Subaru Legacy IV (2008 year). Service manual — part 379
EN(H4DOTC)(diag)-337
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(H4DOTC)-14,
Throttle Body.>
Repair the short
circuit to power in
the harness
between ECM and
electronic throttle
control connector.
Step
Check
Yes
No
EN(H4DOTC)(diag)-338
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
DZ:DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D”/“E” VOLTAGE
CORRELATION
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-224, DTC P2138 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “D”/“E” 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(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05690
B315
C: B136
B137
D:
B83
B315
*
*
4
6
5
1
3
2
B21
B23
B29
B22
B31
B30
D2
B21
E2
D1
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:
C:
D:
B122
B83
D3
A5
C6
B: B135
A: B134
D7
37
35
34
40
36
B122
1 2 3 4 5 6
*
*
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:
E
*
ACCELERATOR PEDAL
POSITION SENSOR
ECM
: TERMINAL No. OPTIONAL
ARRANGEMENT
EN(H4DOTC)(diag)-339
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
Main accelerator pedal position sensor
signal
(B135) No. 23 (+) — Chassis ground (–):
Sub accelerator pedal position sensor
signal
(B135) No. 31 (+) — Chassis ground (–):
Is the difference in measured
values for the main accelerator
pedal position sensor signal
and the sub accelerator pedal
position sensor signal 0 V?
Go to step 3.
Go to step 2.
2
CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 6 (+) — Chassis ground (–):
(B315) No. 3 (+) — Chassis ground (–):
Is the difference in measured
values for the main accelerator
pedal position sensor signal
and the sub accelerator pedal
position sensor signal 0 V?
Replace the accel-
erator pedal. <Ref.
to SP(H4SO)-3,
Accelerator
Pedal.>
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.
• Short circuit to
ground in harness
between ECM and
accelerator pedal
position sensor
connector.
3
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR
CONNECTOR.
Check the resistance of harness between the
accelerator pedal position sensor connector
and chassis ground.
Connector & terminal
(B315) No. 5 — Chassis ground:
(B315) No. 2 — Chassis ground:
Is the resistance less than 5
:? Repair the poor
contact of ECM
connector.
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.
• Open circuit of
harness between
ECM and engine
ground
• Poor contact in
ECM connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-340
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EA:DTC P2419 EVAPORATIVE EMISSION SYSTEM SWITCHING VALVE CONTROL
CIRCUIT LOW
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-226, DTC P2419 EVAPORATIVE EMISSION SYS-
TEM SWITCHING VALVE CONTROL CIRCUIT LOW, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
52, OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-43, PRO-
CEDURE, Inspection Mode.>.
WIRING DIAGRAM:
EN-05679
SBF-7
E4
B47
E
5
3
6
4
2
1
2
1
C17
C28
D29
C7
R15
R213
R68
R144
R1
B97
14
15
2
2
1
1
7
1
5
E52
2
1
E52
R144
E4
B47
R67
B97
R213
R68
1 2
3
4
1
2
5
6
B21
1 2
1 2
3
4 5 6 7 8
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
1
2
3 4 5 6
1 2 3 4
5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
R46
R67
6
B21
E2
11
48
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:
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
D:
B136
C:
B137
D:
44
MAIN RELAY
ECM
BATTERY
DRAIN VALVE
PRESSURE
CONTROL
SOLENOID VALVE
PURGE CONTROL
SOLENOID VALVE 1
PURGE CONTROL
SOLENOID VALVE 2
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