Subaru Legacy (2005 year). Service manual — part 156
EN(H4SO 2.0)(diag)-213
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BZ:DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” / “B”
VOLTAGE CORRELATION
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.>.
EN(H4SO 2.0)(diag)-214
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)-215
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 main 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 more than 0.4 V? Go to step 2.
2
CHECK SENSOR OUTPUT.
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 more than 0.8 V? Go to step 3.
3
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
Is there poor contact?
Repair the poor
contact.
4
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. 23 — (E78) No. 5:
(B137) No. 24 — (E78) No. 2:
LHD model
(B136) No. 17 — (E78) No. 4:
RHD model
(B136) No. 17 — (E78) No. 6:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 23 — Chassis ground:
(B137) No. 24 — Chassis ground:
(B136) No. 17 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the ground
short circuit of har-
ness.
6
CHECK SENSOR POWER SUPPLY.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
LHD model
(E78) No. 4 (+) — Engine ground (
−
):
RHD model
(E78) No. 6 (+) — 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).>
EN(H4SO 2.0)(diag)-216
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7
CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E78) No. 5 — Engine ground:
(E78) No. 2 — Engine ground:
Is the resistance more than 10
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).>
8
CHECK SENSOR OUTPUT.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) Read the data of main 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 4.63
V?
9
CHECK SENSOR OUTPUT.
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?
10
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
Is there poor contact?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
11
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. 23 — (E78) No. 5:
(B137) No. 24 — (E78) No. 2:
LHD model
(B136) No. 17 — (E78) No. 4:
RHD model
(B136) No. 17 — (E78) No. 6:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
12
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).>
Step
Check
Yes
No
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