Subaru Legacy III (2000-2003 year). Service 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.
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
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
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
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
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:
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