Mitsubishi Montero (2002-2004). Manual — part 638
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-249
STEP 14. Check the left bank heated oxygen sensor (rear).
(1) Disconnect the left bank heated oxygen sensor (rear)
connector C-15 and connect test harness special tool,
MD998464, 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 (rear).
(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 (rear) 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 (rear).
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 P0156 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AKX01625AC
BLUE
RED
BLACK
JUMPER
WIRES
WHITE
MD998464
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-250
DTC P0157: Heated Oxygen Sensor Circuit Low Voltag (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)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-251
.
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
(terminalNo. 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.
.
DTC SET CONDITIONS
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Left bank heated oxygen sensor (rear) signal volt-
age has continued to be 0.15 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.
• Volume airflow sensor output frequency is 100 Hz
or more.
• At least 20 seconds have passed since fuel shut
off control was canceled.
• The left bank heated oxygen sensor (front) out-
puts 0.5 volts or more.
• After the ignition switch is turned ON, the
changes in the output voltage of the left bank
heated oxygen sensor (rear) is lower than 0.078
volt.
AK201279
CONNECTOR: C-15
C-15(B)
AB
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AK201049
CONNECTOR: D-116
D-116
AC
AK201052
E-112
AB
CONNECTOR: E-112
AK201038AF
CONNECTOR: D-135
PCM
D-135(GR)
AK201049
D-14
AB
CONNECTOR: D-14
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-252
• Monitoring time: 10 seconds.
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the left bank
heated oxygen sensor (rear) output voltage
beyond 0.15 volt.
• 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 (rear) failed.
• Short circuit in left bank heated oxygen sensor
(rear) output line.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MB998464: Test Harness Set
STEP 1. Using scan tool MB991502, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left bank).
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
59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
• Warming up the engine. When the engine is revved, the
output voltage should repeat 0 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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