Subaru Legacy III (2000-2003 year). Service manual — part 378
EN(H6DO)-314
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
CL: DTC P1154 — O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK
2 SENSOR 1) —
NOTE:
For the diagnostic procedure, refer to DTC P1155. <Ref. to EN(H6DO)-314, DTC P1155 — O2 SENSOR
CIRCUIT RANGE/PERFORMANCE (HIGH) (BANK 2 SENSOR 1) —, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
CM:DTC P1155 — O2 SENSOR CIRCUIT RANGE/PERFORMANCE (HIGH)
(BANK 2 SENSOR 1) —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
EN(H6DO)-315
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
• WIRING DIAGRAM:
EN-01087
BATTERY
F44
B61
SBF-5
6
B47
MAIN RELAY
1
2
3
5
4
6
9
8
21
31
2
1
5
B252
E49
ECM
18
29
19
5
4
7
6
20
30
4
1
3
FRONT
OXYGEN
(A/F)
SENSOR RH
E47
2
4
3
1
FRONT
OXYGEN
(A/F)
SENSOR LH
E24
B137
E3
B22
B83
11
8
1
2
3
E2
B21
2
3
E2
B21
20
19
E49
B252
4
8
LHD
RHD
LHD
RHD
B252
B47
3
4
5
6
1
2
E24
E47
B137
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 3 4
5 6 7 8
3
4
1
2
1 2 3 4
5 6 7 8
F44
B21
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B83
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
EN(H6DO)-316
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
2
CHECK FRONT (A/F) OXYGEN SENSOR DA-
TA.
1) Start engine.
2) While observing the Subaru Select Monitor
or OBD-II general scan tool screen, warm-
up the engine until coolant temperature is
above 75
°
C (167
°
F).
If the engine is already warmed-up, operate
at idle speed for at least 1 minute.
3) Read data of front oxygen (A/F) sensor sig-
nal using Subaru Select Monitor or OBD-II
general scan tool.
Is the measured value within the specified
range at idle?
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
• OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
0.85 — 1.15
3
CHECK REAR OXYGEN SENSOR SIGNAL.
1) Race engine at speeds from idling to 5,000
rpm for a total of 5 cycles.
NOTE:
To increase engine speed to 5,000 rpm, slowly
depress accelerator pedal, taking approximate-
ly 5 seconds, and quickly release accelerator
pedal to decrease engine speed.
2) Operate the LED operation mode for
engine.
Does the LED of {Rear O2 Rich Signal}
blink?
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to the
“LED OPERATION MODE FOR ENGINE”.
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
LED blinks.
Repair poor con-
tact in front oxygen
(A/F) sensor and
rear oxygen sen-
sor connector.
Check rear oxygen
sensor circuit.
<Ref. to
FU(H6DO)-45,
Rear Oxygen Sen-
sor.>
EN(H6DO)-317
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
4
CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following items.
• Loose installation of portions
• 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 a fault in exhaust system?
There is a malfunction.
Repair or replace
faulty parts.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H6DO)-43,
Front Oxygen (A/
F) Sensor.>
Step
Value
Yes
No
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