Mitsubishi Montero (2002-2004). Manual — part 626
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-201
STEP 12. Check for harness damage between left bank
heated oxygen sensor (front) connector B-26 (terminal No.
2) and PCM connector D-135 (terminal No. 96).
Q: Is the harness wire in good condition?
YES : Go to Step 13.
NO : Repair it. Then go to Step 15.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
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)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-202
STEP 13. Check for short circuit to ground and harness
damage between left bank heated oxygen sensor (front)
connector B-26 (terminal No. 4) and PCM connector D-135
(terminal No. 108).
Q: Is the harness wire in good condition?
YES : Go to Step 14.
NO : Repair it. Then go to Step 15.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
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)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-203
STEP 14. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-26 and connect test harness special tool,
MB991316, to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant 80
°C (176°F) or
higher.
CAUTION
Be very careful when connecting the jumper wires; incor-
rect connection can damage the left bank heated oxygen
sensor (front).
(3) Use the jumper wires to connect terminal No. 1 (red clip) to
the positive battery terminal and terminal No. 3 (blue clip) to
the negative battery terminal.
(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 left bank
heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Replace the PCM. Then go to Step 15.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 15.
STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 6
− Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0150 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01625 AB
BLUE
JUMPER
WIRES
BLACK
RED
WHITE
MB991316
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-204
DTC P0151: Heated Oxygen Sensor Circuit Low Voltage (bank 2, sensor 1)
BL
ACK
BL
ACK
BL
ACK
TO PCM
FROM MFI RELAY
WHITE
AK201135
96
108
4
3
1
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
11
9
7
2
4
3
1 2
B-26
MU802665
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 (front) Circuit
9192
939495
96979899
100
105
113114
115116117
118119120
106
107108109
110111112
101102103
104
D-135
(MU803805)
AK201277
CONNECTOR: B-26
B-26(GR)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
AK201049
D-14
AB
CONNECTOR: D-14
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