Mitsubishi Outlander (2003+). Manual - part 63

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-115

œ

The volumetric efficiency is 30 

-

 60%.

œ

The adaptive learning has been completed with 
the vane that generates the crankshaft position 
signals.

œ

During the engine operation except the shift 
change or low speed driving and rapid accelera-
tion and deceleration, also intermittent operation 
of air compressor (A/C: within the 3 seconds after 
changing to ON from OFF or to OFF from ON).

œ

The throttle deviation is within the range of 

-

 

0.059 V/10ms to 0.059 V/10ms.

Judgment Criterion

œ

The number of misfiring (in the catalyst tempera-
ture of above 950

•

C) is beyond the specified 

number (of 7.3 % on more than the two cylinders) 
with the engine speed of 200 r/min.

Or

œ

The number of misfiring (that is 1.5 times the 
emission standard limit) is beyond the specified 
number (of 2 % on more than the two cylinders) 
with the engine speed of 1,000 r/min.

PROBABLE CAUSE

œ

Ignition system related part(s) failed

œ

Low compression pressure

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1.Check ignition coil spark. 

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check ignition circuit system (Refer to 
Inspection procedure 29 

3

13A



).

STEP 2.Connector check: B-04 No.3 injector 
connector

Q: Is the check result normal?

YES : 

 Go to Step 3 .

NO : 

Repair.

STEP 3.Check No.3 injector itself.

œ

Check Injector itself (Refer to 

3

13A



).

Q: Is the check result normal?

YES : 

 Go to Step 4 .

NO : 

Replace No.3 injector.

STEP 4.Connector check: B-17X engine control 
relay connector, B-134 engine-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair.

AK300265

M

1

2

Harness side connector

Connector: B-04

AE

B-04 (GR)

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-116

STEP 5.Check harness between B-17X (terminal 
No. 1) engine control relay connector and B-04 
(terminal No. 1) No.3 injector connector. 

œ

Check power supply line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 6 .

NO : 

Repair.

STEP 6. Check harness between B-04 (terminal 
No. 2) No.3 injector connector and C-134 
(terminal No. 2) engine-ECU connector

œ

Check output line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Repair.

STEP 7. Measure fuel pressure.

œ

Measure fuel pressure (Refer to fuel pressure 
test 

3

13A



)

Q: Is the check result normal?

YES : 

 Replace engine-ECU.

NO : 

Repair.

Code No. P0304: No. 4 cylinder mis-fire detection system

OPERATION

œ

Refer to P0204 injector circuit 

3

13A



.

FUNCTION

œ

If a misfire occurs while the engine is running, the 
engine speed changes for an instant.

œ

The engine-ECU checks for such changes in 
engine speed.

TROUBLE JUDGMENT

Check Conditions

œ

5 seconds later after the engine has started up.

œ

The engine speed is 500 

-

 4,500 r/min.

œ

The engine coolant temperature is 

-

10

•

C or 

higher.

œ

The intake air temperature is 

-

10

•

C or higher.

œ

The barometric pressure is 72 kPa or more.

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

Harness side
connector

AK300265

M

1

2

Harness side connector

Connector: B-04

AE

B-04 (GR)

AK300265

M

1

2

Harness side connector

Connector: B-04

AE

B-04 (GR)

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-117

œ

The volumetric efficiency is 30 

-

 60%.

œ

The adaptive learning has been completed with 
the vane that generates the crankshaft position 
signals.

œ

During the engine operation except the shift 
change or low speed driving and rapid accelera-
tion and deceleration, also intermittent operation 
of air compressor (A/C: within the 3 seconds after 
changing to ON from OFF or to OFF from ON).

œ

The throttle deviation is within the range of 

-

 

0.059 V/10ms to 0.059 V/10ms.

Judgment Criterion

œ

The number of misfiring (in the catalyst tempera-
ture of above 950

•

C) is beyond the specified 

number (of 7.3 % on more than the two cylinders) 
with the engine speed of 200 r/min.

Or

œ

The number of misfiring (that is 1.5 times the 
emission standard limit) is beyond the specified 
number (of 2 % on more than the two cylinders) 
with the engine speed of 1,000 r/min.

PROBABLE CAUSE

œ

Ignition system related part(s) failed

œ

Low compression pressure

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1.Check the ignition coil spark.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check ignition Circuit System (Refer to 
Inspection procedure 29 

3

13A



).

STEP 2.Connector check: B-05 No.4 injector 
connector

Q: Is the check result normal?

YES : 

 Go to Step 3 .

NO : 

Repair.

STEP 3.Check No.4 injector itself.

œ

Check Injector itself (Refer to 

3

13A



).

Q: Is the check result normal?

YES : 

 Go to Step 4 .

NO : 

Replace No.4 injector.

STEP 4.Connector check: B-17X engine control 
relay connector and B-134 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair.

AK300265

M

1

2

Harness side connector

Connector: B-05

AF

B-05 (GR)

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-118

STEP 5.Check harness between B-17X (terminal 
No. 1) engine control relay connector and B-05 
(terminal No. 1) No.4 injector connector. 

œ

Check power supply line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 6 .

NO : 

Repair.

STEP 6. Check harness between B-05 (terminal 
No. 2) No.4 injector connector and C-134 
(terminal No. 15) engine-ECU connector.

œ

Check output line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Repair.

STEP 7. Measure fuel pressure.

œ

Measure fuel pressure (Refer to fuel pressure 
test 

3

13A



)

Q: Is the check result normal?

YES : 

 Replace engine-ECU.

NO : 

Repair.

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

Harness side
connector

AK300265

M

1

2

Harness side connector

Connector: B-05

AF

B-05 (GR)

AK300265

M

1

2

Harness side connector

Connector: B-05

AF

B-05 (GR)

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