Mitsubishi Montero (2002-2004). Manual - part 612

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-145

STEP 3. Measure the power supply voltage at right bank 
heated oxygen sensor (front) harness side connector B-07.
(1) Disconnect the connector B-07 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 right bank heated oxygen 
sensor (front) connector B-07 (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 

P.00E-2

. Then go to Step 12. 

AK201274

1

2

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CONNECTOR: B-07

B-07(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AKX01498

B-07 HARNESS 
CONNECTOR: 
COMPONENT SIDE

1

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4

AY

AK200951

2 1

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B-22X

AB

CONNECTOR: B-22X

HARNESS 
CONNECTOR: 
COMPONENT SIDE

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-146

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. 25 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 

P.00E-2

. Then go to Step 12. 

AK200938

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AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

AK201397

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6 7 8 9

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20

21 22

232425

2627

10111213

14 15

16 1718

19

D-132 HARNESS 
CONNECTOR: 
HARNESS SIDE

AB

AK200938

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AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-147

STEP 7. Check for open circuit or short circuit to ground 
between right bank heated oxygen sensor (front) 
connector B-07 (terminal No. 3) and PCM connector D-132 
(terminal No. 25).
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.

AK201274

1

2

3

4

CONNECTOR: B-07

B-07(B)

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK200938

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25

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27

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13

AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-148

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 

P.00E-2

. Then go to Step 12. 

AK200938

2

3

4

5

6

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9

1

10

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21

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25

26

27

11

12

13

AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)