Subaru Legacy (2005 year). Manual — part 193
EN(H4SO 2.5)(diag)-57
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
C: CHECK POWER SUPPLY AND GROUND LINE OF ENGINE CONTROL MOD-
ULE (ECM)
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, PRO-
CEDURE, 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-03511
SBF-6
MAIN SBF
SBF-7
B72
B6
B5
A6
D2
A7
B12
D3
D7
D1
B19
No.12
B47
E2
B21
6
5
E
E
3
6
B134
B135
A:
D: B137
B:
B4
52
37
36
34
47
3
4
1
2
5
6
B47
No.13
B1
35
B134
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
B135
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
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
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
B72
1
3
4 5 6
2
A:
B:
D:
1
2
1
*
2
*
4
3
ECM
1
*
2
*
MAIN RELAY
TO IGNITION COIL
IGNITION
SWITCH
BATTERY
LHD WITH IMMOBILIZER: D16
LHD WITHOUT IMMOBILIZER: D17
RHD : D16
LHD WITH IMMOBILIZER: D14
LHD WITHOUT IMMOBILIZER: D15
RHD : D14
EN(H4SO 2.5)(diag)-58
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?
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 MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to main relay terminals
No. 1 and No. 2.
4) Measure the resistance between main relay
terminals.
Terminals
No. 3 — No. 5:
No. 4 — No. 6:
Is the resistance less than 10
Ω?
Replace the main
relay.
3
CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 6 — Chassis ground:
(B134) No. 7 — Chassis ground:
(B135) No. 1 — Chassis ground:
(B135) No. 4 — Chassis ground:
(B135) No. 12 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
(B137) No. 3 — Chassis ground:
(B137) No. 7 — Chassis ground:
Is the resistance less than 5
Ω?
Repair the open
circuit of harness
between ECM
connector and
engine grounding
terminal.
4
CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 19 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 5.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
5
CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
RHD model
(B137) No. 14 (+) — Chassis ground (
−
):
LHD model with immobilizer
(B137) No. 14 (+) — Chassis ground (
−
):
LHD model without immobilizer
(B137) No. 15 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 6.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
6
CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
(B47) No. 1 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 7.
Repair the open
circuit of harness
between ECM
connector and
main relay connec-
tor.
EN(H4SO 2.5)(diag)-59
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
7
CHECK INPUT VOLTAGE OF ECM.
1) Connect the connectors to ECM and main
relay.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
RHD model
(B137) No. 16 (+) — Chassis ground (
−
):
LHD model with immobilizer
(B137) No. 16 (+) — Chassis ground (
−
):
LHD model without immobilizer
(B137) No. 17 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 8.
Repair the open or
ground short cir-
cuit of harness
between ECM
connector and
main relay connec-
tor.
8
CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
(B47) No. 5 (+) — Chassis ground (
−
):
(B47) No. 6 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 9.
Repair the open or
ground short cir-
cuit of harness of
power supply cir-
cuit.
9
CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 5 (+) — Chassis ground (
−
):
(B135) No. 6 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Check ignition
control system.
<Ref. to EN(H4SO
2.5)(diag)-60,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Failure.>
Repair the open or
ground short cir-
cuit of harness
between ECM
connector and
main relay connec-
tor.
Step
Check
Yes
No
EN(H4SO 2.5)(diag)-60
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
D: IGNITION CONTROL SYSTEM
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, 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.
BATTERY
5
MAIN RELAY
17
B21
E2
E12
SBF-7
15A
13
49
15
1
2
3
4
B135
ECM
18
3
4
1
2
IGNITION COIL
&
IGNITOR ASSY
B47
E
E
1
2
RELAY HOLDER
B225
B135
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
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
3
4
1
2
5
6
B47
1 2 3 4
E12
9
10
1
2
3
4
5
6
7
8
11 12
14
15 16
13
18
19 20
17
22
23 24
21
38
39 40
37
34
35 36
33
30
31 32
29
26
27 28
25
B225
EN-03454
3
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