Mitsubishi Lancer Evolution IX. Manual - part 452

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-283

STEP 14. Check throttle body (throttle valve 
portion) for contamination.

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-395

).

STEP 15. M.U.T.-II/III actuator test.

• Item No. 12: Waste gate solenoid valve

OK: Operating sound is audible on actua-
tion.

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Check waste gate solenoid valve system 
(Refer to Code No. P0243 

P.13A-130

).

STEP 16. Check turbo charger supercharging 
pressure.

• Check turbo charger output pressure (Refer to 

GROUP 15 

−Intake Exhaust −On-vehicle Service 

P.15-2

).

Q: Is the check result normal?

YES : 

Go to Step 17 .

NO : 

Repair.

STEP 17. Check supercharging pressure control 
system.

• Check supercharging pressure control system 

(Refer to GROUP 15 

−Intake Exhaust 

−On-vehicle Service 

P.15-3

).

Q: Is the check result normal?

YES : 

Go to Step 18 .

NO : 

Repair.

STEP 18. M.U.T.-II/III actuator test.

• Item No. 09: Fuel pressure control solenoid valve

OK: Operating sound is audible on actua-
tion.

Q: Is the check result normal?

YES : 

Go to Step 19 .

NO : 

Check fuel pressure control solenoid valve 
system (Refer to Code No. P0443 

P.13A-182

).

STEP 19.Fuel pressure measurement.

• Fuel pressure measurement (Refer to 

P.13A-396

).

Q: Is the check result normal?

YES : 

Go to Step 20 .

NO : 

Repair.

STEP 20. Check compression pressure.

• Check compression pressure (Refer to GROUP 

11A 

− On-vehicle Service 

P.11A-11

).

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Repair.

Inspection Procedure 13: The Feeling of Impact or Vibration when Accelerating

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed ignition leak 

with rise in spark plug-required voltage at accel-
eration.

PROBABLE CAUSES

• Failed ignition system

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-17

).

NO : 

Go to Step 2 .

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-284

STEP 2. Connector check: B-103 and B-114 
ignition coil connectors

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check ignition coil spark.

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Go to Step 4 .

STEP 4. Check spark plug.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Replace the spark plug.

STEP 5. Check spark plug cable itself.

• Check spark plug cable itself (Refer to GROUP 

16 

− Ignition System − On-vehicle Service 

P.16-29

).

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace the spark plug cable.

STEP 6. Check ignition coil itself.

• Check ignition coil itself (Refer to GROUP 16 − 

Ignition System 

− On-vehicle Service 

P.16-28

).

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Replace the ignition coil.

STEP 7. Check harness between ignition coil 
connector terminal No. 2 of each cylinder and 
body earth.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Check and repair harness between ignition 

coil connector terminal No. 3 of each 
cylinder and C-121 engine-ECU connector.

• Check signal line for open/short 

circuit and damage.

NO : 

Repair the damaged harness wire.

AK305047

1

2

3

Connector : B-103, B-114

B-114(GR)

B-103(GR)

AB

Harness side 
connector

AK305047

1

2

3

Connector : B-103, B-114

B-114(GR)

B-103(GR)

AB

Harness side 
connector

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>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-285

Inspection Procedure 14: The Feeling of Impact or Vibration when Decelerating

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by insufficient air 

intake due to failed idle speed control system.

PROBABLE CAUSES

• Failed idle speed system

• Throttle valve body fouled

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-17

).

NO : 

Go to Step 2 .

STEP 2. Check idle speed control servo for 
operating sound.

• Check idle speed control servo for operating 

sound (Refer to 

P.13A-408

).

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Check idle speed control servo system 
(Refer to Code No. P0505 

P.13A-190

).

STEP 3. M.U.T.-II/III data list

• Refer to Data List Reference Table 

P.13A-372

.

a. Item No. 14: Throttle position sensor

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Check throttle position sensor system 
(Refer to Code No. P0120 

P.13A-60

).

STEP 4. Check throttle body (throttle valve 
portion) contamination.

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-395

).

Inspection Procedure 15: Knocking

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed detonation 

control, improper thermal value of spark plug or 
other faults.

PROBABLE CAUSES

• Defective detonation sensor

• Failed detonation control system

• Failed ignition system

• Defective spark plug

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III diagnosis code

Q: Diagnosis code set?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-17

).

NO : 

Go to Step 2 .

STEP 2. Connector check: B-103 and B-114 
ignition coil connectors

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair the damaged harness wire.

AK305047

1

2

3

Connector : B-103, B-114

B-114(GR)

B-103(GR)

AB

Harness side 
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-286

STEP 3. Check ignition coil spark.

Q: Is the check result normal? 

YES : 

Check detonation sensor (Refer to Code 

No. P0325 

P.13A-151

).

NO : 

Go to Step 4 .

STEP 4. Check spark plug.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Replace the spark plug.

STEP 5. Check spark plug cable itself.

• Check spark plug cable itself (Refer to GROUP 

16 

−Ignition System − On-vehicle Service 

P.16-29

).

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace the spark plug cable.

STEP 6. Check ignition coil itself.

• Check ignition coil itself (Refer to GROUP 16 − 

Ignition System 

− On-vehicle Service 

P.16-28

).

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Replace the ignition coil.

STEP 7. Check harness between ignition coil 
connector terminal No. 2 of each cylinder and 
body earth.

• Check earthing line for open circuit or damage.

Q: Is the check result normal? 

YES : 

Check and repair harness between ignition 

coil connector terminal No. 3 of each 
cylinder and C-121 engine-ECU connector.

• Check signal line for open/short 

circuit and damage.

NO : 

Repair the damaged harness wire.

AK305047

1

2

3

Connector : B-103, B-114

B-114(GR)

B-103(GR)

AB

Harness side 
connector

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>