Subaru Legacy IV (2008 year). Service manual — part 172
EN(H4SO)(diag)-291
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DH:DTC P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH “E” CIRCUIT
HIGH INPUT
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-192, DTC P2128 THROTTLE/PEDAL POSITION SEN-
SOR/SWITCH “E” CIRCUIT HIGH INPUT, 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(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06844
B315
E
C:
ECM
B136
B137
D:
B83
B315
*
*
4
6
5
1
3
2
D1
D2
1 2 3 4 5 6
B21
E2
D3
B122
1 2 3 4
5 6 7 8
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
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
B:
B134
A:
C:
D:
B83
A5
B: B135
A: B134
D7
36
34
52
35
37
B122
ACCELERATOR
PEDAL
POSITION
SENSOR
E
*
*
: TERMINAL No. OPTIONAL
ARRANGEMENT
*
B21
B23
B29
B22
B31
B30
C6
8
5
6
10 11 12 13 14 15
7
2
1
3
4
16
30
19 20
22
28 29
9
17
18
25
21
23 24
32
31
26 27
33 34
EN(H4SO)(diag)-292
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
accelerator pedal position sensor.
3) Measure the resistance of harness between
ECM and accelerator pedal position sensor
connector.
Connector & terminal
(B135) No. 31 — (B315) No. 3:
(B135) No. 30 — (B315) No. 2:
Is the resistance less than 1
:? Go to step 2.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
the ECM and ac-
celerator pedal po-
sition sensor
connector.
• Poor contact in
joint connector
2
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the connector to ECM.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 2 — Chassis ground:
Is the resistance less than 1
:? Go to step 3.
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
3
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 3 (+) — Chassis ground (–):
Is the voltage 4.85 V or more?
Repair the short
circuit of harness
to power supply
between ECM and
accelerator pedal
position sensor
connector.
Go to step 4.
4
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B135) No. 22 — (B135) No. 31:
Is the resistance 1 M
: or
more?
Repair the poor
contact of acceler-
ator pedal position
sensor connector.
Replace the accel-
erator pedal if
defective. <Ref. to
SP(H4SO)-3,
Accelerator
Pedal.>
Repair the short
circuit of harness
to power supply
between ECM and
accelerator pedal
position sensor
connector.
EN(H4SO)(diag)-293
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DI: DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A”/“B” VOLTAGE
CORRELATION
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-194, 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(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06838
SBF-7
B134
A:
B137
B136
D:
B362
C:
E
C1
C21
D4
D5
A29
A19
D3
D7
D1
D2
A5
A28
A18
C6
ECM
5
8
7
6
B362
B47
B21
E57
B122
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
B134
A:
B136
C:
B137
D:
BATTERY
ELECTRONIC
THROTTLE
CONTROL RELAY
MAIN RELAY
1 2 3 4 5 6
E2
B21
B122
E
E
E
39
20
E57
4
6
1
2
3
5
34
35
36
37
52
*
*
ELECTRONIC
THROTTLE CONTROL
: TERMINAL No. OPTIONAL ARRANGEMENT
*
18
17
38
19
8
5
6
10 11 12 13 14 15
7
2
1
3
4
16
30
19 20
22
28 29
9
17
18
25
21
23 24
32
31
26 27
33 34
3
4
1
2
5
6
6
4
B47
EN(H4SO)(diag)-294
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(H4SO)-39,
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.
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