Mitsubishi Colt Ralliart. Manual - part 24

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-50

Code No. P0122: Throttle Position Sensor (Main) Circuit Low Input

OPERATION

• A power voltage of 5 V is applied to the elec-

tronic-controlled throttle valve (terminal No. 5) 
from the engine-ECU <M/T> or engine-CVT-ECU 
<CVT> (terminal No. 31).

• The power voltage is earthed to the engine-ECU 

<M/T> or engine-CVT-ECU <CVT> (terminal No. 
30) from the electronic-controlled throttle valve 
(terminal No. 3).

• The sensor signal is inputted to the engine-ECU 

<M/T> or engine-CVT-ECU <CVT> (terminal No. 
15) from the electronic-controlled throttle valve 
output terminal (terminal No. 6).

FUNCTION

• The throttle position sensor converts the throttle 

valve position into voltage and inputs it into the 
engine-ECU <M/T> or engine-CVT-ECU <CVT>.

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

<CVT> controls the throttle valve position.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position.

Judgment Criteria

• Throttle position sensor (main) output voltage is 

0.2 V or less <M/T>.

• Throttle position sensor (main) output voltage is 

0.2 V or less for 0.5 second <CVT>.

PROBABLE CAUSES

• Failed throttle position sensor (main)

• Open/short circuit in throttle position sensor cir-

cuit or loose connector contact

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

<CVT>

AK402679

6

1 2 3 4 5

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

5 V

31

5

Electronic-controlled
throttle valve

B-W

R-W

Y-R

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

15

30

6

3

Throttle Position Sensor (main) Circuit

A-107

A-114

(main)

Hall IC

AE

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-51

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 79: Throttle position sensor (main)

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-107 
electronic-controlled throttle valve connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform voltage measurement at A-107 
electronic-controlled throttle valve connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON 

• Voltage between terminal No. 5 and earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 4 .

STEP 4. Connector check: 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.

AK402006

1

6 5 4 3 2

AC

A-107 (B)

Connector: A-107

A-107 Harness side
connector

AK402006

1

6 5 4 3 2

AC

A-107 (B)

Connector: A-107

A-107 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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-52

STEP 5. Check harness between A-107 (terminal 
No. 5) electronic-controlled throttle valve 
connector and A-114 (terminal No. 31) 
engine-ECU connector or engine-CVT-ECU 
connector.

• Check power supply line for open/short circuit.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 79: Throttle position sensor (main)

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

STEP 7. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair or replace the connector.

AK402006

1

6 5 4 3 2

AC

A-107 (B)

Connector: A-107

A-107 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

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-53

STEP 8. Check harness between A-107 (terminal 
No. 5) electronic-controlled throttle valve 
connector and A-114 (terminal No. 31) 
engine-ECU connector or engine-CVT-ECU 
connector.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

STEP 9. Check harness between A-107 (terminal 
No. 6) electronic-controlled throttle valve 
connector and A-114 (terminal No. 15) 
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 10 .

NO : 

Repair the damaged harness wire.

STEP 10. Replace the throttle body assembly

• After replacing the throttle body assembly 

re-check the trouble symptoms.

Q: Is the check result normal?

YES : 

Check end.

NO : 

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

AK402006

1

6 5 4 3 2

AC

A-107 (B)

Connector: A-107

A-107 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

AK402006

1

6 5 4 3 2

AC

A-107 (B)

Connector: A-107

A-107 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