Mitsubishi Montero (2002-2004). Manual — part 603
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-109
STEP 3. Measure the sensor output voltage at PCM
connector D-135 by backprobing
(1) Do not disconnect the connector D-135.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 109 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 4.
NO : Go to Step 6.
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109
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CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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100 101102103
104
105106
107108109
110111112
113114
115116117
118119120
AB
D-135 HARNESS
CONNECTOR:
HARNESS SIDE
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-110
STEP 4. Check harness connector B-07 at right bank
heated oxygen sensor (front) and harness connector D-
135 at PCM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 15.
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CONNECTOR: B-07
B-07(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-111
STEP 5. Using scan tool MB991502, check data list item 39:
Right Bank 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).
• 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 : Replace the PCM. Then go to Step 15.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-112
STEP 6. Check harness connector B-07 at right bank
heated oxygen sensor (front) and harness connector D-
135 at PCM for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between right bank heated
oxygen sensor (front) connector B-07 (terminal No. 4)
and PCM connector D-135 (terminal No. 109)
because of open circuit or harness damage. Then go
to Step 15.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 15.
AK201274
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2
3
4
CONNECTOR: B-07
B-07(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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108
109
110
111
112
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116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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