Mitsubishi Eclipse. Manual - part 562

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-791

STEP 5. Check the power supply voltage at idle air control 
motor harness side connector B-34.
(1) Disconnect the connector B-34 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2, No. 5 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 7.
NO :  Go to Step 6.

STEP 6. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector 

A-18X (terminal No. 4) and idle air control motor 
connector B-34 (terminal No. 2, No. 5) because of 
open circuit or short circuit to ground. Then go to Step 
14.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 14.

AK300438

1

2

3

4

5

6

CONNECTOR: B-34

AB

B-34 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01428

3 2 1

B-34 HARNESS 
CONNECTOR: 
HARNESS SIDE

AO

6 5 4

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-792

STEP 7. Check the power supply voltage at ECM connector 
C-51 <M/T> or PCM connector C-52 <A/T> by backprobing.
(1) Do not disconnect the connector C-51 <M/T> or C-52 

<A/T>.

(2) Measure the voltage between terminal No. 14, No. 15, No. 

28, No. 29 and ground by backprobing.

• The voltage is 1 volt or lower for approximately 3 sec-

onds, then changes to the battery positive voltage when 
the Ignition switch is turned from the "LOCK" (OFF) 
position to the "ON" position.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 10.
NO :  Go to Step 8.

AK300458

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

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

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

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01550

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-51<M/T>, C-52<A/T>
HARNESS CONNECTOR:
HARNESS
SIDE 

AG

9

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-793

STEP 8. Check connector C-51 at ECM <M/T> or connector 
C-52 at PCM <A/T> 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 14.

AK300458

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

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

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

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-794

STEP 9. Check for open circuit and short circuit to ground 
between idle air control motor connector B-34 and ECM 
connector C-51 <M/T> or PCM connector C-52 <A/T>.

a. Idle air control motor connector B-34 terminal 1 and ECM 

connector C-51 (terminal No. 14) <M/T> or PCM connector 
C-52 (terminal No. 14) <A/T>.

b. Idle air control motor connector B-34 (terminal No. 3) and 

ECM connector C-51 (terminal No. 28) <M/T> or PCM con-
nector C-52 (terminal No. 28) <A/T>.

c. Idle air control motor connector B-34 (terminal No. 4) and 

ECM connector C-51 (terminal No. 15) <M/T> or PCM con-
nector C-52 (terminal No. 15) <A/T>.

d. Idle air control motor connector B-34 terminal 6 and ECM 

connector C-51 (terminal No. 29) <M/T> or PCM connector 
C-52 (terminal No. 29) <A/T>.

Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

AK300438

1

2

3

4

5

6

CONNECTOR: B-34

AB

B-34 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

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

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300458

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

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE