Mitsubishi Montero Sport (2004+). Manual — part 227

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-321

STEP 3. Measure the power supply voltage at left bank
heated oxygen sensor (front) harness side connector A-09.
(1) Disconnect the connector A-09 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 connector C-59 at the MFI relay for damage.
Q: Is the connector in good condition?

YES : Check connector C-14 at intermediate connector for

damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection

P.00E-2

. If intermediate connector is in good

condition, repair harness wire between MFI relay
connector C-59 (terminal No. 1) and left bank heated
oxygen sensor (front) connector A-09 (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.

AK200496

1

2

3

4

A-09(GR)

AB

CONNECTOR: A-09

HARNESS
CONNECTOR:
COMPONENT SIDE

LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)

AKX01496

2

1

4

3

A-09 HARNESS
CONNECTOR:
COMPONENT SIDE

AP

AK200023

2 1

3

4

CONNECTOR: C-59

AB

C-59

HARNESS
CONNECTOR:
COMPONENT
SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-322

STEP 5. Measure the power supply voltage at PCM
connector C-89 by backprobing.
(1) Do not disconnect the connector C-89.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 3 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 connector C-89 at PCM for damage.
Q: Is the 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.

AK103914

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30

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35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01540

AKX01540

1

2

3 4

5 6

7 8

10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

C-89 HARNESS
CONNECTOR:
HARNESS SIDE

AH

9

AK103914

2

3

4

5

6

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9

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14

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30

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35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-323

STEP 7. Check for open circuit or short circuit to ground
between left bank heated oxygen sensor (front) connector
A-09 (terminal No. 3) and PCM connector C-89 (terminal
No. 3).
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.

AK200496

1

2

3

4

A-09(GR)

AB

CONNECTOR: A-09

HARNESS
CONNECTOR:
COMPONENT SIDE

LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

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31

32

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34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-324

STEP 8. Check connector C-89 at PCM for damage.
Q: Is the 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.

STEP 9. Check for harness damage between MFI relay
connector C-59 (terminal No. 1) and left bank heated
oxygen sensor (front) connector A-09 (terminal No. 1).

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

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22

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24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200023

2 1

3

4

CONNECTOR: C-59

AB

C-59

HARNESS
CONNECTOR:
COMPONENT
SIDE

AK200496

1

2

3

4

A-09(GR)

AB

CONNECTOR: A-09

HARNESS
CONNECTOR:
COMPONENT SIDE

LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)