Subaru Legacy III (2000-2003 year). Manual - part 369

EN(H6DO)-278

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BS:DTC P0662 — INTAKE MANIFOLD TUNING VALVE CONTROL CIRCUIT 

HIGH - BANK 1 —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

• TROUBLE SYMPTOM:

• Erroneous idling

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-01097

23

B20

E1

1

2

7

4

E30

SBF-5

B137

B20

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

E30

B47

3

4

1

2

5

6

BATTERY

B137

ECM

B47

MAIN RELAY

INDUCTION VALVE
CONTROL SOLENOID

1

2

3

5

4

6

1 2

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

F46

3 4

1 2

B108

F46

2

RHD

LHD

LHD

RHD

EN(H6DO)-279

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK INPUT SIGNAL OF ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-

sis ground.

Connector & terminal

(B137) No. 23 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 3.

Go to step 2.

2

CHECK POOR CONTACT.
Check poor contact in ECM connector. 
Is there poor contact in ECM connector?

There is poor contact.

Repair poor con-
tact in ECM con-
nector.

Replace ECM. 
<Ref. to 
FU(H6DO)-46, 
Engine Control 
Module.>

3

CHECK HARNESS BETWEEN INDUCTION 
CONTROL SOLENOID VALVE AND ECM 
CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from induction con-

trol solenoid valve.

3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-

sis ground.

Connector & terminal

(B137) No. 23 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Repair battery 
short circuit in har-
ness between 
ECM and induc-
tion control sole-
noid valve 
connector. After 
repair, replace 
ECM. <Ref. to 
FU(H6DO)-46, 
Engine Control 
Module.>

Go to step 4.

4

CHECK INDUCTION CONTROL SOLENOID 
VALVE.
1) Turn ignition switch to OFF.
2) Measure resistance between induction con-

trol solenoid valve terminals.

Terminals

No. 1 — No. 2:

Is the measured value less than the speci-
fied value?

1 

Ω

Replace induction 
control solenoid 
valve <Ref. to 
FU(H6DO)-38, 
Induction Valve 
Control Sole-
noid.> and ECM 
<Ref. to 
FU(H6DO)-46, 
Engine Control 
Module.>

Go to step 5.

5

CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?

There is poor contact.

Repair poor con-
tact in ECM con-
nector.

Replace ECM. 
<Ref. to 
FU(H6DO)-46, 
Engine Control 
Module.>

EN(H6DO)-280

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BT:DTC P0691 — COOLING FAN 1 CONTROL CIRCUIT LOW —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

• TROUBLE SYMPTOM:

• Radiator fan does not operate properly.
• Overheating

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.>.

EN(H6DO)-281

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

• WIRING DIAGRAM:

CO-00167

2

1

4

3

28

27

25

29

8

7

5

9

31

32

34

30

21

22

24

20

30A

30A

SUB FAN

RELAY-1

AIR CONDITIONING RELAY HOLDER

SUB FAN

MOTOR

MAIN FAN

MOTOR

MAIN FAN

RELAY-1

F28

F16

F66

SUB FAN

RELAY-2

MAIN FAN

RELAY-2

F29

F30

F27

F17

B100

F2

B72

NO. 18

NO. 17

SBF-4

SBF-1

IGNITION 
SWITCH

RELAY HOLDER (BLACK)

B72

F16

B253

F17

F46

3 4

1 2

B137

BATTERY

17

24

28

B137

ENG

IN

E C

O

NTR

O

L

M

O

DULE

B253

FAN RELAY

5
1
3
4

3

3

4

4

1

1

2

2

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

1

3

4

5

2

1

F46

B108

1

F44

B61

LHD

LHD

RHD

RHD

1

*

2

*

1

*

2

*

LHD : 7

LHD : 6

RHD : 5

RHD : 6

1 2 3 4
5 6 7 8

F44

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

1

2

5 6

8
9

7

3

4

25 26 27

28
29

30
31

32 33 34

10
11

12 13 14

15 16 17

18
19

20
21

22 23 24

35

36

F30

F28

F29

F66

F27