Mitsubishi Montero (2004+). Manual — part 177
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-195
STEP 2. Check for short circuit to power supply between
right bank heated oxygen sensor (front) connector B-07
(terminal No. 4) and PCM connector D-135 (terminal No.
109).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 3.
NO : Repair it. Then go to Step 3.
STEP 3. Perform 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 P0132 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
AK201274
1
2
3
4
CONNECTOR: B-07
B-07(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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-196
DTC P0133: Heated Oxygen Sensor Circuit Slow Response (bank 1, sensor 1)
BL
ACK
BL
ACK
BL
ACK
TO PCM
FROM MFI RELAY
WHITE
AK201131
96
109
4
3
1
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
8
9
7
1 2
4
3
B-07
MU802605
2
1
12
23 24 25 26
2
13
3
14
4
15
5
16
6
17
7
18
8
19
9
20 21 22
27 28 29 30 31 32 33
10 11
D-116
1
5
7 8
3 4
9 10
2
6
D-14
MU801335
Right Bank Heated Oxygen Sensor (front) Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
AK201273
CONNECTOR: B-07
B-07(B)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
AK201049
D-14
AB
CONNECTOR: D-14
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-197
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 109) 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. 96).
.
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) rich/lean
switching frequency is under specified value.
.
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
• 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
• Accelerator pedal position sensor
.
AK201049
CONNECTOR: D-116
D-116
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-198
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 50°C
(122
°F).
• Engine speed is between 1,250 and 3,000 r/min.
• Volumetric efficiency is between 24 and 65 per-
cent.
• Under the closed loop air/fuel control.
• The accelerator pedal is not closed.
• Short-term fuel trim is between −30 and +25 per-
cent.
• More than 3 seconds have elapsed after the
abovementioned conditions have been met.
• The PCM monitors for this condition for 7 cycles
of 12 seconds each during the drive cycle.
Judgment Criteria
• The right bank heated oxygen sensor (front)
sends "lean" and "rich" signals alternately 11
times or less for 12 seconds.
NOTE: If the sensor switching frequency is lower
than the Judgment Criteria due to the MUT-III OBD-II
test Mode
−
H02S Test Results, it is assumed that
the heated oxygen sensor has deteriorated. If it is
higher, it is assumed that the harness is damaged or
has a short circuit.
If the heated oxygen sensor signal voltage has not
changed even once (lean/rich) after the DTC was
erased, the sensor switch time will display as 0 sec-
ond.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Right bank heated oxygen sensor (front) deterio-
rated.
• Connector damage.
F1: THRESHOLD VALUE FOR REAL-TIME SWITDHING FREQUENCY
F0: THRESHOLD VALUE FOR AVERAGE SWITDHING FREQUENCY
START
MONITORING
CONDITIONS
MALFUNCTION
GOOD
END
NO
NO
YES
YES
Ff < F0
CALCULATE AVERAGE SWITCHING
FREQUENCY (Ff) OVER SPECIFIED TIMES
AK302932
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