Subaru Legacy III (2000-2003 year). Manual - part 481

EN(H4DOSTC)-94

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

J: DTC P0113 — INTAKE AIR TEMPERATURE CIRCUIT HIGH INPUT —

• TROUBLE SYMPTOM:

• Erroneous idling
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection 
Mode.> .
• WIRING DIAGRAM:

EN-00951

B122

B3

B135

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

BATTERY

E

B122

1

B3

MASS  AIR  FLOW  AND 
INTAKE AIR TEMPERATURE

ECM

B135

B :

B84

E :

SBF-5

1 2 3 4 5

3

4

1

2

5

6

1 2 3 4 5 6

B84

B47

2
6

2

4

3

5

E7

B27

E13

B19

E8

1 2 3

8 9 10

4

11 12

13 14 15

16

5 6

7

17

MAIN  RELAY

B47

1

2

3

5

4

6

EN(H4DOSTC)-95

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake air temperature 

sensor signal using Subaru Select Monitor.
Is the measured value less than the speci-
fied value?

NOTE:

For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOSTC)-26, Subaru Select Monitor.>

−

36

°

C (

−

97

°

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 
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  connec-
tor and engine ground.

Connector & terminal

(B3) No. 2 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair the battery 
short circuit in 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  connec-
tor and engine ground.

Connector & terminal

(B3) No. 2 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair the battery 
short circuit in 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 and pres-
sure sensor connector and engine ground.

Connector & terminal

(B3) No. 2 (+) — Engine ground (

−−−−

):

Does the measured value exceed the specified 
value?

4 V

Go to step 5.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit in 
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

EN(H4DOSTC)-96

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 tem-
perature sensor and engine ground.

Connector & terminal

(B3) No. 5 — Engine ground:

Is the measured value less than the speci-
fied value?

5 

Ω

Replace the mass 
air flow and intake 
air temperature 
sensor.  <Ref. to 
FU(H4DOSTC)-
33, Mass Air Flow 
and Intake Air 
Temperature Sen-
sor.>

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:

• Open circuit in 
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

Value

Yes

No

EN(H4DOSTC)-97

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO: