Mitsubishi Montero Sport (2004+). Manual — part 194
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-189
STEP 10. Check the right bank heated oxygen sensor
(front).
(1) Disconnect the right bank heated oxygen sensor (front)
connector A-07 and connect test harness special tool,
MD998464, to the connector on the right bank heated
oxygen sensor (front) side.
(2) Warm up the engine until engine coolant 80
°C (176°F) or
higher.
(3) Perform a tracing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital volt meter between terminal No. 2 (black
clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the right
bank heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wire;
incorrect connection can damage the oxygen sensor.
• Be careful the heater is broken when voltage of beyond
8 volts is applied to the oxygen sensor heater.
NOTE: If the sufficiently high temperature (of approximate
400
°
C or more) is not reached although the oxygen sensor
is normal, the output voltage would be possibly low
although the rich air-fuel ratio. Therefore, if the output volt-
age is low, use a jumper wire to connect the terminal No.1
(red clip of special tool) and the terminal No. 3 (blue clip of
special tool) of the oxygen sensor with a (+) terminal and (-)
terminal of 8 volts power supply respectively, then check
again.
Q: Is the voltage at the standard value?
YES : Replace the PCM. Then go to Step 11.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 11.
AK200490
1
2
3
4
A-07(B)
AB
CONNECTOR: A-07
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MD998464
WHITE
BLACK
AL
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-190
STEP 11. 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 P0130 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
DTC P0131: Heated Oxygen Sensor Circuit Low 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-191
.
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 stays low when air/fuel ratio is forced to be
rich. The above procedure is repeated when oxy-
gen sensor is inactive.
.
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-192
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
.
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