Subaru Legacy IV (2008 year). Manual - part 139

EN(H4SO)(diag)-159

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check the appro-
priate DTC using 
the “List of Diag-
nostic Trouble 
Code (DTC)”. 
<Ref. to 
EN(H4SO)(diag)-
80, List of Diagnos-
tic Trouble Code 
(DTC).>

Replace the fuel 
temperature sen-
sor. <Ref. to 
EC(H4SO)-10,
Fuel Temperature 
Sensor.>

EN(H4SO)(diag)-160

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AM:DTC P0182 FUEL TEMPERATURE SENSOR “A” CIRCUIT LOW INPUT

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-71, DTC P0182 FUEL TEMPERATURE SENSOR “A”
CIRCUIT LOW INPUT, Diagnostic Trouble Code (DTC) Detecting Criteria.>

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-05707

R46

R67

B97

R1

R58

B83

30

17

*

*

2

3

4

18

B135

1

4

R58

R67

1

2

3 4 5 6

*

1 2 3 4
5 6 7 8

B83

B135

B97

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

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

29 30 31

32 33

34 35

1 2
3 4
5 6

FUEL TEMPERATURE 

SENSOR

ECM

: TERMINAL No. OPTIONAL 
  ARRANGEMENT

EN(H4SO)(diag)-161

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of fuel temperature sensor 
signal using Subaru Select Monitor.

NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO)(diag)-33, Subaru Select Moni-
tor.>

Is the temperature 120°C 
(248°F) or higher?

Go to step 2.

Even if DTC is 
detected, the cir-
cuit has returned to 
a normal condition 
at this time. Repro-
duce the failure, 
and then perform 
the diagnosis 
again.

NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.

2

CHECK HARNESS BETWEEN ECM AND 
FUEL TEMPERATURE SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and 
fuel temperature sensor.
3) Measure the resistance between ECM and 
chassis ground.

Connector & terminal

(B135) No. 17 — Chassis ground:

Is the resistance 1 M

: or 

more?

Replace the fuel 
temperature sen-
sor. <Ref. to 
EC(H4SO)-10, 
Fuel Temperature 
Sensor.>

Repair the ground 
short circuit of har-
ness between 
ECM and fuel 
pump.

EN(H4SO)(diag)-162

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AN:DTC P0183 FUEL TEMPERATURE SENSOR “A” CIRCUIT HIGH INPUT

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-72, DTC P0183 FUEL TEMPERATURE SENSOR “A”
CIRCUIT HIGH INPUT, Diagnostic Trouble Code (DTC) Detecting Criteria.>

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-05707

R46

R67

B97

R1

R58

B83

30

17

*

*

2

3

4

18

B135

1

4

R58

R67

1

2

3 4 5 6

*

1 2 3 4
5 6 7 8

B83

B135

B97

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

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

29 30 31

32 33

34 35

1 2
3 4
5 6

FUEL TEMPERATURE 

SENSOR

ECM

: TERMINAL No. OPTIONAL 
  ARRANGEMENT