Subaru Legacy (2005 year). Service manual — part 153
EN(H4SO 2.0)(diag)-201
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)-202
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BT:DTC P2109 THROTTLE/PEDAL POSITION SENSOR “A” MINIMUM STOP
PERFORMANCE
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).>
BU:DTC P2111 THROTTLE ACTUATOR CONTROL SYSTEM - STUCK 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).>
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) Measure the resistance between electronic
throttle control relay terminals.
Terminals
No. 7 — No. 8:
Is the resistance more than 1
M
Ω?
Replace the elec-
tronic throttle con-
trol relay.
2
CHECK SHORT CIRCUIT OF ELECTRONIC
THROTTLE CONTROL RELAY POWER SUP-
PLY.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control relay connector and chassis
ground.
Connector & terminal
(B362) No. 7 (+) — Chassis ground (
−
):
Is the voltage more than 5 V?
Repair the power
supply short cir-
cuit of harness
between ECM and
electronic throttle
control relay.
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) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
(B137) No. 9 — Chassis ground:
Is the resistance more than 1
M
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).>
Repair the ground
short circuit of har-
ness between
ECM and elec-
tronic throttle con-
trol relay.
EN(H4SO 2.0)(diag)-203
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BV:DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” CIRCUIT
LOW INPUT
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Poor driving performance
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-03486
E
C:
ECM
B136
B137
D:
B315
ACCELERATOR
PEDAL POSITION
SENSOR
3
5
4
1
2
6
D25
D29
D31
C17
D30
C18
C2
C6
B21
E2
C5
B83
1 2 3 4
5 6 7 8
MAIN
SUB
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
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
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
B134
A:
C:
D:
B122
B138
D19
C1
A: B134
A2
37
36
35
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
1 2 3 4 5 6
B315
D1
MT
AT
AT
B138 :LHD
B122 :RHD
B83
:LHD
B138 :RHD
*
*
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
*
*
EN(H4SO 2.0)(diag)-204
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main accelerator pedal
position 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 more than 0.4 V? Go to step 2.
2
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator pedal position sensor.
Is there poor contact?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
3
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between ECM con-
nector and accelerator pedal position sensor
connector.
Connector & terminal
(B137) No. 29 — (B315) No. 5:
(B137) No. 25 — (B315) No. 3:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
4
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 29 — Chassis ground:
(B137) No. 25 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the chas-
sis short circuit of
harness.
5
CHECK POWER SUPPLY OF ACCELERA-
TOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and engine
ground.
Connector & terminal
(B315) No. 3 (+) — Engine ground (
−
):
Is the voltage 4.5 — 5.5 V?
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.0)-
34, Engine Con-
trol Module
(ECM).>
6
CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor.
Terminals
No. 3 — No. 4:
Is the resistance 1.2 — 4.8
k
Ω?
Replace the accel-
erator pedal posi-
tion sensor.
7
CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor.
Terminals
No. 5 — No. 4:
Check the measured value is within the specifi-
cation without depressing the accelerator
pedal.
Is the resistance 0.2 — 1.0
k
Ω?
Replace the accel-
erator pedal posi-
tion sensor.
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