Subaru Legacy (2005 year). Service manual — part 223

EN(H4SO 2.5)(diag)-177

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AV: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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model

• KA and KS model

NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.

EN-03514

BATTERY

IGNITION
SWITCH

MAIN RELAY

SBF-6

MAIN SBF

SBF-7

B72

B6

B5

A6

D2

A7

B12

D3

D7

D1

B19

No.12

B47

E2

B21

6

5

ECM

E

E

3

6

B134

B135

A:

D: B137

B:

B4

52

37

36

34

47

3

4

1

2

5

6

B47

TO IGNITION COIL

No.13

B1

35

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:

1

*

3

4

1

*

2

*

LHD WITH IMMOBILIZER: D16
LHD WITHOUT IMMOBILIZER: D17
RHD : D16

2

*

LHD WITH IMMOBILIZER: D14
LHD WITHOUT IMMOBILIZER: D15
RHD : D14

3

*

4

*

: TERMINAL No.
RANDOM ARRANGEMENT

E57

E1

B20

B83

*

*

20

39

38

19

C16

D4

D5

C35

5

1

2

3

4

6

C29

C18

15

16

ELECTRONIC
THROTTLE CONTROL

3
3

E

3

3

B122 :LHD

B138 :RHD

*
*

B21

E2

E

36

B122 :RHD

B138 :LHD

B20

E57

B122

B83

B138

1 2 3 4
5 6 7 8

1

2

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

7

32 33 34 35

B136

C:

1 2 3 4 5 6

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

14

13

15 16

4

*

4

*

1
2

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

EN(H4SO 2.5)(diag)-178

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AW:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE

(BANK 1)

NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO 2.5)(diag)-224, DTC P2101 THROT-
TLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Di-
agnostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH,
ER or K4?

Go to step 2.

Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

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 3.

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

3

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 4.

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

4

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 5.

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

5

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

Connector & terminal

(B135) No. 1 (+) — Chassis ground (

−

):

(B135) No. 4 (+) — Chassis ground (

−

):

(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(H4SO 2.5)-
37, Engine Con-
trol Module
(ECM).>

Further tighten the
engine ground ter-
minal.

EN(H4SO 2.5)(diag)-179

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AX: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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.

Step

Check

Yes

No

1

CHECK OPTION CODE.

Is the option code EC, EK, EH,
ER or K4?

Go to step 2.

Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

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.

EN(H4SO 2.5)(diag)-180

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AY: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(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.

AZ: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 OPTION CODE.

Is the option code EC, EK, EH,
ER or K4?

Go to step 2.

Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>

NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.

2

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.