Mitsubishi Colt Ralliart. Manual - part 179

TROUBLESHOOTING <CVT>

CVT

23A-59

STEP 18. Connector check: A-114 
engine-CVT-ECU connector.

AC403088AG

A-114

Connector: A-114

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

A-114 Harness side connector

Engine-CVT-ECU

Battery

(GR)

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 19.

NO : 

Repair the defective connector.

STEP 19. Check the harness between secondary 
speed sensor connector A-112 terminal No.2 and 
engine-CVT-ECU connector A-114 terminal No.45.

AC314193

Connector: A-112

AC

A-112 (B)

Transmission 
control cable

Harness side

1

2

3

AC403088AG

A-114

Connector: A-114

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

A-114 Harness side connector

Engine-CVT-ECU

Battery

(GR)

Check the output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-60

STEP 20. Measure the output wave pattern of the 
secondary speed sensor at engine-CVT-ECU 
connector A-114 (using an oscilloscope).

AC403088AF

A-114

Connector: A-114

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

A-114 Check connector (special tool)

Engine-CVT-ECU

Battery

(GR)

(1) Disconnect the engine-CVT-ECU connector, and 

connect the special tool Power plant ECU check 
harness (MB991987).

(2) Shift the selector lever to the D range.
(3) Accelerate the vehicle to approximately 50 km/h.
(4) Use the special tool Check connector to measure 

the voltage between engine-CVT-ECU connector 
A-114 terminal No.45 and earth.

OK: A wave pattern such as the one 
shown on 

P.23A-128

 (Check Procedure 

Using an Oscilloscope) should be output, 
and the maximum value should be 4.8 V 
or more and the minimum value should 
be 0.6 V or less. There should be no noise 
in the output wave pattern.

Q: Is the check result normal?

YES : 

Go to Step 21.

NO : 

Go to Step 22.

STEP 21. Measure the output wave pattern of the 
primary speed sensor at engine-CVT-ECU 
connector A-114 (using an oscilloscope).

AC403088AF

A-114

Connector: A-114

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

A-114 Check connector (special tool)

Engine-CVT-ECU

Battery

(GR)

(1) Disconnect the engine-CVT-ECU connector, and 

connect the special tool Power plant ECU check 
harness (MB991987).

(2) Shift the selector lever to the D range.
(3) Accelerate the vehicle to approximately 50 km/h.
(4) Use the special tool Check connector to measure 

the voltage between engine-CVT-ECU connector 
A-114 terminal No.43 and earth.

OK: A wave pattern such as the one 
shown on 

P.23A-128

 (Check Procedure 

Using an Oscilloscope) should be output, 
and the maximum value should be 4.8 V 
or more and the minimum value should 
be 0.6 V or less. There should be no noise 
in the output wave pattern.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Eliminate the cause of the noise.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-61

STEP 22. Check the secondary speed sensor and 
then recheck the diagnosis code.
(1) Remove the secondary speed sensor. Wipe any 

metallic particles or dirt off the sensor tip.

(2) Install the secondary speed sensor and road test 

the vehicle.

(3) Check if the diagnosis code is set.

Q: Is diagnosis code set?

YES : 

Go to Step 23.

NO : 

The inspection is complete.

STEP 23. Replace the secondary speed sensor 
and then recheck the diagnosis code.
(1) Replace the secondary speed sensor. (Refer to 

P.23A-155

).

(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.

Q: Is diagnosis code set?

YES : 

Go to Step 24.

NO : 

The inspection is complete.

STEP 24. Replace the CVT assembly and then 
recheck the diagnosis code.
(1) Replace the CVT assembly.
(2) Test drive the vehicle.
(3) Check if the diagnosis code is set.

Q: Is diagnosis code set?

YES : 

Eliminate the cause of the noise.

NO : 

The inspection is complete.

STEP 25. M.U.T.-III data list
Item 03: Primary speed sensor (Refer to Data List 
Table 

P.23A-123

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Go to Step 26.

STEP 26. Connector check: A-116 primary speed 
sensor connector.

AC314200

Connector: A-116

AC

A-116 (B)

Transmission 
control cable

Harness side

1

2

3

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 27.

NO : 

Repair the defective connector.

STEP 27. Measure the resistance at primary 
speed sensor connector A-116.

AC314200

Connector: A-116

AC

A-116 (B)

Transmission 
control cable

Harness side

1

2

3

Disconnect the connector, and measure the resist-
ance between terminal 1 and earth at the wiring har-
ness side.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 33.

NO : 

Go to Step 28.

Main

Index

Group

TOC

TROUBLESHOOTING <CVT>

CVT

23A-62

STEP 28. Measure the voltage at 
engine-CVT-ECU connector A-114.
(1) Connect primary speed sensor connector A-116.

AC403088AF

A-114

Connector: A-114

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

A-114 Check connector (special tool)

Engine-CVT-ECU

Battery

(GR)

(2) Disconnect the engine-CVT-ECU connector, and 

connect the special tool Power plant ECU check 
harness (MB991987).

(3) Turn the ignition switch to the ON position.
(4) Use the special tool Check connector to measure 

the voltage between engine-CVT-ECU connector 
A-114 terminal No.60 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES : 

Go to Step 31.

NO : 

Go to Step 29.

STEP 29. Connector check: A-114 
engine-CVT-ECU connector.

AC403088AG

A-114

Connector: A-114

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

A-114 Harness side connector

Engine-CVT-ECU

Battery

(GR)

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 30.

NO : 

Repair the defective connector.

STEP 30. M.U.T.-III data list
Item 03: Primary speed sensor (Refer to Data List 
Table 

P.23A-123

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

).

NO : 

Replace the engine-CVT-ECU.

Main

Index

Group

TOC