Subaru Legacy III (2000-2003 year). Manual - part 487

EN(H4DOSTC)-118

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

R: DTC P0245 — TURBO/SUPER CHARGERWASTEGATESOLENOID “A” LOW 

—

• TROUBLE SYMPTOM:

• Erroneous idling

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-00938

MAIN  RELAY

B47

1

2

3

5

4

6

BATTERY

E

B47

B137

F81

F44

B137

F81

       WASTEGATE
CONTROL  SOLENOID
            VALVE

ECM

24

1

2

SBF-5

3

4

1

2

5

6

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

1 2

B62

F45

B62

B61

F44

1

5

21

9

32

1 2 3 4

5 6

10 11 12 13 14 15

7

16

23

30

19 20

22

26 27 28 29

8

17

24

31

18

25

1 2

3

4 5 6 7 8

EN(H4DOSTC)-119

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

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

chassis ground.

Connector & terminal

(B137) No. 24 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Even if MI lights 
up, the circuit has 
returned to a nor-
mal condition at 
this time. Contact 
with your Subaru 
distributor.

NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.

Go to step 2.

2

CHECK HARNESS BETWEEN WASTEGATE 
CONTROL SOLENOID VALVE AND ECM 
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from wastegate 

control solenoid valve and ECM.

3) Measure the resistance of harness 

between wastegate control solenoid valve 
connector and engine ground.

Connector & terminal

(F81) No. 1 — Engine ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 3.

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

3

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

Connector & terminal

(B137) No. 24 — (F81) No. 1:

Is the measured value less than the specified 
value?

1 

Ω

Go to step 4.

Repair the open 
circuit in harness 
between ECM and 
wastegate control 
solenoid valve 
connector.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
ECM and waste-
gate control sole-
noid valve 
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 measured value within the specified 
value?

30 — 34 

Ω

Go to step 5.

Replace the 
wastegate control 
solenoid valve.  
<Ref. to 
IN(H4DOSTC)-21, 
Wastegate Con-
trol Solenoid 
Valve.>

EN(H4DOSTC)-120

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

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

(F81) No. 2 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 6.

Repair the open 
circuit in harness 
between main 
relay and waste-
gate control sole-
noid valve 
connector.

6

CHECK POOR CONTACT.
Check poor contact in wastegate control sole-
noid valve connector.
Is there poor contact in wastegate control sole-
noid valve connector?

There is poor contact.

Repair the poor 
contact in waste-
gate control sole-
noid valve 
connector.

Contact with your 
Subaru distributor.

NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.

Step

Value

Yes

No

EN(H4DOSTC)-121

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO: