Mitsubishi Montero Sport (2004+). Manual — part 156

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-37

STEP 1. Using scan tool MB991958, check data list item 12:
Volume Airflow Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item

12, Volume Airflow Sensor.

(4) Warm up the engine to normal operating temperature: 80

°C

to 95

°C (176°F to 203°F).

• The standard value during idling should be 10 Hz or

more.

• When the engine is revved, the frequency should

increase according to the increase in engine speed.

(5) 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

P.00-7

.

NO : Go to Step 2.

STEP 2. Measure the reset signal voltage at volume airflow
sensor connector A-01 by backprobing.
(1) Do not disconnect the connector A-01.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 7 and ground by

backprobing.

• Voltage should be between 6.0 and 9.0 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 6.0 and 9.0 volts?

YES : Go to Step 5.
NO : Go to Step 3.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01515 AI

A-01 HARNESS
CONNECTOR:
HARNESS SIDE

1 2 3 4 5 6 7

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 3. Check connector A-01 at volume airflow sensor
and connector C-89 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 9.

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-39

STEP 4. Check for short circuit to ground between volume
airflow sensor connector A-01 (terminal No. 7) and PCM
connector C-89 (terminal No. 19).
Q: Is the harness wire in good condition?

YES : Replace the volume airflow sensor. Then go to Step

9.

NO : Repair it. Then go to Step 9.

STEP 5. Measure the reset signal voltage at volume airflow
sensor connector A-01 by backprobing.
(1) Do not disconnect the connector A-01.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 7 and ground by

backprobing.

• When the engine idling, voltage should measure 1.0 volt

or less.

• When the engine speed is 3000 r/min, voltage should

measure between 6.0 and 9.0 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 8.
NO : Go to Step 6.

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01515 AI

A-01 HARNESS
CONNECTOR:
HARNESS SIDE

1 2 3 4 5 6 7

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 6. Check connector A-01 at volume airflow sensor
and 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 9.

AK103913

3

4

5

1

2

6

7

CONNECTOR: A-01

A-01(B)

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE