Subaru Legacy (2005 year). Service manual — part 125
EN(H4SO 2.0)(diag)-89
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
I:
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, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03478
28
18
INTAKE AIR
TEMPERATURE
SENSOR
19
6
B21
E2
2
1
E20
E20
ECM
B21
B136
1 2 3 4
5 6 7 8
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
1 2
B138
B83
B83
:LHD
B138 :RHD
*
*
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
EN(H4SO 2.0)(diag)-90
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 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 2.0)(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)?
Repair the poor
contact.
NOTE:
In this case, repair
the following item:
• 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 the ignition switch to OFF.
2) Disconnect the connector from intake air
temperature sensor.
3) Measure the voltage between intake air
temperature sensor connector and engine
ground.
Connector & terminal
(B136) No. 28 (+) — Engine ground (
−
):
Is the voltage more than 10 V? Repair the battery
short circuit of 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 the ignition switch to ON.
2) Measure the voltage between intake air
temperature sensor connector and engine
ground.
Connector & terminal
(B136) No. 28 (+) — Engine ground (
−
):
Is the voltage more than 10 V? Repair the battery
short circuit of har-
ness between
intake air tempera-
ture sensor and
ECM connector.
4
CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
Measure the voltage between intake air tem-
perature sensor connector and engine ground.
Connector & terminal
(B136) No. 28 (+) — Engine ground (
−
):
Is the voltage more than 3 V?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
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(H4SO 2.0)(diag)-91
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
5
CHECK HARNESS BETWEEN INTAKE AIR
TEMPERATURE SENSOR AND ECM CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between intake air temperature sensor con-
nector and engine ground.
Connector & terminal
(B136) No. 18 — Engine ground:
Is the resistance less than 5
Ω?
Replace the intake
air temperature
sensor. <Ref. to
FU(H4SO 2.0)-27,
Intake Air Temper-
ature Sensor.>
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
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
joint connector
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-92
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
J: 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, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03479
18
22
19
8
B136
ECM
1
2
E2
B21
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
E8
B21
1 2 3 4
5 6 7 8
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
1 2
B138
B83
B83
:LHD
B138 :RHD
*
*
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
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