Mitsubishi Montero (2002-2004). Manual — part 620
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-177
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 117) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(rear).
• Terminal No. 2 of the right bank heated oxygen
sensor (rear) is grounded with PCM (terminal No.
96).
.
TECHNICAL DESCRIPTION
• The output signal of the right bank heated oxygen
sensor (front) is compensated by the output sig-
nal of the right bank heated oxygen sensor (rear).
• The PCM checks for an open circuit in the right
bank heated oxygen sensor (rear) output line.
.
DTC SET CONDITIONS
Check Conditions
• Engine coolant temperature is higher than 76°C
(169
°F).
• The right bank heated oxygen sensor (front) is
active.
• The cumulative volume airflow sensor output fre-
quency for every 2 seconds is higher than 4,000
Hz.
• Repeat 3 or more times: drive
*1
, stop
*2
.
Drive
*1
:
• Engine speed is higher than 1,500 r/min.
• Volumetric efficiency is higher than 40 per-
cent.
• Vehicle speed is higher than 30 km/h (18.7
mph).
• A total of more than 10 seconds have
elapsed with the above mentioned condi-
tions, and more than 2 seconds have
elapsed with the fuel shut off.
AK201275
CONNECTOR: C-14
C-14(GR)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK201049
D-14
AB
CONNECTOR: D-14
AK201049
CONNECTOR: D-116
D-116
AC
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
AK201052
E-112
AB
CONNECTOR: E-112
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-178
Stop
*2
:
• Vehicle speed is lower than 1.5 km/h (0.9
mph).
Judgement Criteria
• Change in the output voltage of the right bank
heated oxygen sensor (rear) is lower than 0.313
volt.
NOTE: Monitoring stops after fuel has been shut
off for more than 38 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Right bank heated oxygen sensor (rear) failed.
• PCM failed.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 69:
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
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
69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).
(4) Warm up the engine.
• After increasing the output voltage 0.15 volt or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.15 volt or less within 3 seconds.
(5) 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 : Replace the heated oxygen sensor (rear). Then go to
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 4
− Heated Oxygen Sensor
Monitor
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-179
DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1, sensor 2)
TO PCM
TO PCM
WHITE-
BL
ACK
WHITE-
BL
ACK
AK201134
RED
YELL
OW
-BL
ACK
YELL
OW
-BL
ACK
RED
RIGHT BANK HEATED
OXYGEN SENSOR (REAR)
4
1 2
3
B-22X
3
2
4
1
BATTERY
4
12
9
6
10
17
18
29
2
3 4
7 8
19 20
30 31
12
11
24
33 34 35
21
32
27
26
36 37
28
38
25
13
15
14
16
23
22
1
5
E-114
1
3
2
4
24
MFI
RELAY
POWERTRAIN
CONTROL
MODULE (PCM)
4
3
1 2
C-14
MU802665
Right Bank Heated Oxygen Sensor (rear) Heater Circuit
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-180
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 1) to the right bank heated oxygen sensor
(rear) heater.
• The PCM (terminal No. 24) controls continuity to
the right bank heated oxygen sensor (rear)
heater by turning the power transistor in the PCM
"ON" and "OFF".
.
BACKGROUND
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DTC SET CONDITIONS
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the right bank heated oxygen sensor (rear)
heater is on.
• Battery positive voltage is at between 11 and 16
volts.
Judgment Criteria
• Heater current of the right bank heated oxygen
sensor (rear) heater has continued to be lower
than 0.16 ampere or higher than 5.0 ampere for 4
seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Open or shorted right bank heated oxygen sen-
sor (rear) heater circuit.
• Open circuit in right bank heated oxygen sensor
(rear) heater.
• PCM failed.
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201275
CONNECTOR: C-14
C-14(GR)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201052
CONNECTOR: E-114
E-114
AC
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