Subaru Legacy (2005 year). Service manual — part 208
EN(H4SO 2.5)(diag)-117
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK OPTION CODE.
Is the option code EC, EK, EH,
ER or K4?
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
2
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO
2.5)(diag)-69, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0125.
3
CHECK ENGINE COOLING SYSTEM.
NOTE:
Check the following items.
• Thermostat open stuck
• Engine coolant level
• Coolant freeze
• Tire diameter
Is there any fault in engine
cooling system?
Replace the ther-
mostat. <Ref. to
CO(H4SO 2.0)-18,
Thermostat.>
Replace the
engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO 2.5)-20,
Engine Coolant
Temperature Sen-
sor.>
EN(H4SO 2.5)(diag)-118
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Q: DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
EN-03457
3
4
1
2
5
6
B327
SBF-5
E
E
B327
E24
6
4
5
3
2
1
25
33
26
3
2
6
7
52
B134
B21
E2
B21
E2
50
51
3
4
E2
B21
E
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
E24
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
ECM
BATTERY
FRONT OXYGEN
(A/F) SENSOR
OXYGEN (A/F)
SENSOR RELAY
1
3
4 5 6
2
3
4
1
6
EN(H4SO 2.5)(diag)-119
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK OPTION CODE.
Is the option code EC, EK, EH,
ER or K4?
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
2
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 26 — Chassis ground:
(B134) No. 33 — Chassis ground:
Is the resistance more than 1
M
Ω?
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO 2.5)-35,
Front Oxygen (A/
F) Sensor.>
Repair the ground
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
EN(H4SO 2.5)(diag)-120
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
R: DTC P0132 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
EN-03457
3
4
1
2
5
6
B327
SBF-5
E
E
B327
E24
6
4
5
3
2
1
25
33
26
3
2
6
7
52
B134
B21
E2
B21
E2
50
51
3
4
E2
B21
E
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
E24
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
ECM
BATTERY
FRONT OXYGEN
(A/F) SENSOR
OXYGEN (A/F)
SENSOR RELAY
1
3
4 5 6
2
3
4
1
6
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