Subaru Legacy (2005 year). Service manual — part 129
EN(H4SO 2.0)(diag)-105
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>
2
CHECK FRONT OXYGEN (A/F) SENSOR DA-
TA.
1) Start the engine.
2) While observing the Subaru Select Monitor
or general scan tool screen, warm-up the
engine until engine coolant temperature is
above 70
°C (160°F).
If the engine is already warmed-up, operate at
idle speed for at least 1 minute.
3) Read the data of front oxygen (A/F) sensor
signal using Subaru Select Monitor or general
scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO 2.0)(diag)-25, Subaru Select
Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the voltage 0.85 — 1.15 V?
3
CHECK FRONT OXYGEN (A/F) SENSOR DA-
TA.
1) Race the engine at speed from idling to
5,000 rpm for a total of 5 cycles.
2) Read the data of front oxygen (A/F) sensor
signal during racing using Subaru Select Moni-
tor or general scan tool.
NOTE:
• Air fuel ratio is rich at normal condition or
during racing.
• To increase engine speed to 5,000 rpm,
slowly depress accelerator pedal, taking
approximately 5 seconds, and quickly release
accelerator pedal to decrease engine speed.
• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO 2.0)(diag)-25, Subaru Select
Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
Is the voltage more than 1.1 V? Go to step 6.
EN(H4SO 2.0)(diag)-106
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
4
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance between ECM and
front oxygen (A/F) sensor.
Connector & terminal
LHD model
(B136) No. 33 — (E24) No. 1:
(B136) No. 35 — (E24) No. 2:
RHD model
(B136) No. 33 — (E24) No. 4:
(B136) No. 35 — (E24) No. 6:
Is the resistance less than 5
Ω?
Repair the open
circuit between
ECM and front
oxygen (A/F) sen-
sor.
5
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 33 — Chassis ground:
(B136) No. 35 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the ground
short circuit
between ECM and
front oxygen (A/F)
sensor.
6
CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following items.
• Loose part and incomplete installation of
exhaust system
• Damage (crack, hole etc.) of parts
• Looseness of front oxygen (A/F) sensor
• Looseness and ill fitting of parts between
front oxygen (A/F) sensor and rear oxygen
sensor
Is there any fault in exhaust
system?
Repair or replace
faulty parts.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO 2.0)-32,
Front Oxygen (A/
F) Sensor.>
Step
Check
Yes
No
EN(H4SO 2.0)(diag)-107
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
P: 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, 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.>.
WIRING DIAGRAM:
EN-03475
3
4
1
2
5
6
B47
SBF-5
E
B47
E24
5
3
4
6
2
1
C34
C35
C33
B3
B2
B1
B135
E
B5
B6
52
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
ECM
BATTERY
FRONT OXYGEN
(A/F) SENSOR
MAIN RELAY
B136
B:
C:
1
2
3
4
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:
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
C:
E24
3
2
*
1
*
*
3
LHD : 4
RHD : 1
*
1
*
*
2
3
3
1
6 5 4
2
: RHD
: LHD
LHD : 1
RHD : 4
LHD : 2
RHD : 6
EN(H4SO 2.0)(diag)-108
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
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
(B136) No. 33 — Chassis ground:
(B136) No. 35 — Chassis ground:
Is the resistance more than 1
M
Ω?
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO 2.0)-32,
Front Oxygen (A/
F) Sensor.>
Repair the ground
short circuit of har-
ness between
ECM and front
oxygen (A/F) sen-
sor connector.
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