Mitsubishi Colt Ralliart. Manual - part 681

 

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Mitsubishi Colt Ralliart. Manual - part 681

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-49

STEP 8. Check harness between A-121 (terminal 
No. 1) engine coolant temperature sensor 
connector and A-114 (terminal No. 14) 
engine-ECU connector.

• Check output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair.

STEP 9. M.U.T.-III data list

• Item 21: Engine coolant temperature sensor

OK:

When the engine is cold: Nearly equal to ambi-

ent temperature (atmospheric temperature)

When the engine is hot: 80 

 120°C

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.

STEP 10. Perform resistance measurement at 
A-121 engine coolant temperature sensor 
connector.

• Disconnect connector and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: Continuity (2 

 or less)

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Go to Step 11 .

AK402085

1

2

AC

A-121(B)

Connector: A-121

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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38

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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

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

AK402085

1

2

AC

A-121(B)

Connector: A-121

Harness side 

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-50

STEP 11. Connector check: A-114 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair or replace.

STEP 12. Check harness between A-121 (terminal 
No. 2) engine coolant temperature sensor 
connector and A-114 (terminal No. 29) 
engine-ECU connector.

• Check earthing line for open circuit and damage

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair.

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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40

41

42

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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

AK402085

1

2

AC

A-121(B)

Connector: A-121

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

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39

40

41

42

43

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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-51

STEP 13. Perform voltage measurement at A-121 
engine coolant temperature sensor connector.

• Use special tool test harness (MB991658) to con-

nect connector, and measure voltage at pick-up 
harness.

• Ignition switch: ON

• Voltage between terminal No.1 and earth.

OK:

Engine coolant temperature at 

20°C: 3.9  4.5 

V

Engine coolant temperature at 0

°C: 3.2  3.8 V

Engine coolant temperature at 20

°C: 2.3  2.9 V

Engine coolant temperature at 40

°C: 1.3  1.9 V

Engine coolant temperature at 60

°C: 0.7  1.3 V

Engine coolant temperature at 80

°C: 0.3  0.9 V

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 14 .

STEP 14. Connector check: A-114 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair or replace.

AK402085

1

2

AC

A-121(B)

Connector: A-121

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-52

STEP 15. Check harness between A-121 (terminal 
No. 1) engine coolant temperature sensor 
connector and A-114 (terminal No. 14) 
engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Repair.

STEP 16. Connector check: A-114 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check and repair harness between A-121 

(terminal No. 2) engine coolant temperature 
sensor connector and A-114 (terminal No. 
29) engine-ECU connector.

• Check earthing line for damage.

NO : 

Repair or replace.

AK402085

1

2

AC

A-121(B)

Connector: A-121

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

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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37

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39

40

41

42

43

44

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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

AK402085

1

2

AC

A-121(B)

Connector: A-121

Harness side 

connector

Main

Index

Group

TOC

 

 

 

 

 

 

 

Content   ..  679  680  681  682   ..