Subaru Legacy (2005 year). Service manual — part 150
EN(H4SO 2.0)(diag)-189
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BO:DTC P1560 BACK-UP VOLTAGE CIRCUIT MALFUNCTION
DTC DETECTING CONDITION:
Immediately at fault recognition
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:
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
(B136) No. 7 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Repair the poor
contact in ECM
connector.
EN-03507
BATTERY
IGNITION
SWITCH
MAIN RELAY
SBF-6
MAIN SBF
SBF-7
B72
C4
C3
B14
B5
C6
B6
C1
C2
A7
C5
C7
B13
No.12
B47
E2
B21
2
1
4
6
5
3
ECM
E
E
3
6
B134
B135
A:
D: B137
B:
D1
52
37
36
34
3
4
1
2
5
6
B47
No.13
A2
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:
B136
C:
B136
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
35
C:
SBF-5
TO OXYGEN SENSOR
EN(H4SO 2.0)(diag)-190
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BP:DTC P2100 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT/OPEN
NOTE:
For the diagnostic procedure, refer to DTC P2101. <Ref. to EN(H4SO 2.0)(diag)-190, DTC P2101 THROT-
TLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Di-
agnostic Trouble Code (DTC).>
BQ:DTC P2101 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT RANGE/
PERFORMANCE
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Poor driving performance
• Engine stalls.
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.>.
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
(B136) No. 7 — 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 item:
• Open circuit of
harness between
ECM and battery
• Poor contact in
ECM connector
• Poor contact in
battery terminal
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-191
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)-192
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK ELECTRONIC THROTTLE CON-
TROL RELAY.
1) Turn the ignition switch to OFF.
2) Remove the electronic throttle control relay.
3) Connect the battery to electronic throttle
control relay terminals No. 5 and No. 6.
4) Measure the resistance between electronic
throttle control relay terminals.
Terminals
No. 7 — No. 8:
Is the resistance less than 1
Ω?
Replace the elec-
tronic throttle con-
trol relay.
2
CHECK POWER SUPPLY OF ELECTRONIC
THROTTLE CONTROL RELAY.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B362) No. 8 (+) — Chassis ground (
−
):
(B362) No. 5 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 3.
Repair the open or
ground short cir-
cuit of power sup-
ply circuit.
3
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Turn the ignition switch to ON.
4) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B362) No. 6 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Repair the power
supply short cir-
cuit of harness
between ECM and
electronic throttle
control.
4
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B362) No. 6 — Chassis ground:
(B362) No. 7 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol relay.
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL RE-
LAY.
Measure the resistance between ECM connec-
tor and electronic throttle control relay connec-
tor.
Connector & terminal
(B137) No. 9 — (B362) No. 6:
(B137) No. 6 — (B362) No. 7:
(B137) No. 7 — (B362) No. 7:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between ECM and
electronic throttle
control relay.
6
CHECK SENSOR OUTPUT.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector terminals.
Connector & terminal
(B137) No. 24 (+) — (B136) No. 18 (
−
):
Is the voltage more than 0.3 V? Go to step 7.
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