Mitsubishi Montero (2002-2004). Manual — part 633
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-229
STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (front) harness side connector B-26.
(1) Disconnect the connector B-26 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 : Repair harness wire between MFI relay connector B-
22X (terminal No. 1) and left bank heated oxygen
sensor (front) connector B-26 (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.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AKX01496
B-26 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AR
AK200951
2 1
3
4
B-22X
AB
CONNECTOR: B-22X
HARNESS
CONNECTOR:
COMPONENT SIDE
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-230
STEP 5. Meaure 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. 10 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
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)
AK201411
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
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)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-231
STEP 7. Check for open circuit or short circuit to ground
between left bank heated oxygen sensor (front) connector
B-26 (terminal No. 3) and PCM connector D-132 (terminal
No. 27).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.
AK201278
1
2
3
4
CONNECTOR: B-26
B-26(GR)
AB
HARNESS
CONNECTOR:
COMPONENT
SIDE
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-232
STEP 8. Check harness connector D-132 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
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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