Mitsubishi Montero (2004+). Manual — part 214
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-343
STEP 3. Check connector C-15 at left bank heated oxygen
sensor (rear) and connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AC
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
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-344
STEP 4. Check for short circuit to ground between left
bank heated oxygen sensor (rear) connector C-15
(terminal No. 4) and PCM connector D-135 (terminal No.
116).
NOTE: Check harness after checking intermediate connector
E-112. IF intermediate connector is damaged, repair or replace
it. Refer to Group 00E, Harness Connector Inspection
.
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.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AC
HARNESS
CONNECTOR:
COMPONENT SIDE
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
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-345
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 P0157 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0158: Heated Oxygen Sensor Circuit High Voltage (bank 2, sensor 2)
WHITE
BL
ACK
BL
ACK
WHITE
BL
ACK
BL
ACK
BL
ACK
AK201137
TO PCM
FROM MFI RELAY
96
116
2
4
3
1
2
1
4 5 6
3
E-112
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
POWERTRAIN CONTROL
MODULE (PCM)
10
9
1
3
7
4
3
1 2
C-15
MU802605
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
Left Bank Heated Oxygen Sensor (rear) Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-346
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 116) 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.
96).
.
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.
.
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
.
AK201279
CONNECTOR: C-15
C-15(B)
AD
LEFT BANK
HEATED OXYGEN
SENSOR (REAR)
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
AK201049
CONNECTOR: D-116
D-116
AC
AK201049
D-14
AB
CONNECTOR: D-14
AK201052
E-112
AB
CONNECTOR: E-112
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