Subaru Legacy (2005 year). Service manual — part 475

EN(H6DO)(diag)-213

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BX:DTC P0605 INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM)

ERROR

NOTE:
For the diagnostic procedure, refer to DTC P0607. <Ref. to EN(H6DO)(diag)-214, DTC P0607 CONTROL
MODULE PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

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

Temporary poor
contact occurs.

EN(H6DO)(diag)-214

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BY:DTC P0607 CONTROL MODULE PERFORMANCE

DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:

EN-03504

BATTERY

IGNITION
SWITCH

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

B72

B6

B5

D16

B19

D14

No.12

B47

E2

B21

E

3

6

3

4

1

2

5

6

B47

No.13

B134

5

6

7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 34

29

32

30 31

B135

5

6

7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26 27

28

16 17 18 19

20 21

29 30 31

32 33

34 35

B137

5

6

7

8

2

1

9

4

3

10

22 23

11 12 13 14 15

24 25

26

16 17

18 19 20 21

27

28 29

30 31

B21

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

B72

1

3

4 5 6

2

A:

B:

D:

SBF-5

*

1

1
2

3

4

5

6

E57

1 2 3 4 5 6

B20

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

14

13

15 16

B122

3 4

5 6

1 2

7 8

B83

B138

E57

E1

B20

B122

B83

A6

D2

A7

B12

D3

D7

D1

ECM

B134

B135

A:

D: B137

B:

B4

*

*

B1

A4

A5

E

52

37

36

34

12

35

20

39

38

19

C16

D4

D5

C35

5

1

2

3

4

6

C29

C18

54

15

16

ELECTRONIC
THROTTLE CONTROL

1
1

E

RHD

RHD

LHD

*

*

B138

1
1

: TERMINAL No.
RANDOM
ARRANGEMEN

T

TO OXYGEN SENSOR

*

: TERMINAL No.
RANDOM
ARRANGEMENT
AMONG 3,4,7,
AND 8

2

*

2

*

2

B122 : LHD

: RHD

EN(H6DO)(diag)-215

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BZ:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE

(BANK 1)

NOTE:
For diagnostic procedure, refer to DTC P2101. <Ref. to EN(H6DO)(diag)-239, DTC P2101 THROTTLE AC-
TUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.

Connector & terminal

(B135) No. 5 (+) — Chassis ground (

−

):

(B135) No. 6 (+) — Chassis ground (

−

):

Is the voltage 10 — 13 V?

Go to step 2.

Repair the open or
ground short cir-
cuit of power sup-
ply circuit.

2

CHECK INPUT VOLTAGE OF ECM.
1) Start the engine.
2) Measure the voltage between ECM con-
nector and chassis ground.

Connector & terminal

(B135) No. 5 (+) — Chassis ground (

−

):

(B135) No. 6 (+) — Chassis ground (

−

):

Is the voltage 13 — 15 V?

Go to step 3.

Repair the open or
ground short cir-
cuit of power sup-
ply circuit.

3

CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance of harness
between ECM and electronic throttle control
connector.

Connector & terminal

(E57) No. 5 — (B136) No. 16:
(E57) No. 3 — (B136) No. 35:

Is the resistance less than 1
Ω?

Go to step 4.

Repair the open
circuit of harness
between ECM and
electronic throttle
relay.

4

CHECK ECM GROUND HARNESS.
Measure the voltage between ECM connector
and chassis ground.

Connector & terminal

(B137) No. 1 (+) — Chassis ground (

−

):

(B137) No. 2 (+) — Chassis ground (

−

):

(B137) No. 3 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H6DO)-34,
Engine Control
Module (ECM).>

Further tighten the
engine ground ter-
minal.

EN(H6DO)(diag)-216

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CA:DTC P0691 FAN 1 CONTROL CIRCUIT LOW

DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
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)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.

CB:DTC P0692 FAN 1 CONTROL CIRCUIT HIGH

DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
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)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.

CC:DTC P0700 TRANSMISSION CONTROL SYSTEM (MIL REQUEST)

NOTE:
For the diagnostic procedure, refer to AT section. <Ref. to 4AT(diag)-2, Basic Diagnostic Procedure.>

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is DTC P0691 displayed?

Check the radiator
fan system. <Ref.
to CO(H6DO)-8,
Radiator Fan Sys-
tem.>

Temporary poor
contact occurs.

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is DTC 692 displayed?

Check the radiator
fan system. <Ref.
to CO(H6DO)-8,
Radiator Fan Sys-
tem.>

Temporary poor
contact occurs.