Subaru Legacy (2005 year). Service manual — part 479
EN(H6DO)(diag)-229
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CP:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION
DTC DETECTING CONDITION:
Immediately at fault recognition
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:
Step
Check
Yes
No
1
CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 19 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Repair the poor
contact in ECM
connector.
EN-03490
BATTERY
IGNITION
SWITCH
MAIN RELAY
SBF-6
MAIN SBF
SBF-7
B72
B6
B5
D16
A6
D2
A7
B12
D3
D7
D1
B19
D14
No.12
B47
E2
B21
ECM
E
E
3
6
B134
B135
A:
D: B137
B:
B4
52
37
36
34
12
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:
SBF-5
A4
A5
54
3
5
6
4
1
2
TO OXYGEN SENSOR
EN(H6DO)(diag)-230
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
2
CHECK HARNESS BETWEEN ECM AND
MAIN FUSE BOX CONNECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B135) No. 19 — Chassis ground:
Is the resistance less than 10
Ω?
Repair the ground
short circuit of har-
ness between
ECM connector
and battery termi-
nal.
3
CHECK FUSE No. 13.
Is the fuse blown out?
Replace the fuse.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and battery
• Poor contact in
ECM connector
• Poor contact in
battery terminal
Step
Check
Yes
No
EN(H6DO)(diag)-231
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CQ:DTC P2088 INTAKE CAMSHAFT POSITION ACTUATOR CONTROL CIRCUIT
LOW (BANK 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
Erroneous idling
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:
EN-02514
B21
E2
B134
E67
28
2
1
24
23
E67
B21
1 2
18
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
ECM
OIL FLOW CONTROL
SOLENOID VALVE RH
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
EN(H6DO)(diag)-232
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND OIL
FLOW CONTROL SOLENOID VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
oil flow control solenoid valve.
3) Measure the resistance between ECM and
oil flow control solenoid valve.
Connector & terminal
(B134) No. 18 — (E67) No. 1:
(B134) No. 28 — (E67) No. 2:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between ECM and
oil flow control
solenoid valve
connector.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and oil flow
control solenoid
valve connector
• Poor contact in
coupling connector
2
CHECK OIL FLOW CONTROL SOLENOID
VALVE.
1) Remove the oil flow control solenoid valve
connector.
2) Measure the resistance between oil flow
control solenoid valve terminals.
Terminal
No. 1 — No. 2:
Is the resistance 6 — 12
Ω?
Repair the poor
contact in ECM
and oil flow con-
trol solenoid valve.
Replace the oil
flow control sole-
noid valve. <Ref.
to ME(H6DO)-79,
Oil Flow Control
Solenoid Valve.>
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