Mitsubishi Colt Ralliart. Manual - part 20

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-34

Code No. P0110: Intake Air Temperature Sensor System

OPERATION

• A power voltage of 5 V is applied to the intake air 

temperature sensor output terminal (terminal No. 
3) of the intake air temperature sensor connector 
from the engine-ECU <M/T> or engine-CVT-ECU 
<CVT> (terminal No. 56).

• The power voltage is earthed to the engine-ECU 

<M/T> or engine-CVT-ECU <CVT> (terminal No. 
33) from the intake air temperature sensor (termi-
nal No. 4).

FUNCTION

• The intake air temperature sensor converts the 

intake air temperature into a voltage and inputs 
the voltage signal to the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

• In response to the signal, the engine-ECU <M/T> 

or engine-CVT-ECU <CVT> corrects the fuel 
injection amount, etc.

• The intake air temperature sensor is a kind of 

resistor, which has characteristics to reduce its 
resistance as the intake air temperature rises. 
Therefore, the sensor output voltage varies with 
the intake air temperature, and becomes lower as 
the intake air temperature rises.

AK402677

1

2

3 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

AC 

33

56

Intake air temperature sensor
(Integrated in manifold absolute
 pressure sensor)

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

4

3

5 V

Intake Air Temperature Sensor Circuit

R-L

BR-W

A-106

A-114

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-35

TROUBLE JUDGMENT

Check Condition

• 2 seconds later after the ignition switch has been 

in ON position or the engine has started up.

Judgment Criteria

• The sensor output voltage is 4.6 V or more 

(intake air temperature of below 

−40°C or equiva-

lent) for 4 seconds.

or

• The sensor output voltage is 0.1V or less (intake 

air temperature of above 140

°C or equivalent) for 

4 seconds.

PROBABLE CAUSES

• Failed intake air temperature sensor

• Open/short circuit in intake air temperature sen-

sor circuit or loose connector contact

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

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Item 13: Intake air temperature sensor

OK: At ambient temperature (atmospheric 
temperature) or equivalent.

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-106 intake air 
temperature sensor connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check intake air temperature sensor 
itself.

• Check intake air temperature sensor itself (Refer 

to 

P.13A-361

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace intake air temperature sensor.

STEP 4. Perform resistance measurement at 
A-106 intake air temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Voltage between terminal No. 4 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 5 .

AK402005

4

3

2 1

AC

A-106

Connector: A-106

A-106 Harness side
connector

AK402005

4

3

2 1

AC

A-106

Connector: A-106

A-106 Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-36

STEP 5. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

STEP 6. Check harness between A-106 (terminal 
No. 4) intake air temperature sensor connector 
and A-114 (terminal No. 33) engine-ECU 
connector or engine-CVT-ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal? 

YES : 

Go to Step 7 .

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

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

AK402005

4

3

2 1

AC

A-106

Connector: A-106

A-106 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-37

STEP 7. M.U.T.-III data list

• Item 13: Intake air temperature sensor

OK: At ambient temperature (atmospheric 
temperature) or equivalent.

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>.

STEP 8. Perform voltage measurement at A-106 
intake air temperature sensor connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON 

• Voltage between terminal No. 3 and earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Go to Step 9 .

STEP 9. Perform voltage measurement at A-114 
engine-ECU connector or engine-CVT-ECU 
connector.

• 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.

• Disconnect A-106 intake air temperature sensor 

connector.

• Ignition switch: ON

• Voltage between terminal No. 56 and earth.

OK: 4.5 

− 4.9 V

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Go to Step 11 .

AK402005

4

3

2 1

AC

A-106

Connector: A-106

A-106 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

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

AK402005

4

3

2 1

AC

A-106

Connector: A-106

A-106 Harness side
connector

Main

Index

Group

TOC