Subaru Legacy IV (2008 year). Service manual — part 336

EN(H4DOTC)(diag)-165

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AP:DTC P0244 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A”

RANGE/PERFORMANCE

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-76, DTC P0244 TURBO/SUPER CHARGER WASTE-
GATE SOLENOID “A” RANGE/PERFORMANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Poor driving performance

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-05674

1

2

7

8 9

5

6

3

4

10 11 12

19 20 21

29

30 31

13 14 15 16 17

27

28

18

22 23

24 25

26

3

4

1

2

5

6

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

B47

1

2

4

6

3

5

B137

E

27

SBF-7

B47

B137

E64

B21

E64

2

1

B21

E2

50

48

MAIN RELAY

BATTERY

ECM

WASTEGATE CONTROL
SOLENOID VALVE

EN(H4DOTC)(diag)-166

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(H4DOTC)(diag)
-81, List of Diag-
nostic Trouble
Code (DTC).>

Replace the waste-
gate control sole-
noid valve. <Ref. to
FU(H4DOTC)-45,
Wastegate Control
Solenoid Valve.>

EN(H4DOTC)(diag)-167

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

AQ:DTC P0245 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” LOW

DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-78, DTC P0245 TURBO/SUPER CHARGER WASTE-
GATE SOLENOID “A” LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Poor driving performance

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-05674

1

2

7

8 9

5

6

3

4

10 11 12

19 20 21

29

30 31

13 14 15 16 17

27

28

18

22 23

24 25

26

3

4

1

2

5

6

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

B47

1

2

4

6

3

5

B137

E

27

SBF-7

B47

B137

E64

B21

E64

2

1

B21

E2

50

48

MAIN RELAY

BATTERY

ECM

WASTEGATE CONTROL
SOLENOID VALVE

EN(H4DOTC)(diag)-168

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ENGINE (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.

Connector & terminal

(B137) No. 27 (+) — Chassis ground (–):

Is the voltage 10 V or more?

Repair the poor
contact of ECM
connector.

Go to step 2.

2

CHECK HARNESS BETWEEN ECM AND
WASTEGATE CONTROL SOLENOID
VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
wastegate control solenoid valve.
3) Measure the resistance between wastegate
control solenoid valve connector and engine
ground.

Connector & terminal

(E64) No. 2 — Engine ground:

Is the resistance 1 M

: or

more?

Go to step 3.

Repair ground
short circuit of har-
ness between
ECM and waste-
gate control sole-
noid valve
connector.

3

CHECK HARNESS BETWEEN ECM AND
WASTEGATE CONTROL SOLENOID
VALVE.
Measure the resistance of harness between
ECM and wastegate control solenoid valve con-
nector.

Connector & terminal

(B137) No. 27 — (E64) No. 2:

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 of
harness between
ECM and waste-
gate control sole-
noid valve
connector
• Poor contact of
coupling connector

4

CHECK WASTEGATE CONTROL SOLE-
NOID VALVE.
1) Remove the wastegate control solenoid
valve.
2) Measure the resistance between wastegate
control solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the resistance between 10 —
100

:?

Go to step 5.

Replace the waste-
gate control sole-
noid valve. <Ref. to
FU(H4DOTC)-45,
Wastegate Control
Solenoid Valve.>

5

CHECK POWER SUPPLY TO WASTEGATE
CONTROL SOLENOID VALVE.
1) Turn the ignition switch to ON.
2) Measure the voltage between wastegate
control solenoid valve and engine ground.

Connector & terminal

(E64) No. 1 (+) — Engine ground (–):

Is the voltage 10 V or more?

Repair poor con-
tact in wastegate
control solenoid
valve connector.

Repair the harness
and connector.

NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
main relay and
wastegate control
solenoid valve
connector
• Poor contact of
coupling connector
• Poor contact of
main relay connec-
tor