Mitsubishi Eclipse. Manual - part 576

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-847

STEP 3. Check the intake manifold tuning solenoid.
(1) Disconnect the intake manifold tuning solenoid connector 

B-49.

(2) Measure the resistance between intake manifold tuning 

solenoid side connector terminal No. 1 and No. 2.

Standard value: 29 

− 35 ohms [at 20°C (68°F)]

Q: Is the resistance between 29 and 35 ohms?

YES : Go to Step 4.
NO :  Replace the intake manifold tuning solenoid. Then go 

to Step 12.

STEP 4. Check the power supply voltage at intake manifold 
tuning solenoid harness side connector B-49.
(1) Disconnect the connector B-49 and measure at the harness 

side.

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

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

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK102948

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

AK103038

1

2

B-49 HARNESS
CONNECTOR:
COMPONENT SIDE 

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-848

STEP 5. 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 intake manifold tuning 
solenoid connector B-49 (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.

STEP 6. Check the power supply voltage at ECM connector 
C-51 <M/T> or PCM connector C-55 <A/T> by backprobing.
(1) Do not disconnect the connector C-51 <M/T> or C-55 

<A/T>.

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

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

AK300462

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

CONNECTOR: C-55 <A/T>

C-55 (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-849

(3) Measure the voltage between terminal No. 32 <M/T> or No. 

53 <A/T> and ground by backprobing.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 9.
NO :  Go to Step 7.

AK103039

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 HARNESS CONNECTOR:
HARNESS SIDE 

AC

9

<M/T>

AK103040

41

AC

<A/T>

C-55 HARNESS CONNECTOR:
HARNESS SIDE 

42 43

44 45 46

47 48 49 50 51 52 53 54 55 56 57

58 59

60 61 62

64 65 66

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-850

STEP 7. Check connector C-51 at ECM <M/T> or connector 
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK300462

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

CONNECTOR: C-55 <A/T>

C-55 (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