Mitsubishi Lancer Evolution IX. Manual - part 451

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-279

Inspection Procedure 11: Engine does not Revole Up

COMMENTS ON TROUBLE SYMPTOM

• Failure is possibly caused by failed fuel system, 

ignition system or other faults.

PROBABLE CAUSES

• Failed ignition system

• Failed fuel system

• Timing belt out of place

• 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 timing marks of timing belt.

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Align match marks.

STEP 3. Connector check: B-103 and B-114 
ignition coil connectors

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace the connector.

STEP 4. Check ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 5 .

STEP 5. Check spark plug.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace the spark plug.

STEP 6. 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 7 .

NO : 

Replace the spark plug cable.

STEP 7. 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 8 .

NO : 

Replace the ignition coil.

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-280

STEP 8. 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.

STEP 9. Fuel pressure measurement.

• Fuel pressure measurement (Refer to 

P.13A-396

).

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Repair.

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-281

Inspection Procedure 12: Hesitation, Sag,Poor Acceleration, Stumble or Surge

COMMENTS ON TROUBLE SYMPTOM

• Failure is possibly caused by failed ignition sys-

tem, improper air-fuel ratio, improper compres-
sion pressure or other faults.

PROBABLE CAUSES

• Failed air-fuel ratio control system

• Failed ignition system

• Failed fuel system

• Failed intake and exhaust system

• Failed emission control system

• Failed turbocharger system

• Throttle valve fouled

• Improper compression pressure

• 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 injector for operating sound.

• Check injector for operating sound (Refer to 

P.13A-406

).

Q: Can operating sound be heard?

YES : 

Go to Step 3 .

NO : 

Check the injector system of the defective 

cylinder.

(Refer to code No. P0201: No. 1 injector system 

P.13A-105

).

(Refer to code No. P0202: No. 2 injector system 

P.13A-111

).

(Refer to code No. P0203: No. 3 injector system 

P.13A-117

).

(Refer to code No. P0204: No. 4 injector system 

P.13A-123

).

STEP 3. M.U.T.-II/III data list

• Refer to Data List Reference Table 

P.13A-372

.

a. Item No. 13: Intake air temperature sensor
b. Item No. 14: Throttle position sensor

c. Item No. 21: Engine coolant temperature sen-

sor

d. Item No. 25: Barometric pressure sensor

Q: Are the check results normal?

YES : 

Go to Step 4 .

NO : 

Perform the diagnosis code classified check 
procedure for the sensor that has shown an 
abnormal data value (Refer to Inspection 
Chart for Diagnosis Codes 

P.13A-17

).

STEP 4. Check Purge control solenoid valve 
itself.

• Check Purge control solenoid valve itself (Refer 

to GROUP 17 

− Emission Control System − 

Evaporative Emission Control System 

P.17-11

).

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Replace the purge control solenoid valve.

STEP 5. Check EGR control solenoid valve itself.

• Check EGR control solenoid valve itself (Refer to 

GROUP 17 

− Emission Control System − 

Exhaust Gas Recirculation (EGR) Sys-
tem

P.17-15

).

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace the EGR control solenoid valve.

STEP 6. Check EGR valve itself.

• Check EGR valve itself (Refer to GROUP 17 − 

Emission Control System 

− Exhaust Gas Recir-

culation (EGR) System 

P.17-15

).

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Replace the EGR valve.

STEP 7. M.U.T.-II/III data list

• Refer to Data List Reference Table 

P.13A-372

.

a. Item No. 11: Oxygen sensor (front)

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Check oxygen sensor (front) system (Refer 
to Code No. P0130 

P.13A-75

).

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-282

STEP 8. Connector check: B-103 and B-114 
ignition coil connectors

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair or replace the connector.

STEP 9. Check ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 14 .

NO : 

Go to Step 10 .

STEP 10. Check spark plug.

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Replace the spark plug.

STEP 11. 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 12 .

NO : 

Replace the spark plug cable.

STEP 12. 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 13 .

NO : 

Replace the ignition coil.

STEP 13. 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 or short 

circuit or 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>