Subaru Legacy III (2000-2003 year). Service manual — part 482
EN(H4DOSTC)-98
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
K: DTC P0117 — ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT —
• TROUBLE SYMPTOM:
• Hard to start
• 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-00936
B122
B135 ECM
19
18
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
2
1
6
1
17
18
E8
1 2
3
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
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B122
1 2 3 4 5 6
B21
E2
B21
EN(H4DOSTC)-99
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 engine coolant tempera-
ture sensor signal using Subaru Select
Monitor.
Does the measured value exceed the spec-
ified value?
NOTE:
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOSTC)-26, Subaru Select Monitor.>
120
°
C (248
°
F)
Repair the poor
contact.
NOTE:
In this case, repair
the following:
• Poor contact in
engine coolant
temperature sen-
sor
• Poor contact in
ECM
• Poor contact in
coupling connector
• Poor contact in
joint connector
2
CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from engine cool-
ant temperature sensor.
3) Turn the ignition switch to ON.
4) Read the data of engine coolant tempera-
ture 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.>
−
40
°
C (
−
40
°
F)
Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4DOSTC)-
28, Engine Cool-
ant Temperature
Sensor.>
Repair the ground
short circuit in har-
ness between
engine coolant
temperature sen-
sor and ECM con-
nector.
EN(H4DOSTC)-100
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
L: DTC P0118 — ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT —
• TROUBLE SYMPTOM:
• Hard to start
• 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-00936
B122
B135 ECM
19
18
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
2
1
6
1
17
18
E8
1 2
3
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
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B122
1 2 3 4 5 6
B21
E2
B21
EN(H4DOSTC)-101
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 engine coolant tempera-
ture 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.>
−
40
°
C (
−
40
°
F)
Repair the poor
contact.
NOTE:
In this case, repair
the following:
• Poor contact in
engine coolant
temperature sen-
sor
• Poor contact in
ECM
• Poor contact in
coupling connector
• Poor contact in
joint connector
2
CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from engine cool-
ant temperature sensor.
3) Measure the voltage between engine cool-
ant temperature sensor connector and
engine ground.
Connector & terminal
(E8) No. 2 (+) — Engine ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair the battery
short circuit in har-
ness between
ECM and engine
coolant tempera-
ture sensor con-
nector.
3
CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between engine cool-
ant temperature sensor connector and
engine ground.
Connector & terminal
(E8) No. 2 (+) — Engine ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
10 V
Repair the battery
short circuit in har-
ness between
ECM and engine
coolant tempera-
ture sensor con-
nector.
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