Subaru Legacy IV (2008 year). Service manual — part 592
EN(H6DO)(diag)-341
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EJ:DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A”/“B” VOLTAGE
CORRELATION
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-207, DTC P2135 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH “A”/“B” VOLTAGE CORRELATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Improper idling
• Poor driving performance
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B20
1 2 3 4 5 6
E57
1 2 3 4
5 6 7 8
B122
1 2
7 8
3
4
5
6
B362
36
52
34
35
37
E
E2
B21
E
A5
C21
C1
A29
19
E1
B20
A18
C6
A28
6
4
15
*
*
B122
16
E
38
39
20
D5
D4
A19
D7
D1
A3
D2
D3
3
E57
ELECTRONIC THROTTLE
CONTROL
2
1
5
B134
B362
5
7
6
A:
B137
B136
D:
C:
ECM
*
: TERMINAL No. OPTIONAL ARRANGEMENT
E
SBF-7
BATTERY
ELECTRONIC
THROTTLE
CONTROL RELAY
MAIN RELAY
8
6
4
B47
B47
3
4
1
2
5
6
EN-06873
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B136
C:
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
B137
D:
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
B134
A:
B21
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 26 27 28 29 30 31 32 33
34
35
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
EN(H6DO)(diag)-342
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 19 — Chassis ground:
(B134) No. 18 — Chassis ground:
(B134) No. 18 — (B136) No. 6:
(B134) No. 28 — Chassis ground:
Is the resistance 1 M
: or
more?
Go to step 2.
Repair the short
circuit to ground in
harness between
ECM and elec-
tronic throttle con-
trol connector.
2
CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the connector to ECM.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 — Engine ground:
(E57) No. 4 — Engine ground:
Is the resistance 1 M
: or
more?
Go to step 3.
Repair the short
circuit to ground in
harness between
ECM and elec-
tronic throttle con-
trol connector.
Replace the ECM if
defective. <Ref. to
FU(H6DO)-38,
Engine Control
Module (ECM).>
3
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness between
ECM and electronic throttle control connector.
Connector & terminal
(B134) No. 18 — (E57) No. 6:
(B134) No. 28 — (E57) No. 4:
(B134) No. 29 — (E57) No. 3:
Is the resistance less than 1
:? Go to step 4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and electron-
ic throttle control
connector
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the connector to ECM.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 3 — Engine ground:
Is the resistance less than 5
:? Go to step 5.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (–):
(E57) No. 4 (+) — Engine ground (–):
Is the voltage 4.85 V or more?
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control connector.
Go to step 6.
EN(H6DO)(diag)-343
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B134) No. 19 — (B134) No. 18:
(B134) No. 19 — (B134) No. 28:
Is the resistance 1 M
: or
more?
Repair poor con-
tact of the elec-
tronic throttle
control connector.
Replace the elec-
tronic throttle con-
trol if defective.
<Ref. to
FU(H6DO)-13,
Throttle Body.>
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control connector.
Step
Check
Yes
No
EN(H6DO)(diag)-344
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EK:DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D”/“E”
VOLTAGE CORRELATION
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H6DO)-209, DTC P2138 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH “D”/“E” VOLTAGE CORRELATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H6DO)(diag)-52,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H6DO)(diag)-44, PROCEDURE,
Inspection Mode.>.
TROUBLE SYMPTOM:
• Improper idling
• Poor driving performance
WIRING DIAGRAM:
E
C:
ECM
B136
B137
D:
B83
B315
*
*
4
6
5
1
3
2
B21
B23
B29
B22
B31
B30
A3
D2
B21
E2
D1
1 2 3 4
5 6 7 8
B122
B83
D3
A5
C6
B: B135
A: B134
D7
37
35
34
52
36
B122
B315
1 2 3 4 5 6
*
*
*
E
EN-06883
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B136
C:
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
B137
D:
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
B135
B:
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
B134
A:
B21
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 26 27 28 29 30 31 32 33
34
35
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
ACCELERATOR
PEDAL
POSITION
SENSOR
: TERMINAL No. OPTIONAL
ARRANGEMENT
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