Subaru Legacy III (2000-2003 year). Manual — part 320

EN(H6DO)-82

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

5

CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Disconnect connector from ignition coil &

ignitor assembly.

4) Measure resistance of harness between

ECM and ignition coil & ignitor assembly
connector.

Connector & terminal

(B136) No. 24 — (E31) No. 1:
(B136) No. 23 — (E32) No. 1:
(B136) No. 22 — (E33) No. 1:
(B136) No. 21 — (E34) No. 1:
(B136) No. 20 — (E45) No. 1:
(B136) No. 19 — (E46) No. 1:

Is the measured value less than the speci-
fied value?

1

Ω

Go to step 6.

Repair harness
and connector.

NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
coupling connector

6

CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
Measure resistance of harness between ECM
and engine ground.

Connector & terminal:

(B136) No. 24 — Engine ground:
(B136) No. 23 — Engine ground:
(B136) No. 22 — Engine ground:
(B136) No. 21 — Engine ground:
(B136) No. 20 — Engine ground:
(B136) No. 19 — Engine ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 7.

Repair ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor
assembly connec-
tor.

7

CHECK INPUT SIGNAL FOR IGNITION COIL
& IGNITOR ASSEMBLY.
1) Connect connector to ignition coil & ignitor

assembly.

2) Check if voltage varies synchronously with

engine speed when cranking, while moni-
toring voltage between ignition coil & ignitor
assembly connector and engine ground.

Connector & terminal

(E31) No. 1 (+) — Engine ground (–):
(E32) No. 1 (+) — Engine ground (–):
(E33) No. 1 (+) — Engine ground (–):
(E34) No. 1 (+) — Engine ground (–):
(E45) No. 1 (+) — Engine ground (–):
(E46) No. 1 (+) — Engine ground (–):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 8.

Replace ignition
coil & ignitor
assembly. <Ref. to
IG(H6DO)-7, Igni-
tion Coil and Igni-
tor Assembly.>

8

CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?

There is poor contact.

Repair poor con-
tact in ECM con-
nector.

Check fuel pump
circuit. <Ref. to
EN(H6DO)-84,
FUEL PUMP CIR-
CUIT, Diagnostics
for Engine Start-
ing Failure.>

Step

Value

Yes

No

EN(H6DO)-83

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

MEMO:

EN(H6DO)-84

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

E: FUEL PUMP CIRCUIT

CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(H6DO)-54,
OPERATION, Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(H6DO)-47, OPERATION, In-
spection Mode.>.
• WIRING DIAGRAM:
• LHD model

EN-01084

10

R57

R58

R15

9

BATTERY

FUEL PUMP
CONTROLLER

FUEL
PUMP

FUEL PUMP
RELAY

SBF-5

F44

B61

B97

B46

R1

6

3

R3

B99

2

4

R122

7

B136

C:

3

5

4

24

25

8

6

5

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

F44

B97

1 2 3 4
5 6 7 8

C16

ECM

B136

B12

C:

B135

B:

B135

B:

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

2

1

B46

3 4

1 2

R122

1 2

3 4

5 6 7 8 9 10

R57

1

2

3 4 5 6

R58

1 2
3 4
5 6

NO. 13

B99

21

9

32

1 2 3 4

5 6

10 11 12 13 14 15

7

16

23

30

19 20

22

26 27 28 29

8

17

24

31

18

25

EN(H6DO)-85

ENGINE (DIAGNOSTICS)

DIAGNOSTICS FOR ENGINE STARTING FAILURE

• RHD model

Step

Value

Yes

No

1

CHECK OPERATING SOUND OF FUEL
PUMP.
Make sure that the fuel pump is in operation for
2 seconds when turning ignition switch to ON.

NOTE:

Fuel pump operation check can also be execut-
ed using Subaru Select Monitor.
For the procedure, refer to “Compulsory Valve
Operation Check Mode”. <Ref. to EN(H6DO)-
55, Compulsory Valve Operation Check
Mode.>
Does the fuel pump produce operating sound?

Operating sound produced.

Check fuel injec-
tor circuit. <Ref. to
EN(H6DO)-86,
FUEL INJECTOR
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>

Read the diagnos-
tic Trouble Code
(DTC) and check
related DTC. <Ref.
to EN(H6DO)-89,
List of Diagnostic
Trouble Code
(DTC).>

EN-01085

10

R57

R58

R15

9

BATTERY

FUEL PUMP
CONTROLLER

FUEL
PUMP

FUEL PUMP
RELAY

SBF-5

B99

B46

R3

1

R2

B98

2

4

R122

7

B136

C:

3

5

4

14

16

8

6

5

1 2

7

8 9

5

6

3

4

10 11 12
19 20 21

13 14 15 16

17 18

22 23 24

C16

ECM

B136

B12

C:

B135

B:

B135

B:

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

2

1

B46

3 4

1 2

R122

1 2

3 4

5 6 7 8 9 10

R57

1

2

3 4 5 6

R58

1 2
3 4
5 6

NO. 13

R2

2 3 4 5

6 7 8 9

11 12 13 14

17 18 19 20

10

1

15 16