Subaru Legacy III (2000-2003 year). Manual — part 334

EN(H6DO)-138

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

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

• 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)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.

• WIRING DIAGRAM:

EN-00812

13

10

B20

E1

INTAKE AIR

TEMPERATURE

SENSOR

E20

B20

27

19

B135

B83

1

2

E20

5

8

ECM

B83

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

1 2

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

1 2 3 4

5 6 7 8 9 10

11 12

19 20

13 14 15 16 17 18

EN(H6DO)-139

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK CURRENT DATA.
1) Turn ignition switch to ON.
2) Start engine.
3) Read data of intake air temperature sensor

signal using Subaru Select Monitor or the
OBD-II general scan tool.
Is the measured value less than the speci-
fied value?

NOTE:

• Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
• OBD-II general scan tool
For detailed operation procedure, refer to the
OBD-II General Scan Tool Instruction Manual.

−

40

°

C (

−

40

°

F)

Go to step 2.

Repair poor con-
tact.

NOTE:
In this case, repair
the following:
• 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 ignition switch to OFF.
2) Disconnect connector from intake air tem-

perature sensor.

3) Measure voltage between intake air tem-

perature sensor connector and engine
ground.

Connector & terminal

(E20) No. 1 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair battery
short circuit in 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 ignition switch to ON.
2) Measure voltage between intake air tem-

perature sensor connector and engine
ground.

Connector & terminal

(E20) No. 1 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair battery
short circuit in 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 voltage between intake air tempera-
ture sensor connector and engine ground.

Connector & terminal

(E20) No. 1 (+) — Engine ground (

−−−−

):

Does the measured value exceed the specified
value?

3 V

Go to step 5.

Repair harness
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in
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(H6DO)-140

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

5

CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Measure resistance of harness between

intake air temperature sensor connector
and engine ground.

Connector & terminal

(E20) No. 2 — Engine ground:

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

5

Ω

Replace intake air
temperature sen-
sor. <Ref. to
FU(H6DO)-35,
Intake Air Temper-
ature Sensor.>

Repair harness
and connector.

NOTE:
In this case, repair
the following:

• Open circuit in
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

Step

Value

Yes

No

EN(H6DO)-141

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO: