Mitsubishi Eclipse. Manual - part 136

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-37

STEP 4. Check for short circuit to ground between volume 
airflow sensor connector B-14 (terminal No. 7) and ECM 
connector C-49 (terminal No. 19) <M/T> or PCM connector 
C-50 (terminal No. 19) <A/T>.
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.

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-38

STEP 5. Measure the reset signal voltage at volume airflow 
sensor connector B-14 by backprobing.
(1) Do not disconnect the connector B-14.
(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 be 1.0 volt or 

less.

• When the engine speed is 3,000 r/min, 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 8.
NO :  Go to Step 6.

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AKX01515 AG

B-14 HARNESS
CONNECTOR:
HARNESS SIDE

1 2 3 4 5 6 7

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-39

STEP 6. Check connector B-14 at volume airflow sensor 
and connector C-49 at ECM <M/T> or connector C-50 at 
PCM <A/T> 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.

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-40

STEP 7. Check for open circuit and harness damage 
between volume airflow sensor connector B-14 (terminal 
No. 7) and ECM connector C-49 (terminal No. 19) <M/T> or 
PCM connector C-50 (terminal No. 19) <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 9.
NO :  Repair it. Then go to Step 9.

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE