Subaru Legacy (2005 year). Service manual — part 135
EN(H4SO 2.0)(diag)-129
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
EN-03508
SBF-7
B134
A:
B137
B136
D:
B362
E1
B20
C:
E
E
E
D6
D9
38
39
20
19
16
15
E2
B21
E78
2
5
D4
D5
D2
C17
C6
A2
C2
C5
C1
C30
36
35
37
D24
D23
ECM
5
7
8
6
B362
B20
B21
E78
1 2
7 8
3
4
5
6
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
34 35
36 37 38 39 40 41
48 49
50 51 52 53 54
42 43
44 45
46 47
26 27 28 29 30 31 32 33
1 2 3 4
5 6 7 8
1
2
7
8 9
5
6
3
4
10 11 12
19 20 21
29
30 31
13 14 15 16 17
27
28
18
22 23
24 25
26
1
2
8 9
5
6
3
4
10 11 12
19 20 21
29 30
31
13 14 15 16
17
27
28
18
22 23 24 25 26
7
32 33 34 35
B136
C:
B137
D:
BATTERY
MAIN RELAY
ELECTRONIC
THROTTLE
CONTROL RELAY
ELECTRONIC
THROTTLE CONTROL
D7
D1
D3
C18
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
A:
1
3
4 5 6
2
B83
:LHD
B138 :RHD
B83
:LHD
B138 :RHD
B83
B138
*
1
: TERMINAL No.
RANDOM ARRANGEMENT
AMONG 3,4,7, AND 8
*
2
: TERMINAL No.
RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
*
3
LHD : 4
RHD : 6
*
4
LHD : 6
RHD : 4
*
5
LHD : 3
RHD : 1
*
6
LHD : 1
RHD : 3
*
1
*
1
*
3
*
4
*
5
*
6
*
2
*
2
1 2 3 4
5 6 7 8
9 10 11 12
14
13
15 16
EN(H4SO 2.0)(diag)-130
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of sub throttle sensor signal
using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO 2.0)(diag)-25, Subaru Select Mon-
itor.>
Is the voltage less than 4.73
V?
2
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
Is there poor contact in con-
nector between ECM and elec-
tronic throttle control?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
3
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from electronic
throttle control.
4) Measure the resistance between ECM con-
nector and electronic throttle control connector.
Connector & terminal
(B137) No. 24 — (E78) No. 2:
LHD model
(B136) No. 18 — (E78) No. 1:
RHD model
(B136) No. 18 — (E78) No. 3:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
4
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the ECM connector.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
LHD model
(E78) No. 1 — Engine ground:
RHD model
(E78) No. 3 — Engine ground:
Is the resistance less than 5
Ω?
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.0)-
34, Engine Con-
trol Module
(ECM).>
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
Measure the voltage between electronic throt-
tle control connector and engine ground.
Connector & terminal
(E78) No. 2 (+) — Engine ground (
−
):
Is the voltage less than 10 V?
Repair the battery
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.
6
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between connector
terminals.
Connector & terminal
(B137) No. 24 — (B136) No. 17:
Is the resistance more than 1
M
Ω?
Repair the poor
contact. Replace
the electronic
throttle control.
Sensor power sup-
ply circuit may be
shorted.
EN(H4SO 2.0)(diag)-131
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AA:DTC P0301 CYLINDER 1 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO 2.0)(diag)-132, DTC P0304 CYLIN-
DER 4 MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
AB:DTC P0302 CYLINDER 2 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO 2.0)(diag)-132, DTC P0304 CYLIN-
DER 4 MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
AC:DTC P0303 CYLINDER 3 MISFIRE DETECTED
NOTE:
For the diagnostic procedure, refer to DTC P0304. <Ref. to EN(H4SO 2.0)(diag)-132, DTC P0304 CYLIN-
DER 4 MISFIRE DETECTED, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
EN(H4SO 2.0)(diag)-132
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AD:DTC P0304 CYLINDER 4 MISFIRE DETECTED
DTC DETECTING CONDITION:
• Detects when malfunction occurs in 2 continuous driving cycles.
• Immediately at fault recognition(A misfire which could damage catalyst occurs.)
TROUBLE SYMPTOM:
• Engine stalls.
• Erroneous idling
• Rough driving
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO 2.0)(diag)-
38, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.0)(diag)-32, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-03474
E6
E17
E5
E16
1 2
1
2
1
2
1
2
1
2
34
27
17
33
42
48
43
44
45
ECM
B134
E5
E16
E6
E17
B21
E2
FUEL INJECTOR
No. 1
FUEL INJECTOR
No. 2
FUEL INJECTOR
No. 3
FUEL INJECTOR
No. 4
BATTERY
SBF-7
B47
MAIN RELAY
1
2
4
6
3
5
B47
3
4
1
2
5
6
E
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
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
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