198
DTC P0132: Heated Oxygen Sensor Circuit High Voltage (bank 1, sensor 1)
BLA
CK
BLA
CK
WHITE
BLA
CK-RED
AK000444
Right Bank Heated Oxygen Sensor (front) Circuit
4
POWERTRAIN CONTROL MODULE (PCM)
12
2
3
1
18
57
72
RIGHT BANK HEATED OXYGEN
SENSOR (FRONT)
TO PCM
FROM MFI RELAY
C-90
C-91
1 2
3 4
A-07
MU802605
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)
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
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
JOINT
CONNECTOR (4)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-199
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 72) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(front).
• Terminal No. 2 of the right bank heated oxygen
sensor (front) is grounded with PCM (terminal
No. 57).
.
TECHNICAL DESCRIPTION
• The right bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the PCM.
• When the right bank heated oxygen sensor
(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.
• The PCM forcibly varies the air/fuel mixture to
make it leaner and richer, and checks the
response speed of the right bank heated oxygen
sensor (front). In addition, the PCM also checks
for an open circuit in the right bank heated oxy-
gen sensor (front) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Right bank heated oxygen sensor (front) output volt-
age is over specified range.
.
MONITOR EXECUTION
Continuous
.
AK200489
A-07(B)
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
CONNECTOR: A-07
AK103912AB
CONNECTOR: C-71
C-71
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-200
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
• Misfire monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
.
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
Judgment Criteria
• Right bank heated oxygen sensor (front) 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: )
• Short circuit in right bank heated oxygen sensor
(front) 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
AK301437
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