Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 179

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-415

STEP 8. Check 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.

(2) Measure the voltage between terminal 38 <M/T> or 49 <A/

T> and ground.

•

Voltage should be battery positive voltage.

Q: Is the voltage normal?

YES : Go to Step 9.
NO : Repair harness wire between MFI relay connector A-

21X terminal 2 and ECM connector C-53 terminal 38
<M/T> or PCM connector C-54 terminal 49 <A/T>
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 9. Check 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.

(2) Using a jumper wire, connect terminal 38 <M/T> or 49 <A/

T> to ground.

(3) Measure the voltage between terminal (12, 25) <M/T> or

(41, 47) <A/T> and ground.

•

Voltage should be battery positive voltage.

Q: Is the voltage normal?

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

malfunction symptom is eliminated.

NO : Repair harness wire between MFI relay connector A-

21X terminal 1 and ECM connector C-49 terminal (12,
25) <M/T> or PCM connector C-54 terminal (41, 47)
<A/T> because of open circuit. Then confirm that the
malfunction symptom is eliminated.

AK000405

<M/T>

C-53 HARNESS
SIDE CONNECTOR

AC

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

AK000406AD

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

<A/T>

C-54 HARNESS
SIDE CONNECTOR

AK000407

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

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

<M/T>

HARNESS SIDE
CONNECTOR

C-49

C-53

AC

AKX01438

C-54 HARNESS
SIDE CONNECTOR

<A/T>

46 45 44
57 56 55
66 65 64

54 53 52 51 50 49 48 47

43 42 41

63 62 61 60

59 58

AG

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-416

INSPECTION PROCEDURE 30: Fuel pump system.

AK000680

2

3 4

1 2 3

4

4

4 5 6

1 2

1
3

2

4 5

4

8

7

2

6

3

5

1

17

6

GREEN

3

BLA

CK-

WHITE

1

BLA

CK-

WHITE

BLA

CK-

WHITE

BLA

CK

WHITE

BLA

CK-

WHITE

1

12 13 14

18

30

41

34

3

16

10

6 7

19

31

42

20

32

43

21

33

25

24

26

36

35

37

29

28

15

27

38

8 9

39 40

11

2

22

5

23

5

BLA

CK

GREEN

GREEN

GREEN

BLA

CK

IG2

ST

LOCK

ACC

IG1

C-87

2

5

C-89

C-07
MU801333

29

JUNCTION
BLOCK

R

C-101
MU801331

IGNITION
SWITCH

3

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

FUEL PUMP AND
GAUGE UNIT

FUEL PUMP
RELAY

A-20X

3

4

1

2

22<M/T>
21<A/T>

6

C-90

C-28

D-17

(MU802058)

5

1

5

4

15 16

26 27 28 29

32 33 34

17 18 19 20 21 22 23 24 25

30 31

36 37

35

38

10

11 12 13

1 2 3

4 5 6 7 8 9

14

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

3132 33

34 35

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

1

3

10

C-49<M/T>
(MU803773)

C-50<A/T>
(MU803784)

10 11

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

M

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-417

AK000734AC

CONNECTOR:D-17

AK000315

CONNECTOR:C-101

AC

AK000360AB

CONNECTOR : A-20X

AK000345AE

CONNECTOR:C-89

AK000280

C-49,C-50

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49<M/T>,C-50<A/T>

BC

AK000312AJ

CONNECTOR:C-07

AK000219

CONNECTOR:C-87

AC

AK000733AC

CONNECTOR:C-28

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-418

CIRCUIT OPERATION

•

A battery positive voltage is applied on the fuel
pump relay (terminal 3, 4) from the ignition
switch-IG.

•

During cranking and while the engine is running,
the ECM <M/T> or PCM <A/T> turns the power
transistor in the ECM <M/T> or PCM <A/T> ON
to ground the fuel pump relay coil. With this, the
fuel pump relay turns ON, and the battery positive
voltage is supplied to the fuel pump from the fuel
pump relay (terminal 1).

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:）

））

）

•

Malfunction of the fuel pump relay.

•

Malfunction of the fuel pump.

•

Improper connector contact, open or short-
circuited harness wire.

•

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

DIAGNOSIS

Required Special Tool:
MB991502:Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check actuator test
item 07: Fuel Pump.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the actuator test mode for item

07, Fuel Pump.

•

An operation sound of the fuel pump should be heard.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the fuel pump operating properly?

YES : That this malfunction is intermittent. Refer to GROUP

00, How to Use Troubleshooting/Inspection Service
Points (

P.00-6

).

NO : Go to Step 2.

AK000345

CONNECTOR:C-90

AD

AKX01177

16 PIN

MB991502

AB