Mitsubishi Eclipse. Manual - part 332

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-821

INSPECTION PROCEDURE 26: Generator output voltage is low (approximately 12.3 volts)

AK000676

4

3

2

6

3 4
7 8

1 2

5

1

BL

ACK

-RED

BL

ACK

-RED

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

GENERATOR

VOLTAGE
REGULATOR

B-45

1

2

     B-13
MU802749

33 <M/T>
8 <A/T>

C-53 <M/T>
(MU803771)

C-50 <A/T>
(MU803784)

34

33

32

36

35

37

42

45

31

39

38

46

40 41

43 44

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

Generator Circuit

AK300067

CONNECTOR: B-13

AB

B-13 (B)

AK300064

CONNECTOR: B-45

AB

B-45 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-822

.

CIRCUIT OPERATION

• The EMC <M/T> or PCM <A/T> controls genera-

tor out put current by duty-controlling continuity 
between the generator G terminal (terminal No. 
1) and ground.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this charging system: )

• Malfunction of the charging system.

• Short circuit in the harness between generator G 

terminal and ECM <M/T> or PCM <A/T>.

• ECM <M/T> or PCM <A/T> failed.

DIAGNOSIS

STEP 1. Measure the voltage at generator intermediate 
connector B-13 by backprobing.
(1) Do not disconnect the connector B-13.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 2 and ground by 

backprobing.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

• Voltage rises by 0.2 − 3.5 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 0.2 and 3.5 volts?

YES : Replace the generator. Then confirm that the 

malfunction symptom is eliminated.

NO :  Go to Step 2.

AK300060

ECM

CONNECTOR: C-53 <M/T>

AH

C-53 (G)

AK300060AD

C-50 (GR)

PCM

CONNECTOR: C-50 <A/T>

AK300739

CONNECTOR: B-13

AB

B-13 (B)

3

4

7

8

1

2

5

6

HARNESS CONNECTOR:
COMPONENT SIDE

AK000365 AE

B-13 HARNESS 
CONNECTOR: 
HARNESS SIDE

1 2 3 4

5 6 7 8

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-823

STEP 2. Check connector B-13 at generator intermediate 
connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 3. Check connector B-45 at generator connector for 
damage.
Q: Is the connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK300739

CONNECTOR: B-13

AB

B-13 (B)

3

4

7

8

1

2

5

6

HARNESS CONNECTOR:
COMPONENT SIDE

AK300740

2

1

3

4

CONNECTOR: B-45

AB

B-45 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-824

STEP 4. Check connector C-53 at ECM <M/T> or connector 
C-50 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK300417

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

CONNECTOR: C-53 <M/T>

C-53 (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