Mitsubishi Montero (2002-2004). Manual — part 629
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-213
STEP 2. Check for short circuit to power supply 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 : Replace the PCM. Then go to Step 3.
NO : Repair it. Then go to Step 3.
STEP 3. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Trouble Code Diagnosis
− OBD-II Drive Cycle
− Procedure 6 − Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0152 set?
YES : Repeat the troubleshooting.
NO : The procedure is complete.
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)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-214
DTC P0153: Heated Oxygen Sensor Circuit Slow Response (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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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-215
.
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 PCM (terminal
No. 96).
.
TECHNICAL DESCRIPTION
• The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the PCM.
• When the left bank heated oxygen sensor (front)
begins to deteriorate, the left bank heated oxygen
sensor signal response becomes poor.
• The PCM forcibly 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
• Engine coolant temperature is higher than 50°C
(122
°F).
• Engine speed is at between 1,250 and 3,000 r/
min.
• Volumetric efficiency is at between 24 and 65
percent.
• Under the closed loop air/fuel control.
• The throttle valve is open.
• Short-term fuel trim is at between −30 and +25
percent.
• More than 3 seconds have elapsed after the
abovementioned conditions have been met.
• The PCM monitors for this condition for 7 cycles
of 12 seconds each during the drive cycle.
Judgment Criteria
• The left bank heated oxygen sensor (front) sends
"lean" and "rich" signals alternately 11 times or
less for 12 seconds.
NOTE: If the sensor switching frequency is lower
than the Judgment Criteria due to the MUT-II OBD-II
test Mode
−
H02S Test Results, it is assumed that
the heated oxygen sensor has deteriorated. If it is
higher, it is assumed that the harness is damaged or
has a short circuit.
If the heated oxygen sensor signal voltage has not
changed even once (lean/rich) after the DTC was
erased, the sensor switch time will display as 0 sec-
onds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Left bank heated oxygen sensor (front) deterio-
rated.
• PCM failed.
AK201049
CONNECTOR: D-116
D-116
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-216
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
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).
(4) Warm up the engine, 2,500 r/min.
• Output voltage repeats 0.4 volt or less and 0.6 − 1.0 volt
10 times or more within 10 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 (front). 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 P0153 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
ACX01539
16-PIN
MB991502
AC
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