Subaru Legacy (2005 year). Service manual — part 437
EN(H6DO)(diag)-61
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
2
CHECK IGNITION SYSTEM FOR SPARKS.
1) Connect the spark plug to ignition coil.
2) Release the fuel pressure.
3) Contact the spark plug’s thread portion on
engine.
4) While opening the throttle valve fully, start
the engine to check if spark occurs at each cyl-
inder.
Does spark occur at each cyl-
inder?
Check fuel pump
system. <Ref. to
EN(H6DO)(diag)-
62, FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
3
CHECK POWER SUPPLY CIRCUIT OF IGNI-
TION COIL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition coil.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
ignition coil connector and engine ground.
Connector & terminal
(E31) No. 3 (+) — Engine ground (
−
):
(E32) No. 3 (+) — Engine ground (
−
):
(E33) No. 3 (+) — Engine ground (
−
):
(E34) No. 3 (+) — Engine ground (
−
):
(E45) No. 3 (+) — Engine ground (
−
):
(E46) No. 3 (+) — 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
ignition coil and
ignition switch con-
nector
• Poor contact in
coupling connector
4
CHECK HARNESS OF IGNITION COIL
GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ignition
coil connector and engine ground.
Connector & terminal
(E31) No. 2 — Engine ground:
(E32) No. 2 — Engine ground:
(E33) No. 2 — Engine ground:
(E34) No. 2 — Engine ground:
(E45) No. 2 — Engine ground:
(E46) No. 2 — Engine ground:
Is the resistance less than 5
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ignition coil con-
nector and engine
ground terminal
5
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from ignition coil.
4) Measure the resistance of harness
between ECM and ignition coil connector.
Connector & terminal
(B135) No. 18 — (E31) No. 1:
(B135) No. 17 — (E32) No. 1:
(B135) No. 16 — (E33) No. 1:
(B135) No. 15 — (E34) No. 1:
(B135) No. 14 — (E45) No. 1:
(B135) No. 13 — (E46) No. 1:
Is the resistance less than 1
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and ignition
coil connector
• Poor contact in
coupling connector
6
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal:
(B135) No. 18 — Engine ground:
(B135) No. 17 — Engine ground:
(B135) No. 16 — Engine ground:
(B135) No. 15 — Engine ground:
(B135) No. 14 — Engine ground:
(B135) No. 13 — Engine ground:
Is the resistance more than 1
M
Ω?
Repair the ground
short circuit of har-
ness between
ECM and ignition
coil connector.
Step
Check
Yes
No
EN(H6DO)(diag)-62
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)(diag)-41,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
7
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
pump circuit. <Ref.
to
EN(H6DO)(diag)-
62, FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
Step
Check
Yes
No
EN-03492
E
E
M
10
7
6
5
6
No.11
B362
R122
B135
B:
B137
D:
R58
7
D28
B27
1
2
9
8
5
FUEL PUMP
CONTROL UNIT
FUEL
PUMP
ECM
BATTERY
FUEL PUMP
RELAY
R58
2
5
4
6
1
3
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
29 30 31
32 33
34 35
B137
D:
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
R122
3 4
1 2
5
8 9 10
6 7
B98
1
2 3
4 5 6 7 8
B362
5
6
7 8
3
4
1 2
B97
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
*
LHD: 16
RHD: 4
1
*
LHD: B97
RHD: B98
2
*
3
*
2
*
5
*
4
*
1
*
2
*
3
*
LHD: R1
RHD: R2
3
*
LHD: 6
RHD: 5
4
*
LHD: 15
RHD: 6
5
EN(H6DO)(diag)-63
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
Step
Check
Yes
No
1
CHECK OPERATING SOUND OF FUEL
PUMP.
Make sure that the fuel pump operates for two
seconds when turning the ignition switch to
ON.
NOTE:
Fuel pump operation can also be executed us-
ing Subaru Select Monitor.
Refer to “Compulsory Valve Operation Check
Mode” for procedures. <Ref. to
EN(H6DO)(diag)-42, Compulsory Valve Oper-
ation Check Mode.>
Does the fuel pump emit oper-
ating sound?
Check the fuel
injector circuit.
<Ref. to
EN(H6DO)(diag)-
64, FUEL INJEC-
TOR CIRCUIT,
Diagnostics for
Engine Starting
Failure.>
Display DTC.
<Ref. to
EN(H6DO)(diag)-
33, OPERATION,
Read Diagnostic
Trouble Code
(DTC).>
EN(H6DO)(diag)-64
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(H6DO)(diag)-
41, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)(diag)-34, PROCE-
DURE, Inspection Mode.>.
WIRING DIAGRAM:
Step
Check
Yes
No
1
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(H6DO)-27,
INSPECTION,
Fuel Pressure.>
E6
E17
E5
E16
E43
E44
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
1
2
1
2
2
1
46
47
E43
E44
FUEL INJECTOR
No. 5
FUEL INJECTOR
No. 6
SBF-7
B47
MAIN RELAY
B47
3
4
1
2
5
6
B136
1 2
EN-03493
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
E
6
4
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