Mitsubishi Eclipse. Manual - part 348

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-885

STEP 9. Check connector A-12X at engine speed detection 
and connector C-56 at ECM <M/T> or connector C-54 at 
PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK300747

1

CONNECTOR: A-12X

AB

A-12X

HARNESS CONNECTOR:
COMPONENT 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

AK300412

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

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-886

STEP 10. Check for open circuit and short circuit to 
ground and harness damage between engine speed 
detection connector A-12X and ECM connector C-56 
(terminal No. 58) <M/T> or PCM connector C-54 (terminal 
No. 43) <A/T>
Q: Is the harness wire in good condition?

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

malfunction symptom is eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK300747

1

CONNECTOR: A-12X

AB

A-12X

HARNESS CONNECTOR:
COMPONENT 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

AK300412

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

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-887

INSPECTION PROCEDURE 34: A/C system.

.

COMMENT

• When the A/C is "ON", the battery positive volt-

age is applied on the ECM (terminals No. 45) 
<M/T> PCM (terminals No. 83) <A/T> from the 
automatic compressor controller. 
When battery positive voltage is applied to the 
ECM <M/T> or PCM <A/T>, the ECM <M/T> or 
PCM <A/T> turns "ON" the power transistor in the 
ECM <M/T> or PCM <A/T>. The ECM <M/T> or 
PCM <A/T> delays A/C engagement momentarily 
while it increases idle rpm. Then the A/C com-
pressor clutch relay coil will be energized. 

With this, the A/C compressor clutch relay turns 
"ON", and the A/C compressor clutch functions.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case: )

• Malfunction of the A/C control system.

• Malfunction of the A/C switch.

• Improper connector contact, open circuit or 

short-circuited harness wire.

• Malfunction of the ECM <M/T> or PCM <A/T>.

AK000684

GREEN-

RED

GREEN

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

45 <M/T>*2
83 <A/T>*4

8 <M/T>*1
20 <A/T>*3

C-49 <M/T>
(MU803773)

C-53 <M/T>
(MU803771)

C-50 <A/T>
(MU803784)

C-57 <A/T>
(MU803782)

A/C COMPRESSOR
RELAY

NOTE
*1:ECM connector C-49 <M/T>
*2:ECM connector C-53 <M/T>
*3:PCM connector C-50 <A/T>
*4:PCM connector C-57 <A/T>

AUTOMATIC
COMPRESSOR
CONTROLLER

6

17

8

15

9

18

7

20

16

2

10

13

12

23 24 25 26

11

21

3

1

14

4

19

5

22

12

11

16

5 6

7 8

21

13
27

14
28

15
29

17
30

18
31

19
32

20
33

22
34

23
35

1

24

3

26

9

2

25

10

4

34

33

32

36

35

37

42

45

31

39

38

46

40 41

43 44

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

A/C Circuit

AK300060

ECM

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

AK

C-53 (G)

C-49 (G)

AK300060

PCM

CONNECTORS: C-50, C-57 <A/T>

AL

C-57 (GR)

C-50 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-888

DIAGNOSIS

STEP 1. Check connector C-49, C-53 at ECM <M/T> or 
connector C-50, C-57 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

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

AK300420

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

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

CONNECTORS: C-50, C-57 <A/T>

C-57 (GR)

C-50 (GR)

AB

C-57 HARNESS CONNECTOR:
COMPONENT SIDE

C-50 HARNESS CONNECTOR:
COMPONENT SIDE