Mitsubishi Eclipse. Manual - part 207

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-321

STEP 5. Measure the power supply voltage at ECM 
connector C-56 <M/T> or PCM connector C-50 <A/T> by 
backprobing.
(1) Do not disconnect the connector C-56 <M/T> or C-50 

<A/T>.

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

AK300416

58

60

61

53 52 51

55 54

56

59

62

57

CONNECTOR: C-56 <M/T>

C-56 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

2

3

4

5

6

7

8

9

11

12

13

14

15

16

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18

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20

30

21

22

23

24

25

26

27

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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-322

(3) Measure the voltage between terminal No. 54 <M/T> or No. 

26 <A/T> 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.

AK000294

<M/T>

C-56 HARNESS 
CONNECTOR: 
HARNESS SIDE

5152 53 54 55 56

57 58 59 60 6162

AK000294AI

AK000295

1

2

3 4

5 6

7 8

9 10 111213 1415 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 313233

34 35

AJ

C-50 HARNESS 
CONNECTOR: 
HARNESS SIDE

<A/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-323

STEP 6. Check connector C-56 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 12.

AK300416

58

60

61

53 52 51

55 54

56

59

62

57

CONNECTOR: C-56 <M/T>

C-56 (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-324

STEP 7. Check for open circuit and short circuit to ground 
between heated oxygen sensor (rear) connector C-23 
(terminal No. 6) and ECM connector C-56 (terminal No. 54) 
<M/T> or PCM connector C-50 (terminal No. 26) <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

AK300405

2

1

6 5 4 3

AB

C-23

HEATED OXYGEN
SENSOR (REAR)

CONNECTOR: C-23

HARNESS 
CONNECTOR:
HARNESS SIDE

AK300416

58

60

61

53 52 51

55 54

56

59

62

57

CONNECTOR: C-56 <M/T>

C-56 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE