Mitsubishi Colt Ralliart. Manual - part 37

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-102

STEP 6. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal? 

YES : 

Go to Step 7 .

NO : 

Repair or replace the connector.

STEP 7. Check harness between B-106 (terminal 
No. 4) engine control relay connector and A-104 
(terminal No. 1) No. 3 injector connector.

NOTE: Before checking harness, check intermediate 
connectors 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 8 .

NO : 

Repair the damaged harness wire.

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

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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

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402149

M

1

2

A-104 (G)

Connector: A-104

AC

A-104 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-103

STEP 8. 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 output line for open/short circuit and dam-

age.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

STEP 9. Perform signal wave pattern 
measurement at A-114 engine-ECU connector or 
engine-CVT-ECU connector (Using on 
oscilloscope).

• Disconnect engine-ECU connector or 

engine-CVT-ECU connector, and connect special 
tool power plant ECU check harness 
(MB991987), and then measure the voltage on 
the check connector.

• Engine: Idling

• Transmission: P range

• Voltage between terminal No. 23 and earth.

OK: Waveform should be display on Inspec-
tion procedure using an oscilloscope (Refer 
to 

P.13A-348

).

Q: Is the check result normal? 

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

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

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36

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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

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

AE

A-114

Connector: 

A-114

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

Battery

A-114 Special tool power plant ECU check 
harness

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-104

Code No. P0204: No. 4 Injector System

AK402684

2

1

3

1

2

4

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

A-114

AM

B-106

A-17

B-112

B-108

Engine
control
relay

Injector
No. 4

A-105

(MU802062)

4

6

4

1

2

2

24

No. 4 Injector Circuit

R

R

L

3

1

1

1

R

Fusible link

16

20A

J/B

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

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

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  Pu: Purple

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-105

OPERATION

• Power is supplied to the injector (terminal No. 1) 

from the engine control relay (terminal No. 4).

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

<CVT> (terminal No. 24) makes the power tran-
sistor in the unit be in ON position, and that 
makes currents go on the injector (terminal No. 
2).

FUNCTION

• The engine-ECU connector or engine-CVT-ECU 

connector controls the power supply interval of 
the injector.

• The fuel injection amount of the injector depends 

on the power supply interval.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is between 50 and 1000 r/min.

• Throttle position sensor (main) output is 1.0 V or 

less.

• Injector operation (by carrying out actuator test) 

is not in progress.

Judgment Criterion

• Injector coil surge voltage (battery positive volt-

age +2 V) has not been detected for 4 seconds.

PROBABLE CAUSES

• Failed No. 4 injector

• Open/short circuit in No. 4 injector circuit or loose 

connector contact

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

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

• Item 04: No. 4 injector

OK: Idling state varies.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

Go to Step 2 .

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

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform resistance measurement at 
A-105 No. 4 injector connector.

• Disconnect connector, and measure at injector 

side.

• Resistance between terminal No. 1 and No. 2.

OK: 14 

− 15 Ω (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace No. 4 injector.

AK402150

M

1

2

A-105 (G)

Connector:  A-105

AC

A-105 Harness side

connector

AK402167

1 2

A-105 (G)

Connector: A-105

AC

A-105 Equipment side

connector

Main

Index

Group

TOC