Subaru Legacy IV (2008 year). Service manual — part 314
EN(H4DOTC)(diag)-77
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
F: FUEL INJECTOR CIRCUIT
CAUTION:
• Check or repair only faulty parts.
• After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(di-
ag)-52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43,
PROCEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05668
E
#4
1
2
SBF-7
#3
1
2
#2
1
2
B21
#1
1
2
48
54
53
52
51
8
9
10
11
1 2
5
3
6
4
2
1
B21
B137
E5
E5
E2
E6
E6
E16
E16
E17
B47
E17
B47
3
4
1
2
5
6
B137
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
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
MAIN RELAY
ECM
BATTERY
FUEL INJECTOR
EN(H4DOTC)(diag)-78
Diagnostics for Engine Starting Failure
ENGINE (DIAGNOSTICS)
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 injector emit
operating sound?
Check the fuel
pressure. <Ref. to
ME(H4DOTC)-25,
INSPECTION,
Fuel Pressure.>
Go to step 2.
2
CHECK POWER SUPPLY TO EACH FUEL IN-
JECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector.
3) Turn the ignition switch to ON.
4) Measure the voltage between fuel injector
connector and the 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 10 V or more?
Go to step 3.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
main relay and fuel
injector connector
• Poor contact of
main relay connec-
tor
• Poor contact of
coupling connector
3
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B137) No. 8 — (E5) No. 1:
(B137) No. 9 — (E16) No. 1:
(B137) No. 10 — (E6) No. 1:
(B137) No. 11 — (E17) No. 1:
Is the resistance less than 1
:? Go to step 4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and fuel in-
jector connector
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B137) No. 8 — Chassis ground:
(B137) No. 9 — Chassis ground:
(B137) No. 10 — Chassis ground:
(B137) No. 11 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 5.
Repair the short
circuit to ground in
harness between
ECM and fuel
injector connector.
5
CHECK EACH FUEL INJECTOR.
Measure the resistance between each fuel
injector terminals.
Terminals
No. 1 — No. 2:
Is the resistance between 5 —
20
:?
Go to step 6.
Replace the faulty
fuel injector. <Ref.
to FU(H4DOTC)-
38, Fuel Injector.>
6
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.
Inspection using
“General Diagnos-
tic Table” <Ref. to
EN(H4DOTC)(diag)
-370, INSPEC-
TION, General
Diagnostic Table.>
EN(H4DOTC)(diag)-79
Diagnostic Procedure for Subaru Select Monitor Communication
ENGINE (DIAGNOSTICS)
18.Diagnostic Procedure for Subaru Select Monitor Communication
A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE
DIAGNOSIS:
Open or short circuit in data link connector
TROUBLE SYMPTOM:
Subaru Select Monitor communication failure
WIRING DIAGRAM:
EN-06954
: TERMINAL No. OPTIONAL ARRANGEMENT
*
No. 13
E
BATTERY
B40
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
B21
1 2 3 4 5 6 7 8 9 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
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
B40
DATA LINK
CONNECTOR
4
5
7
16
B122
*
*
1 2 3 4
5 6 7 8
B122
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
B136
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
33 34
29
32
30 31
B134
A:
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
B137
D:
D2
A5
D3
E2
B21
E
ECM
B134
A:
C: B136
D: B137
D7
D1
C6
C16
35
34
40
36
37
EN(H4DOTC)(diag)-80
Diagnostic Procedure for Subaru Select Monitor Communication
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY CIRCUIT.
Connect the SDI (Subaru Diagnosis Interface)
or general scan tool to data link connector.
Does SDI or general scan tool
turn ON?
Go to step 4.
Go to step 2.
2
CHECK POWER SUPPLY CIRCUIT.
Measure the voltage between data link connec-
tor and chassis ground.
Connector & terminal
(B40) No. 16 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 3.
Repair the power
supply circuit.
NOTE:
In this case, repair
the following item:
• Open or ground
short circuit of har-
ness between bat-
tery and data link
connector
• Blown out of fuse
(M/B No. 13)
3
CHECK HARNESS BETWEEN DATA LINK
CONNECTOR AND CHASSIS GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B40) No. 4 — Chassis ground:
(B40) No. 5 — Chassis ground:
Is the resistance less than 5
:? Repair the poor
contact of data link
connector.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and data link
connector
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
1) Disconnect the connector from ECM, TCM,
VDC CU, airbag CM and body integrated unit.
CAUTION:
When disconnecting the connector from air-
bag control module, always follow the pre-
cautions on AB section. <Ref. to AB-4,
CAUTION, General Description.>
2) Measure the resistance of harness between
ECM and data link connector.
Connector & terminal
(B136) No. 16 — (B40) No. 7:
Is the resistance less than 1
:? Go to step 5.
Repair the open
circuit of harness
between ECM and
data link connec-
tor.
5
CHECK HARNESS BETWEEN ECM AND
DATA LINK CONNECTOR.
Measure the resistance between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 — Chassis ground:
Is the resistance 1 M
: or
more?
Repair the poor
contact in the ECM
or data link con-
nector.
Repair the ground
short circuit of har-
ness between
ECM and data link
connector.
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