Subaru Legacy III (2000-2003 year). Service manual — part 166
EN(H4SO)-276
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BV: DTC P1137 — O2 SENSOR CIRCUIT (BANK 1 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(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01144
F44
B61
6
RHD
RHD
BATTERY
SBF-5
B47
MAIN RELAY
1
2
3
5
4
6
F44
1 2 3 4
5 6 7 8
C16
C5
4
8
B22
E3
ECM
C6
C17
C22
C13
B23
3
2
1
FRONT OXYGEN
(A/F) SENSOR
B18
B135
B:
B136
C:
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B47
3
4
5
6
1
2
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
B18
4
2 1
3
LHD
LHD
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
B135
EN(H4SO)-277
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?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
2
CHECK FRONT OXYGEN (A/F) 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 70
°
C (158
°
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?
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H4SO)-32, 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 FRONT OXYGEN (A/F) SENSOR DA-
TA.
Race engine at speeds from idling to 5,000
rpm for a total of 5 cycles.
Does the measured value exceed the specified
value?
NOTE:
•Normally, A/F mixture ratio is rich with racing
engine.
•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.
1.1
4
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM and front
oxygen (A/F) sensor connector.
3) Measure resistance between ECM and
front oxygen (A/F) sensor.
Connector & terminals
(B136) No. 13 — (B18) No. 1:
(B136) No. 22 — (B18) No. 2:
Is the measured value less than the speci-
fied value?
5
Ω
Repair open circuit
between ECM and
front oxygen (A/F)
sensor.
EN(H4SO)-278
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR.
Measure resistance between ECM and chas-
sis ground.
Connector & terminals
(B136) No. 13 — Chassis ground:
(B136) No. 22 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair ground
short circuit
between ECM and
front oxygen (A/F)
sensor.
6
CHECK EXHAUST SYSTEM.
Check exhaust system parts.
Is there any fault in exhaust system?
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
There is a fault.
Repair or replace
faulty parts.
Replace front oxy-
gen (A/F) sensor.
<Ref. to
FU(H4SO)-41,
Front Oxygen (A/
F) Sensor.>
Step
Value
Yes
No
EN(H4SO)-279
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BW:DTC P1492 — EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION
(LOW INPUT) —
NOTE:
For the diagnostic procedure, refer to DTC P1498. <Ref. to EN(H4SO)-280, DTC P1498 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) —, Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
BX:DTC P1493 — EGR SOLENOID VALVE SIGNAL #1 CIRCUIT MALFUNCTION
(HIGH INPUT) —
NOTE:
For the diagnostic procedure, refer to DTC P1499. <Ref. to EN(H4SO)-282, DTC P1499 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) —, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
BY:DTC P1494 — EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION
(LOW INPUT) —
NOTE:
For the diagnostic procedure, refer to DTC P1498. <Ref. to EN(H4SO)-280, DTC P1498 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) —, Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
BZ:DTC P1495 — EGR SOLENOID VALVE SIGNAL #2 CIRCUIT MALFUNCTION
(HIGH INPUT) —
NOTE:
For the diagnostic procedure, refer to DTC P1499. <Ref. to EN(H4SO)-282, DTC P1499 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) —, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
CA:DTC P1496 — EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION
(LOW INPUT)—
NOTE:
For the diagnostic procedure, refer to DTC P1498. <Ref. to EN(H4SO)-280, DTC P1498 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (LOW INPUT) —, Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
CB:DTC P1497 — EGR SOLENOID VALVE SIGNAL #3 CIRCUIT MALFUNCTION
(HIGH INPUT) —
NOTE:
For the diagnostic procedure, refer to DTC P1499. <Ref. to EN(H4SO)-282, DTC P1499 — EGR SOLENOID
VALVE SIGNAL #4 CIRCUIT MALFUNCTION (HIGH INPUT) —, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
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