Mitsubishi Eclipse. Manual - part 593

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-915

NOTE: Check harness after checking intermediate connectors 
C-77 and C-28. If intermediate connectors are damaged, repair 
or replace them. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. Then check that the malfunction is elimi-

nated.
Q: Is the harness wire in good condition?

YES :  Refer to, INSPECTION PROCEDURE 29 

− Power 

Supply System and Ignition Switch 

− IG System 

P.13B-1014

.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-916

INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVIVE ENGINE SOON or Check 
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.

AK301716

3

2

4 5 6

1 2 3
4 5 6

GREEN

1

RED-

YELLO

W

RED-

YELLO

W

BLA

CK-

WHITE

R

IG2

LOCK

ACC

IG1

    C-111
MU801331

IGNITION
SWITCH

C-87

2

6

25

JUNCTION
BLOCK

52

41

MALFUNCTION INDICATOR LAMP
(SERVICE ENGINE SOON OR CHECK ENGINE LAMP)

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

21

22

ST

44 45

41

46 47

42 43

49 50 5152

48

55 56

54

53

C-41

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-51 <M/T>, C-52 <A/T>
         (MU803784)

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

10

Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit

1

6

4 5

11

10

1213

15

17

16

14

19

18

8 9

7

20

2 3

2122 23 2425 26 27 28

C-108

7.5A

23

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-917

.

CIRCUIT OPERATION

• The malfunction indicator lamp (SERVICE 

ENGINE SOON or Check Engine Lamp) power is 
supplied from the ignition switch.

• The ECM <M/T> or PCM <A/T> controls the 

ground of the malfunction indicator lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) by 
turning the power transistor in the ECM <M/T> or 
PCM <A/T> ON and OFF.

.

COMMENT

• The ECM <M/T> or PCM <A/T> causes the mal-

function indicator lamp (SERVICE ENGINE 
SOON or Check Engine Lamp) to illuminate for 5 
seconds immediately after the ignition switch is 
turned to the "ON" position occurred.

.

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

• Burnt-out bulb.

AK300072

CONNECTOR: C-41

AB

C-41 (B)

AK300124

CONNECTOR: C-111

AB

C-111

AK300123

CONNECTOR: C-108

AB

C-108

AK300116

CONNECTOR: C-87

AB

C-87

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300119

CONNECTOR: C-28

AB

C-28

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-918

• Defective malfunction indicator lamp (SERVICE 

ENGINE SOON or Check Engine Lamp) circuit.

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

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 16: 
Power Supply Voltage.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before. con-
necting or disconnecting scan tool MB991958.
(1)  Connect scan tool MB991958 to the data link connector.
(2)  Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item 

16, Power Supply Voltage.

• 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 2.
NO :  Refer to INSPECTION PROCEDURE 29 

− Power 

Supply System and Ignition Switch 

− IG System 

P.13B-1014

.

STEP 2. Check the burned-out bulb.
Q: Is the valve normal?

YES :  Go to step 3.
NO :   Replace the bulb. Then confirm that the malfunction 

symptom is eliminated.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824