Subaru Legacy III (2000-2003 year). Service manual — part 503
EN(H4DOSTC)-182
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AR:DTC P1111 — ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNC-
TION (HIGH INPUT) —
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection
Mode.> .
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor indicate DTC
P1111?
DTC P1111 indicated.
Replace the ECM.
<Ref. to
FU(H4DOSTC)-
40, Engine Con-
trol Module.>
NOTE:
Atmospheric pres-
sure sensor is built
into ECM.
It is not necessary
to inspect DTC
P1111.
EN(H4DOSTC)-183
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4DOSTC)-184
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AS: DTC P1130 — O2 SENSOR CIRCUIT (OPEN) (BANK1 SENSOR1) —
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-00933
BATTERY
MAIN RELAY
SBF-5
B47
1
2
3
5
4
6
E
E
E3
3
8
9
4
5
19
29
18
ECM
B137
B22
2
4
1
3
B18
FRONT OXYGEN
(A/F) SENSOR
3 4
1 2
3
4
1
2
5
6
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B22
B47
B18
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
EN(H4DOSTC)-185
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
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 connectors from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance of harness
between ECM and front oxygen (A/F) sen-
sor connector.
Connector & terminal
(B137) No. 29 — (B18) No. 3:
(B137) No. 19 — (B18) No. 4:
Is the measured value less than the speci-
fied value?
1
Ω
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and front
oxygen (A/F) sen-
sor connector
• Poor contact in
front oxygen (A/F)
sensor connector
• Poor contact in
ECM connector
2
CHECK POOR CONTACT.
Check poor contact in front oxygen (A/F) sen-
sor connector.
Is there poor contact in front oxygen (A/F) sen-
sor connector?
There is poor contact.
Repair the poor
contact in front
oxygen (A/F) sen-
sor connector.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4DOSTC)-
38, Front Oxygen
(A/F) Sensor.>
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