Subaru Legacy (2005 year). Service manual — part 143

EN(H4SO 2.0)(diag)-161

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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

ERROR

NOTE:
For the diagnostic procedure, refer to DTC P0607. <Ref. to EN(H4SO 2.0)(diag)-162, DTC P0607 CON-
TROL 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(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

EN(H4SO 2.0)(diag)-162

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AU: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, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:

EN-03509

BATTERY

IGNITION
SWITCH

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

B72

C4

C3

B14

B5

C6

B6

C1

C2

A7

C5

C7

B13

No.12

B47

2

1

4

6

5

3

E

E

3

6

D1

36

3

4

1

2

5

6

B47

No.13

A2

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

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

A:

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

B:

D:

ECM

B134

B135

A:

D: B137

B:

B136

C:

B136

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

35

C:

52

37

34

35

E78

E1

B20

20

39

38

19

5

2

15

16

ELECTRONIC
THROTTLE CONTROL

E

1

1

B83

:LHD

B138 :RHD

*
*

2

2

B83

:LHD

B138 :RHD

*
*

4

*

6

*

3

*

5

*

D2

D3

D4

D5

C18

C30

C17

D24

D23

E2

B21

SBF-5

*

1

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

*

2

: TERMINAL No.
RANDOM
ARRANGEMENT
AMONG 1,2,5, AND 6

*

3

LHD : 4
RHD : 6

*

4

LHD : 6
RHD : 4

*

5

LHD : 3
RHD : 1

*

6

LHD : 1
RHD : 3

E78

1 2 3 4
5 6 7 8

B83

B138

B20

TO OXYGEN SENSOR

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

14

13

15 16

EN(H4SO 2.0)(diag)-163

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AV:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE

(BANK 1)

NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO 2.0)(diag)-190, DTC P2101 THROT-
TLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Di-
agnostic 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

(B136) No. 3 (+) — Chassis ground (

−

):

(B136) No. 4 (+) — 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

(B136) No. 3 (+) — Chassis ground (

−

):

(B136) No. 4 (+) — 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
LHD model

(B135) No. 4 — (E24) No. 17:
(E78) No. 1 — (B136) No. 18:

RHD model

(E78) No. 6 — (B136) No. 17:
(E78) No. 3 — (B136) No. 18:

Is the resistance less than 1
Ω?

Go to step 4.

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

4

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

Connector & terminal

(B136) No. 2 (+) — Chassis ground (

−

):

(B136) No. 5 (+) — Chassis ground (

−

):

(B136) No. 6 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.0)-
34, Engine Con-
trol Module
(ECM).>

Further tighten the
engine ground ter-
minal.

EN(H4SO 2.0)(diag)-164

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AW: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, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.

AX: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, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.

AY: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 on the
Subaru Select Monitor?

Check the radiator
fan system. <Ref.
to CO(H4SO 2.0)-
7, Radiator Fan
System.>

Temporary poor
contact occurs.

Step

Check

Yes

No

1

CHECK ANY OTHER DTC ON DISPLAY.

Is DTC P0692 displayed on the
Subaru Select Monitor?

Check the radiator
fan system. <Ref.
to CO(H4SO 2.0)-
7, Radiator Fan
System.>

Temporary poor
contact occurs.