Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 325

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-499

STEP 7. Check the power supply voltage at fuel pump relay
connector A-20X.
(1) Disconnect the connector A-20X and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3, 4 and ground.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Go to Step 8.
NO : Check harness connectors C-07, C-89 and C-101 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 ignition switch connector C-87 terminal 2
and fuel pump relay connector A-20X terminal 3, 4
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 8. Check for open circuit and short circuit to ground
and harness damage between fuel pump relay connector
A-20X terminal 1 and fuel pump connector D-17 terminal 5.
NOTE: Check harness after checking intermediate connectors
C-28 and C-90. If intermediate connectors are damaged, repair
or replace them. After to GROUP 00E, Harness Connector
Inspection (

P.00E-2

). Then check that the malfunction is

eliminated.

Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AKX01441

A-20X HARNESS
SIDE CONNECTOR

1

2

3

4

AC

AK000360AB

CONNECTOR : A-20X

AK000734AC

CONNECTOR:D-17

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-500

STEP 9. Check connector C-51 at ECM <M/T> or connector
C-52 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.

STEP 10. Check the power supply voltage at ECM
connector C-51 <M/T> or PCM connector C-52 <A/T>.
(1) Disconnect the connector C-51 <M/T> or C-52 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 21 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 : Repair harness wire between fuel pump relay

connector A-20X terminal 2 and ECM connector C-51
terminal 21 <M/T> or PCM connector C-52 terminal
21 <A/T> because of open circuit. Then confirm that
the malfunction symptom is eliminated.

AK000225

CONNECTOR : C-51<M/T>, C-52<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

AJ

AK000448AC

8 7

6 5

4 3

2

1
9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

30

31

32

33

34

35

29

C-51<M/T>,C-52<A/T>
HARNESS SIDE
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-501

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

AK000718

3

4

5

4 5 6

1 2 3

1

BL

ACK

-

RED

BL

ACK

-

RED

BL

ACK

-

RED

BL

ACK

-

RED

2

8

7

2

6

3

5

1

BL

ACK

-RED

4

BL

ACK

GREEN-

BL

ACK

GREEN-

BL

ACK

A-18X

4

2

3

1

STARTER
RELAY

LOCK

ACC

C-87

R

IGNITION
SWITCH

IG2

IG1

ST

5

C-58
(MU803782)

68

16

4

2

INTERLOCK
SWITCH

C-02

1

OFF

ON

ENGINE
CONTROL
MODULE(ECM)

C-07
MU801333

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

65

43
50

42
49

41

48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

1 2

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-502

CIRCUIT OPERATION

•

The battery positive voltage is supplied to the
ECM (terminal 68) 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.

AK000356

CONNECTOR : A-18X

AB

AK000733AC

CONNECTOR:C-28

AK000357

CONNECTOR:C-58

AD

AK000312AJ

CONNECTOR:C-07

AK000219

CONNECTOR:C-87

AC

AK000312AF

CONNECTOR : C-02