Subaru Legacy (2005 year). Manual - part 229

EN(H4SO 2.5)(diag)-201

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic 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 OPERATION OF STARTER MOTOR.
Turn the ignition switch to START.

NOTE:

• For AT model, set the selector lever in the 
“P” or “N” range.
• For MT model, depress the clutch pedal.

Does the starter motor oper-
ate?

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open or ground 
short circuit of har-
ness between 
ECM and starter 
motor connector
• Poor contact in 
ECM connector

Check the starter 
motor circuit. <Ref. 
to EN(H4SO 
2.5)(diag)-54, 
STARTER 
MOTOR CIRCUIT, 
Diagnostics for 
Engine Starting 
Failure.>

EN(H4SO 2.5)(diag)-202

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BO:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
Immediately at fault recognition

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-03511

SBF-6

MAIN SBF

SBF-7

B72

B6

B5

A6

D2

A7

B12

D3

D7

D1

B19

No.12

B47

E2

B21

6

5

E

E

3

6

B134

B135

A:

D: B137

B:

B4

52

37

36

34

47

3

4

1

2

5

6

B47

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
2

1

*

2

*

4

3

ECM

1

*

2

*

MAIN RELAY

TO IGNITION COIL

IGNITION
SWITCH

BATTERY

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

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

EN(H4SO 2.5)(diag)-203

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic 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 SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and 
chassis ground.

Connector & terminal

(B135) No. 19 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Repair the poor 

contact in ECM 
connector.

Go to step 3.

3

CHECK HARNESS BETWEEN ECM AND 
MAIN FUSE BOX CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness 
between ECM and chassis ground.

Connector & terminal

(B135) No. 19 — Chassis ground:

Is the resistance less than 10 
Ω?

Repair the ground 
short circuit of har-
ness between 
ECM connector 
and battery termi-
nal.

Go to step 4.

4

CHECK FUSE No. 13.

Is the fuse blown out?

Replace the fuse.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
ECM and battery
• Poor contact in 
ECM connector
• Poor contact in 
battery terminal

EN(H4SO 2.5)(diag)-204

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BP:DTC P2004 INTAKE MANIFOLD RUNNER CONTROL STUCK OPEN (BANK 

1)

DTC DETECTING CONDITION:
Immediately at fault recognition

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.>.

BQ:DTC P2005 INTAKE MANIFOLD RUNNER CONTROL STUCK OPEN (BANK 

2)

DTC DETECTING CONDITION:
Immediately at fault recognition

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 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 
2.5)(diag)-69, List 
of Diagnostic Trou-
ble Code (DTC).>

Go to step 2.

2

CHECK TUMBLE GENERATOR VALVE RH.
1) Remove the tumble generator valve assem-
bly.
2) Check the tumble generator valve body.

Does the tumble generator 
valve move smoothly? (No dirt, 
no foreign material clogged)

Replace the tum-
ble generator valve 
assembly. <Ref. to 
FU(H4SO 2.5)-28, 
Tumble Generator 
Valve Assembly.>

Clean tumble gen-
erator valve.

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 
2.5)(diag)-69, List 
of Diagnostic Trou-
ble Code (DTC).>

Go to step 2.

2

CHECK TUMBLE GENERATOR VALVE LH.
1) Remove the tumble generator valve assem-
bly.
2) Check the tumble generator valve body.

Does the tumble generator 
valve move smoothly? (No dirt, 
no foreign material clogged)

Replace the tum-
ble generator valve 
assembly. <Ref. to 
FU(H4SO 2.5)-28, 
Tumble Generator 
Valve Assembly.>

Clean the tumble 
generator valve.