Subaru Legacy III (2000-2003 year). Service 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)
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.
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.
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
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:
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