Subaru Legacy (2005 year). Manual - part 125

EN(H4SO 2.0)(diag)-89

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

I:

DTC P0113 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT HIGH

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03478

28

18

INTAKE AIR

TEMPERATURE

SENSOR

19

6

B21

E2

2

1

E20

E20

ECM

B21

B136

1 2 3 4
5 6 7 8

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

B136

5

6

7 8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31

35

1 2

B138

B83

B83

:LHD

B138 :RHD

*

*

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6

EN(H4SO 2.0)(diag)-90

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake air temperature 
sensor signal using Subaru Select Monitor or 
general scan tool.

NOTE:

• Subaru Select Monitor
For detailed operation procedure, refer to 
“READ CURRENT DATA FOR ENGINE”. <Ref. 
to EN(H4SO 2.0)(diag)-25, Subaru Select 
Monitor.>
• General scan tool
For detailed operation procedure, refer to the 
general scan tool operation manual.

Is the intake air temperature 
less than 

−40°C (−40°F)?

Go to step 2.

Repair the poor 
contact.

NOTE:
In this case, repair
the following item:
• Poor contact in 
intake air tempera-
ture sensor
• Poor contact in 
ECM
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

2

CHECK HARNESS BETWEEN INTAKE AIR 
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from intake air 
temperature sensor.
3) Measure the voltage between intake air 
temperature sensor connector and engine 
ground.

Connector & terminal

(B136) No. 28 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short circuit of har-
ness between 
intake air tempera-
ture sensor and 
ECM connector.

Go to step 3.

3

CHECK HARNESS BETWEEN INTAKE AIR 
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between intake air 
temperature sensor connector and engine 
ground.

Connector & terminal

(B136) No. 28 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair the battery 

short circuit of har-
ness between 
intake air tempera-
ture sensor and 
ECM connector.

Go to step 4.

4

CHECK HARNESS BETWEEN INTAKE AIR 
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
Measure the voltage between intake air tem-
perature sensor connector and engine ground.

Connector & terminal

(B136) No. 28 (+) — Engine ground (

−

):

Is the voltage more than 3 V?

Go to step 5.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of 
harness between 
intake air tempera-
ture sensor and 
ECM connector
• Poor contact in 
intake air tempera-
ture sensor
• Poor contact in 
ECM
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

EN(H4SO 2.0)(diag)-91

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

5

CHECK HARNESS BETWEEN INTAKE AIR 
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness 
between intake air temperature sensor con-
nector and engine ground.

Connector & terminal

(B136) No. 18 — Engine ground:

Is the resistance less than 5 
Ω?

Replace the intake 
air temperature 
sensor. <Ref. to 
FU(H4SO 2.0)-27, 
Intake Air Temper-
ature Sensor.>

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following item:
• Open circuit of 
harness between 
intake air tempera-
ture sensor and 
ECM connector
• Poor contact in 
intake air tempera-
ture sensor
• Poor contact in 
ECM
• Poor contact in 
joint connector

Step

Check

Yes

No

EN(H4SO 2.0)(diag)-92

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

J: DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT LOW

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Hard to start
• Erroneous idling
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03479

18

22

19

8

B136

ECM

1

2

E2

B21

E8

ENGINE

COOLANT

TEMPERATURE

SENSOR

E8

B21

1 2 3 4
5 6 7 8

1 2 3 4

12 13 14 15

5 6 7 8

16 17 18 19

9 10 11

20 21 22

23 24 25 26 27 28 29 30 31 32 33

35

34

37

36

39

38

41

40

43

42

44

45

47

46

49

48

51

50

53

52

54

B136

5

6

7 8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31

35

1 2

B138

B83

B83

:LHD

B138 :RHD

*

*

*

: TERMINAL No. RANDOM ARRANGEMENT
  AMONG 1,2,5, AND 6