Subaru Legacy (2005 year). Manual - part 453

EN(H6DO)(diag)-125

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Y: 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, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.
WIRING DIAGRAM:

EN-03496

B83

B3

BATTERY

E

B83

1

B3

MASS AIR FLOW AND INTAKE 
AIR TEMPERATURE SENSOR

ECM

B136

SBF-7

1 2 3 4 5

3

4

1

2

5

6

B136

B47

*

*

2

4

3

5

31

13

23

35

32

MAIN  RELAY

B47

1 2 3 4
5 6 7 8

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

6
4

 : TERMINAL No.
   RANDOM ARRANGEMENT

*

EN(H6DO)(diag)-126

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 mass air flow and 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(H6DO)(diag)-26, Subaru Select Moni-
tor.>
• 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:
• Poor contact in 
mass air flow and 
intake air tempera-
ture sensor
• Poor contact in 
ECM
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

2

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

Connector & terminal

(B3) No. 4 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair battery 

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

Go to step 3.

3

CHECK HARNESS BETWEEN MASS AIR 
FLOW AND INTAKE AIR TEMPERATURE 
SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between mass air flow 
and intake air temperature sensor connector 
and engine ground.

Connector & terminal

(B3) No. 4 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Repair battery 

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

Go to step 4.

4

CHECK HARNESS BETWEEN MASS AIR 
FLOW AND INTAKE AIR TEMPERATURE 
SENSOR AND ECM CONNECTOR.
Measure the voltage between mass air flow 
and intake air temperature sensor connector 
and engine ground.

Connector & terminal

(B3) No. 4 (+) — 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:
• Open circuit of 
harness between 
mass air flow and 
intake air tempera-
ture sensor and 
ECM connector
• Poor contact in 
mass air flow and 
intake air tempera-
ture sensor
• Poor contact in 
ECM
• Poor contact in 
coupling connector
• Poor contact in 
joint connector

EN(H6DO)(diag)-127

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

5

CHECK HARNESS BETWEEN MASS AIR 
FLOW AND INTAKE AIR TEMPERATURE 
SENSOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness 
between mass air flow and intake air tempera-
ture sensor connector and engine ground.

Connector & terminal

(B3) No. 5 — Engine ground:

Is the resistance less than 5 
Ω?

Replace the mass 
air flow and intake 
air temperature 
sensor. <Ref. to 
FU(H6DO)-24, 
Mass Air Flow and 
Intake Air Temper-
ature Sensor.>

Repair the har-
ness and connec-
tor.

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

Step

Check

Yes

No

EN(H6DO)(diag)-128

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Z: 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, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE, 
Inspection Mode.>.
WIRING DIAGRAM:

EN-03498

*

*

B83

35

14

19

8

B136

ECM

1

2

E2

B21

E8

ENGINE

COOLANT

TEMPERATURE

SENSOR

E8

B21

1 2 3 4
5 6 7 8

B83

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

*

 : TERMINAL No. RANDOM ARRANGEMENT

1 2