Mitsubishi Eclipse. Manual - part 339

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-849

STEP 8. Measure the power supply voltage at ECM harness 
side connector C-53 <M/T> or PCM harness side connector 
C-54 <A/T>.
(1) Disconnect the connector C-53 <M/T> or C-54 <A/T> and 

measure at the harness side.

AK300417

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

CONNECTOR: C-53 <M/T>

C-53 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300412

42

43

48

49

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51

52

53

54

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57

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47

41

C-54 (GR)

CONNECTOR: C-54 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-850

(2) Measure the voltage between terminal No. 38 <M/T> or No. 

49 <A/T> and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 9.
NO :  Repair harness wire between MFI relay connector 

A-18X (terminal No. 3) and ECM connector C-53 
(terminal No. 38) <M/T> or PCM connector C-54 
(terminal No. 49) <A/T> because of open circuit. Then 
confirm that the malfunction symptom is eliminated.

AK000405

<M/T>

C-53 HARNESS
CONNECTOR:
COMPONENT SIDE

AI

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AK000406AL

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<A/T>

C-54 HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-851

STEP 9. Measure the power supply voltage at ECM harness 
side connector C-49, C-53 <M/T> or PCM harness side 
connector C-54 <A/T>.
(1) Disconnect the connector C-49, C-53 <M/T> or C-54 <A/T> 

and measure at the harness side.

AK300419

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

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

CONNECTORS: C-49, C-53 <M/T>

C-53 (G)

C-49 (G)

AB

C-53 HARNESS CONNECTOR:
COMPONENT SIDE

C-49 HARNESS CONNECTOR:
COMPONENT SIDE

AK300412

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

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59

60

61

62

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64

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66

47

41

C-54 (GR)

CONNECTOR: C-54 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-852

(2) Using a jumper wire, connect terminal No. 38 <M/T> or No. 

49 <A/T> to ground.

(3) Measure the voltage between terminal (No. 12, No. 25) 

<M/T> or (No. 41, No. 47) <A/T> and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Replace the ECM or PCM. Then confirm that the 

malfunction symptom is eliminated.

NO :  Repair harness wire between MFI relay connector 

A-18X (terminal No. 4) and ECM connector C-49 
(terminal No. 12, No. 25) <M/T> or PCM connector 
C-54 (terminal No. 41, No. 47) <A/T> because of 
open circuit. Then confirm that the malfunction 
symptom is eliminated.

AK000407

1

2

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38

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46

<M/T>

HARNESS CONNECTOR:
COMPONENT SIDE

C-49

C-53 

AH

AKX01438

<A/T>

C-54 HARNESS 
CONNECTOR: 
COMPONENT SIDE

41

42

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49

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AR