Mitsubishi Colt Ralliart. Manual — part 701

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-129

STEP 8. M.U.T.-III diagnosis code.

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES :

Replace engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunctions

P.00-13

).

Code No. P0302: No. 2 Cylinder Misfire Detected

OPERATION

• Refer to Code No. P0202 No. 2 Injector System

P.13B-97

.

FUNCTION

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

engine speed changes for an instant.

• The engine-ECU checks for such changes in

engine speed.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is more than 500 r/min and is less

than 4,500 r/min.

• Engine coolant temperature is more than -10°C.

• Volume efficiency is more than 35%

• Adaptive learning is completed for the vane

which generates a crankshaft position signal.

• While the engine is running, excluding gear shift-

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

• When the variation in the throttle valve opening

angle is small.

Judgement Criterion

• Misfire occurred more frequently than the limit

during the last 200 revolutions

Or

• Misfire occurred more than the limit during the

last 1,000 revolutions

PROBABLE CAUSES

• Ignition system related part(s) failed

• Low compression pressure

• Failed fuel system

• 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 26

P.13B-327

).

STEP 2. Check connector: A-103 No. 2 injector
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Check No. 2 injector itself.

• Check Injector itself (Refer to

P.13B-367

).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace the No. 2 injector.

AK402089

M

1

2

A-103(G)

AC

Connector: A-103

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-130

STEP 4. Connector check: B-106 engine control
relay connector and A-114 engine-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-103
(terminal No. 1) No. 2 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

AK402084

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

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

AF

A-114

Connector:

A-114

Harness side connector

Engine-ECU

Battery

3

2

1

4

AK402084

J/B side
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402089

M

1

2

A-103(G)

AC

Connector: A-103

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-131

STEP 6. Check harness between A-103 (terminal
No. 2) No. 2 injector connector and A-114
(terminal No. 9) engine-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.13B-358

).

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 engine-ECU.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use Troubleshooting/Inspection

Service Points

− How to Cope with

Intermittent Malfunctions

P.00-13

).

AK402089

M

1

2

A-103(G)

AC

Connector: A-103

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

AF

A-114

Connector:

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-132

Code No. P0303: No. 3 Cylinder Misfire Detected

OPERATION

• Refer to Code No. P0203 No. 3 Injector System

P.13B-102

.

FUNCTION

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

engine speed changes for an instant.

• The engine-ECU checks for such changes in

engine speed.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is more than 500 r/min and is less

than 4,500 r/min.

• Engine coolant temperature is more than -10°C.

• Volume efficiency is more than 35%

• Adaptive learning is completed for the vane

which generates a crankshaft position signal.

• While the engine is running, excluding gear shift-

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

• When the variation in the throttle valve opening

angle is small.

Judgement Criterion

• Misfire occurred more frequently than the limit

during the last 200 revolutions

Or

• Misfire occurred more than the limit during the

last 1,000 revolutions

PROBABLE CAUSES

• Ignition system related part(s) failed

• Low compression pressure

• Failed fuel system

• 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 26

P.13B-327

).

STEP 2. Connector check: A-104 No. 3 injector
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Check No. 3 injector itself.

• Check Injector itself (Refer to

P.13B-367

).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace the No. 3 injector.

AK402090

M

1

2

A-104(G)

AC

Connector: A-104

Harness side
connector

Main

Index

Group

TOC