Mitsubishi Colt Ralliart. Manual - part 43

 

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Mitsubishi Colt Ralliart. Manual - part 43

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-126

STEP 6. Check harness between A-104 (terminal 
No. 2) No. 3 injector connector and A-114 
(terminal No. 23) engine-ECU connector or 
engine-CVT-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13A-355

).

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the fuel pressure.

STEP 8. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace the engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

AK402149

M

1

2

A-104 (G)

Connector: A-104

AC

A-104 Harness side

connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

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37

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41

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47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-127

Code No. P0304: No. 4 Cylinder Misfire Detected

OPERATION

• Refer to Code No. P0204 No. 4 Injector System 

P.13A-104

.

FUNCTION

• If a misfire occurs while the engine is running, the 

engine speed changes for an instant.

• The engine-ECU <M/T> or engine-CVT-ECU 

<CVT> checks for such changes in engine 
speed.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is 500 − 4,500 r/min.

• Engine coolant temperature is −10°C or higher.

• The intake manifold pressure is above 30 kPa 

<M/T>.

• Barometric pressure is 76 kPa or higher <CVT>.

• Volumetric efficiency is between 30 % and 55 % 

<CVT>.

• Adaptive learning is complete for the vane which 

generates a crankshaft position signal.

• While the engine is running, excluding gear shift-

ing, deceleration, sudden acceleration/decelera-
tion and A/C compressor switching.

• The throttle deviation is −0.06 V/10 ms to +0.06 

V/10 ms.

Judgment Criteria (change in the angular accel-

eration of the crankshaft is used for misfire 
detection).

• Misfire has occurred more frequently than the 

limit during the last 200 revolutions (when the cat-
alyst temperature has been 950

°C or higher).

or

• Misfire has occurred 15 times or more in the last 

1,000 revolutions (that has been equivalent to 
approximately 1.5 times the emission standard).

PROBABLE CAUSES

• Ignition system related part(s) failed

• Low compression pressure

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. Visual check of ignition spark. 

• Remove the spark plug and install it to the ignition 

coil.

• Connect the ignition coil connector.

• Remove all injector connector.

• At the engine start, check each spark plug pro-

duces a spark.

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check ignition Circuit System (Refer to 
Inspection Procedure 28 

P.13A-320

).

STEP 2. Connector check: A-105 No. 4 injector 
connector

Q: Is the check result normal?

YES : 

 Go to Step 3 .

NO : 

Repair the damaged harness wire.

STEP 3. Check No. 4 injector itself.

• Check Injector itself (Refer to 

P.13A-364

).

Q: Is the check result normal?

YES : 

 Go to Step 4 .

NO : 

Replace the No. 4 injector.

AK402150

M

1

2

A-105 (G)

Connector:  A-105

AC

A-105 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-128

STEP 4. Connector check: B-106 engine control 
relay connector and A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair or replace the connector.

STEP 5. Check harness between B-106 (terminal 
No. 4) engine control relay connector and A-105 
(terminal No. 1) No. 4 injector connector. 

NOTE: Before checking harness, check intermediate 
connector A-17 and B-112, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 6 .

NO : 

Repair the damaged harness wire.

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

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28

29

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34

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47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402150

M

1

2

A-105 (G)

Connector:  A-105

AC

A-105 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-129

STEP 6. Check harness between A-105 (terminal 
No. 2) No. 4 injector connector and A-114 
(terminal No. 24) engine-ECU connector or 
engine-CVT-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13A-355

).

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the fuel pressure.

STEP 8. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace the engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

AK402150

M

1

2

A-105 (G)

Connector:  A-105

AC

A-105 Harness side

connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

 

 

 

 

 

 

 

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