Mitsubishi Lancer Evolution IX. Manual - part 464

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-331

OPERATION

• The battery voltage is applied on the engine-ECU 

(terminal No. 31) form the condenser fan control 
relay (low).

• The battery is applied on the engine-ECU (termi-

nal No. 30) from the condenser fan control relay 
(high).

FUNCTION

• The engine-ECU condenser fan control relay 

turns "ON" with the signal from the engine-ECU, 
and power is supplied to the condenser fan 
motor.

PROBABLE CAUSES

• Failed condenser fan relay (high)

• Failed condenser fan relay (low)

• Failed condenser fan motor

• Open/short circuit in condenser fan control relay 

circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

NOTE: 

.

*1: L.H. drive vehicles
*2: R.H. drive vehicles

STEP 1. Check condenser fan motor.

• Check condenser fan motor (Refer to GROUP 55 

− Heater, Air conditioner and Ventilation 
−Condenser and condenser fan motor − Inspec-
tion 

P.55-127

).

Q: Is the check result normal? 

YES : 

Go to Step 2 .

NO : 

Replace the condenser fan motor.

STEP 2. M.U.T.-II/III actuator test

• Item No. 38: Condenser fan (low)

OK: Condenser fan motor rotates (low)

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Go to Step 14 .

STEP 3. Connector check: A-06X condenser fan 
relay (low) connector.

Q: Is the check result normal? 

YES : 

Go to Step 4 .

NO : 

Repair or replace the connector.

STEP 4. Check condenser fan relay (low).

• Check condenser fan relay (low) (Refer to 

GROUP 55 

− On-vehicle Service 

P.55-107

).

Q: Is the check result normal? 

YES : 

Go to Step 5 .

NO : 

Replace the condenser fan relay (low).

STEP 5. Perform voltage measurement at A-06X 
condenser fan relay (low) connector.

• Remove relay, and measure at relay box side.

• Ignition switch: "ON"

• Voltage between terminal No. 2 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Go to Step 8 .

NO : 

Go to Step 6 .

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-332

STEP 6. Connector check: C-208 ignition switch 
connector.

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Repair or replace the connector.

STEP 7. Check ignition switch.

• Check ignition switch (Refer to GROUP 54A − 

Ignition switch 

− Ignition switch − Inspection 

P.54A-30

).

Q: Is the check result normal? 

YES : 

Check intermediate connectors C-101, 

C-129, C-210 and C-211, and repair if 
necessary. If intermediate connectors are 
normal, check and repair harness between 
A-06X (terminal No. 2) condenser fan relay 
(low) connector and C-208 (terminal No. 4) 
ignition switch connector.

• Check power supply for open circuit 

and damage.

NO : 

Replace the ignition switch.

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

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-333

STEP 8. Perform voltage measurement at A-06X 
condenser fan relay (low) connector.

• Remove relay, and measure at relay box side.

• Voltage between terminal No. 4 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Check and repair harness between battery 

and A-08X (terminal No. 4) condenser fan 
relay connector.

• Check power supply for open circuit 

and damage.

NO : 

Go to Step 9 .

STEP 9. Perform voltage measurement at C-121 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Ignition switch: "ON"

• Voltage between terminal No. 31 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 10 .

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

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-334

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

Q: Is the check result normal? 

YES : 

Check intermediate connectors A-29*

1

 or 

C-31*

2

, and repair if necessary. If 

intermediate connectors are normal, check 
and repair harness between A-06X (terminal 
No. 3) condenser fan relay (low) connector 
and C-121 (terminal No. 31) engine-ECU 
connector.

• Check power supply for open circuit 

and damage.

NO : 

Repair or replace the connector.

STEP 11. Perform voltage measurement at A-34 
condenser fan motor connector.

• Disconnect connector, and measure at harness 

side.

• Disconnect C-121 engine-ECU connector, and 

earth terminal No. 31.

• Ignition switch: "ON"

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>

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

AK305266

1

2

A-34(B)

AB

Harness side 
connector

Connector: A-34

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

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>