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