Subaru Legacy IV (2008 year). Service manual — part 313
EN(H4DOTC)(diag)-73
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
D: IGNITION CONTROL SYSTEM
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-06952
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
SBF-6
MAIN SBF
B72
B137
18
19
20
21
ECM
No. 12
E
1
3
26
E2
B21
E31
E31
E32
E33
E34
E32
E33
E34
6
1
2
3
B21
3
1
2
3
1
2
9
49
20
31
10
41
3
1
2
3
1
2
B137
B72
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
1
3
4 5 6
2
IGNITION
SWITCH
IGNITION COIL
No. 1
IGNITION COIL
No. 3
IGNITION COIL
No. 4
IGNITION COIL
No. 2
BATTERY
EN(H4DOTC)(diag)-74
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK SPARK PLUG CONDITION.
1) Remove the spark plug. <Ref. to
IG(H4DOTC)-4, REMOVAL, Spark Plug.>
2) Check the spark plug condition. <Ref. to
IG(H4DOTC)-5, INSPECTION, Spark Plug.>
Is the spark plug condition nor-
mal?
Go to step 2.
Replace the spark
plug. <Ref. to
IG(H4DOTC)-4,
Spark Plug.>
2
CHECK IGNITION SYSTEM FOR SPARKS.
1) Connect the spark plug to ignition coil.
2) Release the fuel pressure. <Ref. to
FU(H4DOTC)-57, RELEASING OF FUEL
PRESSURE, PROCEDURE, Fuel.>
3) Contact the spark plug’s thread portion to
the engine.
4) While opening the throttle valve fully, crank
the engine to check that spark occurs at each
cylinder.
Does spark occur at each cylin-
der?
Check fuel pump
system. <Ref. to
EN(H4DOTC)(diag)
-76, FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
Go to step 3.
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 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 (–):
Is the voltage 10 V or more?
Go to step 4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open harness
between ignition
coil and ignition
switch connector
• Poor contact of
coupling connector
4
CHECK HARNESS OF IGNITION COIL
GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness 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:
Is the resistance less than 5
:? Go to step 5.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and ignition
coil connector
• Open circuit in
harness between
ECM and engine
ground terminal
• Poor contact of
coupling connector
5
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between
ECM and ignition coil connector.
Connector & terminal
(B137) No. 18 — (E31) No. 1:
(B137) No. 19 — (E32) No. 1:
(B137) No. 20 — (E33) No. 1:
(B137) No. 21 — (E34) No. 1:
Is the resistance less than 1
:? Go to step 6.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and ignition
coil connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-75
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
6
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL CONNECTOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal
(B137) No. 18 — Engine ground:
(B137) No. 19 — Engine ground:
(B137) No. 20 — Engine ground:
(B137) No. 21 — Engine ground:
Is the resistance 1 M
: or
more?
Go to step 7.
Repair the ground
short circuit of har-
ness between
ECM and ignition
coil connector.
7
CHECK POOR CONTACT.
Check for poor contact of the ECM connector.
Is there poor contact in ECM
connector?
Repair the poor
contact of ECM
connector.
Replace the igni-
tion coil. <Ref. to
IG(H4DOTC)-7,
Ignition Coil.>
Step
Check
Yes
No
EN(H4DOTC)(diag)-76
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
E: FUEL PUMP CIRCUIT
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
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 be executed using the
Subaru Select Monitor.
For the procedures, refer to “Compulsory Valve
Operation Check Mode”. <Ref. to
EN(H4DOTC)(diag)-53, Compulsory Valve Op-
eration Check Mode.>
Does the fuel pump emit oper-
ating sound?
Check the fuel
injector circuit.
<Ref. to
EN(H4DOTC)(diag)
-77, FUEL INJEC-
TOR CIRCUIT,
Diagnostics for
Engine Starting
Failure.>
Display the DTC.
<Ref. to
EN(H4DOTC)(diag)
-42, OPERATION,
Read Diagnostic
Trouble Code
(DTC).>
EN-05083
E
E
M
10
7
6
5
6
3
5
No.11
B362
R122
B135
B:
B136
C:
R58
B97
7
B33
C12
1
2
9
8
5
19
8
R1
20
R1
B97
R46
R67
FUEL PUMP
CONTROL UNIT
FUEL
PUMP
ECM
BATTERY
FUEL PUMP
RELAY
B135
B136
B362
R58
2
5
4
6
1
3
B:
C:
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
R122
3 4
1 2
5
8 9 10
6 7
5
6
7 8
3
4
1 2
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B97
R67
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
1
2
3 4 5 6
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