Mitsubishi Montero (2002-2004). Manual — part 623
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-189
STEP 12. 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 P0141 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0150: Heated Oxygen Sensor Circuit High 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)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-190
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 108) from the output terminal (terminal
No. 4) of the left bank heated oxygen sensor
(front).
• Terminal No. 2 of the left bank heated oxygen
sensor (front) is grounded with or PCM (terminal
No. 96).
.
TECHNICAL DESCRIPTION
• The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts that data to voltage, and
sends it to the PCM.
• When the left bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response deteriorates also.
• The PCM varies the air/fuel mixture to make it
leaner and richer, and checks the response
speed of the left bank heated oxygen sensor
(front). In addition, the PCM also checks for an
open circuit in the left bank heated oxygen sensor
(front) output line.
.
DTC SET CONDITIONS
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Left bank heated oxygen sensor (front) signal
voltage has continued to be 0.2 volt or lower.
• Engine coolant temperature is higher than 76°C
(169
°F).
• Engine speed is higher than 1,200 r/min.
• Volumetric efficiency is higher than 25 percent.
• Monitoring time: 7 seconds.
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
AK201049
CONNECTOR: D-116
D-116
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-191
Judgment Criteria
• Input voltage supplied to the PCM interface circuit
is higher than 4.5 volts when 5 volts is applied to
the left bank heated oxygen sensor (front) output
line.
• The PCM monitors for this condition once during
the drive cycle.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Left bank heated oxygen sensor (front) deterio-
rated.
• Open circuit in left bank heated oxygen sensor
(front) output line.
• Open circuit in left bank heated oxygen sensor
(front) ground line.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MB991316: Test Harness
STEP 1. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
• Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
• Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 volt and 0.6 to 1.0 volt
alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
NO : Go to Step 2.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-192
STEP 2. Measure the sensor output voltage at left bank
heated oxygen sensor (front) connector B-26 by
backprobing
(1) Do not disconnect the connector B-26.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 4 and ground by
backprobing.
• Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 3.
NO : Go to Step 7.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01538
1 2
4
3
AP
B-26 HARNESS
CONNECTOR:
HARNESS SIDE
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