Mitsubishi Montero (2002-2004). Manual — part 642
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-265
DIAGNOSIS
Required Special Tool:
• MD998464: Test Harness Set
STEP 1. Check harness connector C-15 at the left bank
heated oxygen sensor (rear) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-266
STEP 2. Check the left bank heated oxygen sensor (rear).
(1) Disconnect 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 (rear) sensor
side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 11
− 18 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 11 and 18 ohms [at
20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the left bank heated oxygen sensor (rear).
Then go to Step 12.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AKX01624
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
MD998464
BLUE
RED
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-267
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (rear) harness side connector C-15.
(1) Disconnect the connector C-15 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-22X at the MFI relay
for damage.
Q: Is the harness connector in good condition?
YES : Check harness connectors E-114 and D-116 at
intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection. If intermediate connectors E-
114 and D-116 are in good condition, repair harness
wire between MFI relay connector B-22X (terminal
No. 1) and left bank heated oxygen sensor (rear)
connector C-15 (terminal No. 1) because of open
circuit or short circuit to ground. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK201280
1
2
3
4
CONNECTOR: C-15
C-15(B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
AKX01498
C-15 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AZ
AK200951
2 1
3
4
B-22X
AB
CONNECTOR: B-22X
HARNESS
CONNECTOR:
COMPONENT SIDE
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-268
STEP 5. Measure the power supply voltage at PCM
connector D-132 by backprobing.
(1) Do not disconnect the connector D-132.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 18 and ground
by backprobing.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 8.
NO : Go to Step 6.
STEP 6. Check harness connector D-132 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK200938
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3
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9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
AK201413
D-132 HARNESS
CONNECTOR:
HARNESS SIDE
AB
AK200938
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
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