Subaru Legacy (2005 year). Manual - part 204

 

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Subaru Legacy (2005 year). Manual - part 204

 

 

EN(H4SO 2.5)(diag)-101

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

J: DTC P0112 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT LOW

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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model

• KA and KS model

NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

EN-03459

B3

BATTERY

E

1

B3

MASS AIR FLOW AND 

INTAKE AIR TEMPERATURE

SENSOR

ECM

B136

SBF-7

3

4

1

2

5

6

B47

2

4

3

5

31

13

23

35

32

MAIN RELAY

B47

1

2

6

3

5

1 2 3 4
5 6 7 8

B83

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

B83

*

1 2 3 4 5

4

*

EN(H4SO 2.5)(diag)-102

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH, 
ER or K4?

Go to step 2.

Refer to EN(H4SO 
2.0) section. <Ref. 
to EN(H4SO 
2.0)(diag)-64, List 
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

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(H4SO 2.5)(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 
more than 120

°C (248°F)?

Go to step 3.

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

3

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) Turn the ignition switch to ON.
4) 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(H4SO 2.5)(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)?

Replace the mass 
air flow and intake 
air temperature 
sensor. <Ref. to 
FU(H4SO 2.5)-26, 
Mass Air Flow and 
Intake Air Temper-
ature Sensor.>

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

EN(H4SO 2.5)(diag)-103

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

K: 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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model

• KA and KS model

NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

EN-03459

B3

BATTERY

E

1

B3

MASS AIR FLOW AND 

INTAKE AIR TEMPERATURE

SENSOR

ECM

B136

SBF-7

3

4

1

2

5

6

B47

2

4

3

5

31

13

23

35

32

MAIN RELAY

B47

1

2

6

3

5

1 2 3 4
5 6 7 8

B83

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

B83

*

1 2 3 4 5

4

*

EN(H4SO 2.5)(diag)-104

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH, 
ER or K4?

Go to step 2.

Refer to EN(H4SO 
2.0) section. <Ref. 
to EN(H4SO 
2.0)(diag)-64, List 
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

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(H4SO 2.5)(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 3.

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

3

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 the 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.
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 the battery 

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

Go to step 5.

 

 

 

 

 

 

 

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