Mitsubishi Eclipse. Manual - part 343

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-865

STEP 14. Check the power supply voltage at ECM 
connector C-49 <M/T> or PCM connector C-50 <A/T>.
(1) Disconnect the connector C-49 <M/T> or C-50 <A/T> and 

measure at the harness side.

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

AK300413

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

CONNECTOR: C-49 <M/T>

C-49 (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-866

(3) Measure the voltage between terminal No. 22 <M/T> or No. 

21 <A/T> and ground.

• Voltage should be battery positive voltage.

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

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

malfunction symptom is eliminated.

NO :  Check harness connector C-28 and C-108 at 

intermediate connector for damage, and repair or 
replace as required. Refer to, GROUP 00E, Harness 
Connector Inspection 

P.00E-2

. If intermediate 

connectors are in good condition, repair harness wire 
between fuel pump relay 2 connector C-105 (terminal 
No. 2) and ECM connector C-49 (terminal No. 22) 
<M/T> or PCM connector C-50 (terminal No. 21) 
<A/T> because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

AK000408AJ

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

<M/T>

C-49 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK000409

AK000409 AS

1

2

3

4

5

6

7

8

9

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

<A/T>

C-50 HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-867

INSPECTION PROCEDURE 31: Ignition Switch-ST System. <M/T>

AK101528

4 5 6

1 2 3

BL

ACK

-

RED

BL

ACK

-

RED

BL

ACK

-

RED

8

7

2

6

3

5

1

BL

ACK

-RED

4

BL

ACK

GREEN-

BL

ACK

GREEN-

BL

ACK

BL

ACK

-

RED

LOCK

ACC

C-87

Ignition Switch-ST Circuit

R

IGNITION
SWITCH

IG2

IG1

ST

16

5

5

2

3

1

STARTER
RELAY

71

2

2

INTERLOCK
SWITCH

C-02

1

OFF

ON

ENGINE
CONTROL
MODULE (ECM)

C-07

C-28

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

C-60

(MU803772)

82

78

81

80

89 90 91 92

79

87

71

74

73

72

76

75

77

85

88

83 84

86

1 2

A-13X

3

4
5

1 2

BL

ACK

-RED

TO STARTING
SYSTEM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-868

.

CIRCUIT OPERATION

• The battery positive voltage is supplied to the 

ECM (terminal No. 71) via the starter relay during 
engine cranking. With this, the ECM detects that 
the engine is being cranked.

.

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

• Malfunction of the ignition switch.

• Malfunction of the starter relay.

• Improper connector contact, open circuit or 

short-circuited harness wire.

• Malfunction of the ECM.

AK300122

STARTER RELAY

CONNECTOR: A-13X

AB

A-13X

AK300119

CONNECTOR: C-28

AB

C-28

AK300060

ECM

CONNECTOR: C-60 <M/T>

AE

C-60 (G)

AK300092

CONNECTOR: C-07

AB

C-07

AK300116

CONNECTOR: C-87

AB

C-87

AK300743

CONNECTOR: C-02

AB

C-02