Mitsubishi Montero (2002-2004). Manual — part 606
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-121
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 109) from the output terminal (terminal
No. 4) of the right bank heated oxygen sensor
(front).
• Terminal No. 2 of the right bank heated oxygen
sensor (front) is grounded with PCM (terminal
No. 96).
.
TECHNICAL DESCRIPTION
• The right 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 right bank heated oxygen sensor
(front) begins to deteriorate, the 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 right bank heated oxygen
sensor (front). In addition, the PCM also checks
for an open circuit in the right bank heated oxy-
gen sensor (front) output line.
.
DTC SET CONDITIONS
Check Conditions
• 3 minutes or more have passed since the starting
sequence was completed.
• Right 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.
• Volume airflow sensor output frequency is 100 Hz
or more.
• At least 20 seconds have passed since fuel shut
off control was canceled.
• After the ignition switch is turned "ON" position,
the changes in the output voltage of the right
bank heated oxygen sensor (front) is lower than
0.078 volt.
• Monitoring time: 10 seconds.
Judgement Criteria
• Making the air/fuel ratio 15 percent for 10 sec-
onds richer does not result in raising the heated
oxygen sensor (front) output voltage beyond 0.2
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:)
• Right bank heated oxygen sensor (front) failed.
• Short circuit in right bank heated oxygen sensor
(front) output line.
• PCM failed.
AK201049
CONNECTOR: D-116
D-116
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-122
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MD998464: Test Harness
STEP 1. Using scan tool MB991502, check data list item 39:
Heated Oxygen Sensor Bank 1, Sensor 1 (right 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
39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front).
• Warm up the engine. When the engine is revved, the
output voltage should measure 0.6 to 1.0 volt.
• Warm up the engine. When the engine is idling, the out-
put 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.
AC003081 AB
16 PIN
MB991502
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-123
STEP 2. Check the right bank heated oxygen sensor
(front).
(1) Disconnect the right bank heated oxygen sensor (front)
connector B-07 and connect test harness special tool,
MD998464, to the connector on the right 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 right 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 right
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 : Go to Step 3.
NO : Replace the right bank heated oxygen sensor (front).
Then go to Step 5.
AK201274
1
2
3
4
CONNECTOR: B-07
B-07(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01625AC
BLUE
RED
BLACK
JUMPER
WIRES
WHITE
MD998464
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-124
STEP 3. Check connector B-07 at right bank heated
oxygen sensor (front) and connector D-135 at PCM for
damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 5.
AK201274
1
2
3
4
CONNECTOR: B-07
B-07(B)
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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