Mitsubishi Lancer Evolution IX. Manual - part 454

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-291

Inspection Procedure 19: Battery Rundown

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed alternator, 

failed generation control circuit or other faults.

PROBABLE CAUSES

• Failed battery

• Alternator G terminal short-circuit

• Failed alternator

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Measure battery voltage during cranking.

OK: 8 V or more

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check battery (Refer to GROUP 54A 

− 

Battery 

− On-vehicle Service − Battery test 

P.54A-5

).

STEP 2. Connector check: B-14 intermediate 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform voltage measurement at B-14 
intermediate connector.

• Disconnect connector, and measure at male con-

nector side.

• Ignition switch: "ON"

• Voltage between terminal No. 9 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Go to Step 4 .

AK305035

3

4

5

8

9

1

2

6

7

10

Connector : B-14

Female side 
connector

B-14(B)

AC

AK401753

1

2 3

6

7 8

4 5

9 10

Connector : B-14

Male side 
connector

B-14(B)

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-292

STEP 4. Connector check: C-208 ignition switch 
connector

Q: Is the check result normal?

YES : 

Check intermediate connectors C-01, C-23 

<L.H. drive vehicles>, C-124, C-211 and 
C-214, and repair if necessary. If 
intermediate connectors are normal, check 
and repair harness between B-14 (terminal 
No. 9) intermediate connector and C-208 
(terminal No. 2) ignition switch connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

STEP 5. Perform voltage measurement at B-14 
intermediate connector.

• Disconnect connector, and measure at female 

connector side.

• Ignition switch: "ON"

• Voltage between terminal No. 10 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Go to Step 6 .

STEP 6. Connector check: B-25 alternator 
connector

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair or replace the connector.

AK305251

1

2

3

4

5

6

Harness side connector

Connector: C-208

C-208

<L. H. drive vehicles>

<R. H. drive vehicles>

C-208

AB

AK401753

1

2 3

6

7 8

4 5

9 10

Connector : B-14

Male side 
connector

B-14(B)

AB

AK305035

3

4

5

8

9

1

2

6

7

10

Connector : B-14

Female side 
connector

B-14(B)

AC

AK305036

M

2

1

3

4

Harness side 
connector

AB

Connector : B-25

B-25(GR)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-293

STEP 7. Check harness between B-14 (terminal 
No. 10) intermediate connector and B-25 
(terminal No. 1) alternator connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the damaged harness wire.

STEP 8. Check harness between B-14 (terminal 
No. 9) intermediate connector and B-25 (terminal 
No. 3) alternator connector.

• Check power supply line for open/short circuit.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

AK305035

3

4

5

8

9

1

2

6

7

10

Connector : B-14

Female side 
connector

B-14(B)

AC

AK305036

M

2

1

3

4

Harness side 
connector

AB

Connector : B-25

B-25(GR)

AK305035

3

4

5

8

9

1

2

6

7

10

Connector : B-14

Female side 
connector

B-14(B)

AC

AK305036

M

2

1

3

4

Harness side 
connector

AB

Connector : B-25

B-25(GR)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-294

STEP 9. Check harness between B-25 (terminal 
No. 3) alternator connector and C-208 (terminal 
No. 2) ignition switch connector.

NOTE: Before checking harness, check intermediate 
connectors C-01, C-23 <L.H. drive vehicles>, C-124, 
C-211 and C-214, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Replace the alternator.

NO : 

Repair the damaged harness wire.

STEP 10. Connector check: C-121 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace the connector.

AK305036

M

2

1

3

4

Harness side 
connector

AB

Connector : B-25

B-25(GR)

AK305251

1

2

3

4

5

6

Harness side connector

Connector: C-208

C-208

<L. H. drive vehicles>

<R. H. drive vehicles>

C-208

AB

AK501995

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

AB

Connector: C-121

C-121 (GR)

C-121 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>