Subaru Legacy (2005 year). Service manual - part 115

EN(H4SO 2.0)(diag)-49

ENGINE (DIAGNOSTICS)

Malfunction Indicator Light

2

CHECK HARNESS BETWEEN ECM CON-
NECTOR AND CHASSIS GROUND TERMI-
NAL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance of harness 
between ECM connector and chassis ground.

Connector & terminal

(B135) No. 24 — Chassis ground:

Is the resistance less than 5 
Ω?

Repair the short 
circuit of harness 
between ECM and 
test mode connec-
tor.

Replace the ECM. 
<Ref. to FU(H4SO 
2.0)-34, Engine 
Control Module 
(ECM).>

Step

Check

Yes

No

EN(H4SO 2.0)(diag)-50

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

16.Diagnostics for Engine Starting Failure

A: PROCEDURE

1. Check for fuel amount.

↓

2. Inspection of starter motor circuit. <Ref. to EN(H4SO 2.0)(diag)-51, STARTER MOTOR CIRCUIT, Diagnostics for Engine Start-
ing Failure.>

↓

3. Inspection of ECM power supply and ground line. <Ref. to EN(H4SO 2.0)(diag)-54, CHECK POWER SUPPLY AND GROUND 
LINE OF ENGINE CONTROL MODULE (ECM), Diagnostics for Engine Starting Failure.>

↓

4. Inspection of ignition control system. <Ref. to EN(H4SO 2.0)(diag)-56, IGNITION CONTROL SYSTEM, Diagnostics for Engine 
Starting Failure.>

↓

5. Inspection of fuel pump circuit. <Ref. to EN(H4SO 2.0)(diag)-59, FUEL PUMP CIRCUIT, Diagnostics for Engine Starting Fail-
ure.>

↓

6. Inspection of fuel injector circuit. <Ref. to EN(H4SO 2.0)(diag)-62, FUEL INJECTOR CIRCUIT, Diagnostics for Engine Starting 
Failure.>

EN(H4SO 2.0)(diag)-51

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

B: STARTER MOTOR CIRCUIT

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-03471

B225

10

11 12

13
14

15 16

17
18

19 20

21
22

23 24

25
26

27 28

29

30

31 32

33
34

35 36

39 40

37
38

1

2

9

3

4

5

6

7

8

B12

1 2 3 4
5 6 7 8
9 10 11 12

B25

1 2

1 2 3 4
5 6 7 8

B83

B122

T7

1 2 3 4 5 6
7 8 9 10 11 12

B135

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

32 33

34 35

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

23

ECM

B135

B14

M

STARTER MOTOR

E

12

12

B12

T3

T7

P

N

7

11

AT

AT

MT

MT

No.21

MAIN SBF

SBF-6

E

B72

2

3

BATTERY

IGNITION
SWITCH

B225

16

14

16

14

STARTER
RELAY

15

13

15

13

LHD

RHD

LHD

RHD

MT

12

B21

E2

E

36

NEUTRAL
POSITION
SWITCH

1

B25

T2

T2

B25

2

*

B83

B122 : LHD

: RHD

JOINT
CONNECTOR

*

B21

E2

35

*

: TERMINAL No. RANDOM
  ARRANGEMENT

EN(H4SO 2.0)(diag)-52

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

Step

Check

Yes

No

1

CHECK BATTERY.
Check the battery voltage.

Is the voltage more than 12 V? Go to step 2.

Charge or replace 
the battery.

2

CHECK OPERATION OF STARTER MOTOR. Does the starter motor oper-

ate?

Go to step 3.

Go to step 4.

3

CHECK DTC.

Is DTC displayed? <Ref. to 
EN(H4SO 2.0)(diag)-31, 
OPERATION, Read Diagnos-
tic Trouble Code (DTC).>

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).>

Repair the poor 
contact in ECM 
connector.

4

CHECK INPUT SIGNAL OF STARTER MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter 
motor.
3) Turn the ignition switch to START.
4) Measure the power supply voltage between 
starter motor connector terminal and engine 
ground.

Connector & terminal

(B14) No. 1 (+) — Engine ground (

−

):

NOTE:

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

Is the voltage more than 10 V? Check the starter 

motor. <Ref. to 
SC(H4SO 2.0)-6, 
Starter.>

Go to step 5.

5

CHECK HARNESS BETWEEN BATTERY 
AND IGNITION SWITCH CONNECTOR.
1) Disconnect the connector from ignition 
switch.
2) Measure the power supply voltage between 
ignition switch connector and chassis ground.

Connector & terminal

(B72) No. 3 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 6.

Repair the open 
circuit of harness 
between ignition 
switch and bat-
tery, and check 
fuse SBF No. 6 
and MAIN SBF.

6

CHECK IGNITION SWITCH.
1) Disconnect the connector from ignition 
switch.
2) Measure the resistance between ignition 
switch terminals after turning the ignition 
switch to START position.

Terminals

No. 2 — No. 3:

Is the resistance less than 5 
Ω?

Go to step 7.

Replace the igni-
tion switch.

7

CHECK INPUT VOLTAGE OF STARTER RE-
LAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter relay.
3) Connect the connector to ignition switch.
4) Measure the input voltage between starter 
relay connector and chassis ground after turn-
ing the ignition switch to START position.

Connector & terminal
LHD model

(B225) No. 13 (+) — Chassis ground (

−

):

(B225) No. 15 (+) — Chassis ground (

−

):

RHD model

(B225) No. 14 (+) — Chassis ground (

−

):

(B225) No. 16 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 8.

Repair the open 
circuit of harness 
between starter 
relay and ignition 
switch.