Subaru Legacy III (2000-2003 year). Manual — part 366

EN(H6DO)-266

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BM:DTC P0519 — IDLE AIR CONTROL CIRCUIT SYSTEM PERFORMACE —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

• TROUBLE SYMPTOM:

• Engine does not return to normal idle speed.

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:

EN-01094

C17

C10

A22

B20

E1

ECM

2

3

1

9

3

IDLE

AIR CONTROL

SOLENOID

VALVE

E7

B20

E1

B47

B134

A:

B136

C:

B47

3

4

1

2

5

6

B134

B20

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

E7

B136

SBF-5

BATTERY

MAIN RELAY

1

2

3

5

4

6

4

F46

3 4

1 2

1 2 3

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

2

B108

F46

RHD

LHD

LHD

RHD

EN(H6DO)-267

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

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

Another DTC is displayed.

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>

NOTE:
In this case, it is
not necessary to
inspect DTC
P1507.

Go to step 2.

2

CHECK THROTTLE CABLE.
Does throttle cable have play for adjustment?

Throttle cable has a play.

Go to step 3.

Adjust throttle
cable. <Ref. to
SP(H6DO)-8,
Accelerator Con-
trol Cable.>

3

CHECK AIR INTAKE SYSTEM.
1) Turn ignition switch to ON.
2) Start engine, and idle it.
3) Check the following items.
• Loose installation of intake manifold, idle air
control solenoid valve and throttle body
• Cracks of intake manifold gasket, idle air con-
trol solenoid valve gasket and throttle body
gasket
• Disconnections of vacuum hoses

Is there a fault in air intake system?

There is a fault.

Repair air suction
and leaks.

Replace idle air
control solenoid
valve. <Ref. to
FU(H6DO)-36, Idle
Air Control Sole-
noid Valve.>

EN(H6DO)-268

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BN:DTC P0558 — ALTERNATOR CIRCUIT LOW INPUT —

NOTE:
For the diagnostic procedure, refer to DTC P0559. <Ref. to EN(H6DO)-268, DTC P0559 — ALTERNATOR
CIRCUIT HIGH INPUT —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

BO:DTC P0559 — ALTERNATOR CIRCUIT HIGH INPUT —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:

EN-01095

B100

F2

F26

3

1 2 3

12

ECM

B137

F26

GENERATOR

B137

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

F2

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5 6

7

*

*

LHD : 23

RHD : 16

EN(H6DO)-269

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK HARNESS BETWEEN GENERATOR
AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect the connectors from generator

and ECM.

3) Measure the resistance of harness

between generator connector and engine
ground.

Connector & terminal

(F26) No. 3 — Engine ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 2.

Repair the short
circuit in harness
between ECM and
generator connec-
tor.

2

CHECK HARNESS BETWEEN GENERATOR
AND ECM CONNECTOR.
Measure the resistance of harness between
ECM and generator of harness connector.

Connector & terminal

(B137) No. 12 — (F26) No. 3:

Is the measured value less than the specified
value?

1

Ω

Repair poor con-
tact in connector.

Repair the open
circuit in harness
between ECM and
generator connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and genera-
tor connector
• Poor contact in
coupling connector