Subaru Legacy IV (2008 year). Manual - part 555

EN(H6DO)(diag)-193

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

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

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-78, 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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

B83

30

17

B135

R58

R67

R46

R1

B97

B97

R67

R58

B135

2

3

1

4

4

18

B83

1

2

3 4 5 6

1 2
3 4
5 6

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

3 4

5 6

1 2

7 8

*

*

*

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

EN-05659

FUEL PUMP ASSY

FUEL TEMPERATURE 
SENSOR

ECM

: TERMINAL No. OPTIONAL 
  ARRANGEMENT

EN(H6DO)(diag)-194

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(H6DO)(diag)-34, 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(H6DO)-10, 
Fuel Temperature 
Sensor.>

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

EN(H6DO)(diag)-195

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

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

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-79, 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(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

B83

30

17

B135

R58

R67

R46

R1

B97

B97

R67

R58

B135

2

3

1

4

4

18

B83

1

2

3 4 5 6

1 2
3 4
5 6

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

3 4

5 6

1 2

7 8

*

*

*

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

EN-05659

FUEL PUMP ASSY

FUEL TEMPERATURE 
SENSOR

ECM

: TERMINAL No. OPTIONAL 
  ARRANGEMENT

EN(H6DO)(diag)-196

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(H6DO)(diag)-34, Subaru Select Moni-
tor.>

Is the temperature less than 
–40°C (–40°F)?

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 POOR CONTACT.
Repair any poor contact between the ECM and 
fuel temperature sensor connectors.

Is there poor contact in the 
ECM or fuel temperature sen-
sor connectors?

Repair any poor 
contact between 
the ECM and fuel 
temperature sen-
sor connectors.

Go to step 3.

3

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 of the harness 
between the ECM and fuel temperature sensor 
connector.

Connector & terminal

(B135) No. 17 — (R58) No. 2:
(B135) No. 30 — (R58) No. 3:

Is the resistance less than 1 

:? Go to step 4.

Repair the harness 
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and fuel tem-
perature sensor
connector
• Poor contact of
coupling connector

4

CHECK HARNESS BETWEEN ECM AND 
FUEL TEMPERATURE SENSOR CONNEC-
TOR.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B135) No. 17 (+) — Chassis ground (–):

Is the voltage 5 V or more?

Repair the short 
circuit to power in 
the harness 
between the ECM 
and fuel tempera-
ture sensor con-
nector.

Replace the fuel 
temperature sen-
sor. <Ref. to 
EC(H6DO)-10,
Fuel Temperature 
Sensor.>