Subaru Legacy (2005 year). Service manual - part 195

EN(H4SO 2.5)(diag)-65

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

7

CHECK FUEL PUMP RELAY.
1) Disconnect the connectors from fuel pump 
relay and main relay.
2) Remove the fuel pump relay and main relay 
with bracket.
3) Connect the battery to fuel pump relay con-
nector terminals No. 3 and No. 4.
4) Measure the resistance between connector 
terminals of fuel pump relay.

Terminals

No. 2 — No. 1:

Is the resistance less than 10 
Ω?

Go to step 8.

Replace the fuel 
pump relay. <Ref. 
to FU(H4SO 2.5)-
50, Fuel Pump.>

8

CHECK HARNESS BETWEEN ECM AND 
FUEL PUMP RELAY CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness 
between ECM and fuel pump relay connector.

Connector & terminal

RHD model

(B135) No. 27 — (B362) No. 3:

LHD model with immobilizer

(B135) No. 27 — (B362) No. 3:

LHD model without immobilizer

(B135) No. 26 — (B362) No. 3:

Is the resistance less than 1 
Ω?

Go to step 9.

Repair the open 
circuit of harness 
between ECM and 
fuel pump relay 
connector.

9

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM 
connector?

Repair the poor 
contact in ECM 
connector.

Check the fuel 
injector circuit. 
<Ref. to EN(H4SO 
2.5)(diag)-66, 
FUEL INJECTOR 
CIRCUIT, Diag-
nostics for Engine 
Starting Failure.>

Step

Check

Yes

No

EN(H4SO 2.5)(diag)-66

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

F: FUEL INJECTOR CIRCUIT

CAUTION:
• Check or repair only faulty parts.
• After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(di-
ag)-40, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33,
PROCEDURE, 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-03456

E6

E17

E5

E16

1 2

1

2

1

2

1

2

1

2

4

5

6

3

42

48

43

44

45

ECM

B136

E5

E16

E6

E17

B21

E2

FUEL INJECTOR

No. 1

FUEL INJECTOR

No. 2

FUEL INJECTOR

No. 3

FUEL INJECTOR

No. 4

BATTERY

SBF-7

B47

MAIN RELAY

1

2

6

3

5

B47

3

4

1

2

5

6

E

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

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

4

EN(H4SO 2.5)(diag)-67

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

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 EACH FUEL INJEC-
TOR.
While cranking the engine, check each fuel 
injector emits operating sound. Use a sound 
scope or attach a screwdriver to the injector for 
this check.

Does the fuel pump emit oper-
ating sound?

Check the fuel 
pressure. <Ref. to 
ME(H4SO 2.0)-27, 
INSPECTION, 
Fuel Pressure.>

Go to step 3.

3

CHECK POWER SUPPLY TO EACH FUEL 
INJECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between 
fuel injector terminal and engine ground.

Connector & terminal

#1 (E5) No. 2 (+) — Engine ground (

−

):

#2 (E16) No. 2 (+) — Engine ground (

−

):

#3 (E6) No. 2 (+) — Engine ground (

−

):

#4 (E17) No. 2 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 4.

Repair the har-
ness and connec-
tor.

NOTE:
In this case, repair
the following:
• Open circuit of 
harness between 
main relay and fuel 
injector connector
• Poor contact in 
main relay connec-
tor
• Poor contact in 
coupling connector
• Poor contact in 
fuel injector con-
nector

4

CHECK HARNESS BETWEEN ECM AND 
FUEL INJECTOR CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness 
between ECM and fuel injector connector.

Connector & terminal

#1 (B136) No. 6 — (E5) No. 1:
#2 (B136) No. 5 — (E16) No. 1:
#3 (B136) No. 4 — (E6) No. 1:
#4 (B136) No. 3 — (E17) No. 1:

Is the resistance less than 1 
Ω?

Go to step 5.

Repair the har-
ness and connec-
tor.

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

5

CHECK HARNESS BETWEEN ECM AND 
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between 
ECM and fuel injector connector.

Connector & terminal

#1 (B136) No. 6 — Chassis ground:
#2 (B136) No. 5 — Chassis ground:
#3 (B136) No. 4 — Chassis ground:
#4 (B136) No. 3 — Chassis ground:

Is the resistance more than 1 
M

Ω?

Go to step 6.

Repair the ground 
short circuit of har-
ness between 
ECM and fuel 
injector connector.

EN(H4SO 2.5)(diag)-68

ENGINE (DIAGNOSTICS)

Diagnostics for Engine Starting Failure

6

CHECK EACH FUEL INJECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between each fuel 
injector terminals.

Terminals

No. 1 — No. 2:

Is the resistance 5 — 20 

Ω?

Go to step 7.

Replace the faulty 
fuel injector.

7

CHECK POOR CONTACT.
Check poor contact in ECM connector.

Is there poor contact in ECM 
connector?

Repair the poor 
contact in ECM 
connector.

Inspection using 
“General Diagnos-
tic Table” <Ref. to 
EN(H4SO 
2.5)(diag)-257, 
INSPECTION, 
General Diagnos-
tic Table.>

Step

Check

Yes

No