Mitsubishi Outlander (2003+). Manual — part 91

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-227

STEP 11. Measure voltage at C-135 engine-ECU
connector.

œ

Disconnect connector, and measure at harness
side.

œ

Ignition switch: ON

œ

Voltage between terminal No. 33 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Check and repair harness between B-19

(terminal No. 4) intermediate connector and
C-135 (terminal No. 33) engine-ECU
connector.

œ

Check output line for short circuit.

STEP 12. Measure voltage at C-135 engine-ECU
connector.

œ

Measure engine-ECU terminal voltage.

œ

Engine: Idling after warm-up

œ

Transmission: Neutral

œ

Radiator fan: Inactive

œ

Voltage between terminal No. 8 and earth.

OK: Switching the headlamps to ON from
OFF causes the voltage to increase by 0.2

-

3.5 V.

Q: Is the check result normal?

YES :

Go to Step 13 .

NO :

Check alternator.

STEP 13. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

AK300256

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

AB

CONNECTOR: C-135

C-135

Harness side connector

AK300295

1 2 3

4 5 6

AB

CONNECTOR: B-19

B-19 (B)

Male side
connector

AK300256

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

AB

CONNECTOR: C-135

C-135

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-228

Inspection Procedure 20: Overheating

COMMENT ON TROUBLE SYMPTOM

œ

Failure is possibly caused by failed engine cool-
ing system, failed fan controller, failed engine
coolant temperature sensor or other faults.

PROBABLE CAUSE

œ

Insufficient or deteriorated engine coolant

œ

Failed fan controller

œ

Failed engine coolant temperature sensor

œ

Failed thermostat

œ

Failed water pump

œ

Failed radiator core

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II self-diag code

Q: Diagnosis code set?

YES :

Inspection chart for diagnosis code (Refer

to

3

13A

).

NO :

Go to Step 2 .

STEP 2. Check engine coolant

NOTE: If engine coolant level falls too early, check
for leaky spots, and repair if necessary.

œ

Check engine coolant (Refer to GROUP 14

-

On-

vehicle Service

3

14

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace or add engine coolant.

STEP 3. MUT-II actuator test

œ

Item 21: Fan controller

OK: Fan motor rotating

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Check fan control relay system (Refer to
Inspection Procedure 25

3

13A

).

STEP 4. MUT-II Data List

œ

Item 21: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature

(atmospheric temperature) or equivalent.

Engine hot state: At 80

-

120

•

C

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Check engine coolant temperature sensor
system (Refer to Code No. P0115

3

13A

).

STEP 5. Check thermostat.

œ

Check thermostat (Refer to GROUP 14

-

Ther-

mostat

3

14

).

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Replace thermostat.

STEP 6. Check water pump.

œ

Check water pump.

Q: Is the check result normal?

YES :

Replace radiator.

NO :

Replace water pump.

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-229

Inspection Procedure 21: Abnormal Rotation of Fan Motor

OPERATION

œ

The control (duty) signal is inputted to the fan
controller (terminal No. 2) from the engine-ECU
(terminal No. 21).

FUNCTION

œ

The engine-ECU inputs a duty signal suitable for
the engine coolant temperature, vehicle speed
and A/C switch position to the fan controller. In
response to the signal, the fan controller controls
the rotating speeds of the radiator fan and A/C
condenser fan (The fan speed becomes higher
as the average voltage of the terminal comes
nearer to 5V).

PROBABLE CAUSE

œ

Failed fan controller

œ

Open/short circuit in fan controller circuit or loose
connector contact

œ

Failed engine-ECU

AK300309

2 3

1

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

3

10 11

5 V

AB

Engine-ECU

Fan controller

A-20
(MU802322)

2

L-W

L-W

7
A-14

21

C-134

Fan controller (Radiator fan, A/C condensor fan) Circuit

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V:Violet

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-230

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-134 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair.

STEP 2. Check at C-134 engine-ECU connector.

œ

Disconnect connector, and measure at harness
side.

œ

Ignition switch: ON

œ

Short-circuit terminal No. 21 to earth.

OK: Fan motor stops rotating.

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Go to Step 4 .

STEP 3. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

STEP 4. Measure voltage at C-134 engine-ECU
connector.

œ

Disconnect connector, and measure at harness
side.

œ

Ignition switch: ON

œ

Voltage between terminal No. 21 and earth.

OK: 4.9

-

5.1 V

Q: Is the check result normal?

YES :

Replace fan controller.

NO :

Go to Step 5 .

STEP 5. Connector check: A-20 fan controller
connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair.

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK203423

1

2

3

Harness side
connector

A-20 (GR)

AC

Connector: A-20