1997 SUBARU LEGACY Service Repair Manual

Page 2025 of 3342

SUBARU LEGACY 1997  Service Repair Manual B2M1073A
10N3CHECK HARNESS BETWEEN FRONT
OXYGEN SENSOR AND ECM CONNEC-
TOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from front oxygen sensor.
3) Turn ignition switch to ON.
4) Measure

Page 2026 of 3342

SUBARU LEGACY 1997  Service Repair Manual OBD0209
O: DTC P0133
—FRONT OXYGEN SENSOR CIRCUIT SLOW
RESPONSE—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1072
CAUTION:
After repair or replacement of

Page 2027 of 3342

SUBARU LEGACY 1997  Service Repair Manual 10O1
CHECK DTC P0130 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0130?
: Inspect DTC P0130 using“10. Diagnostics Chart
with Trouble Code”. <Ref. to 2-7 [

Page 2028 of 3342

SUBARU LEGACY 1997  Service Repair Manual OBD0212
P: DTC P0135
—FRONT OXYGEN SENSOR HEATER
CIRCUIT MALFUNCTION—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1074
CAUTION:
After repair or replaceme

Page 2029 of 3342

SUBARU LEGACY 1997  Service Repair Manual 10P1
CHECK DTC P0141 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0135 and
P0141 at the same time?
: Go to next step 1).
: Go to step10P2.
B2M0547A
1) Turn ig

Page 2030 of 3342

SUBARU LEGACY 1997  Service Repair Manual NOTE:
In this case, repair the following:
Poor contact in front oxygen sensor connector
Poor contact in ECM connector
: Go to step10P3.
OBD-II scan tool
For detailed operation procedures, refer to

Page 2031 of 3342

SUBARU LEGACY 1997  Service Repair Manual : Go to step10P5.
: Repair power supply line.
NOTE:
In this case, repair the following:
Open circuit in harness between main relay and front
oxygen sensor connector
Poor contact in front oxygen sens

Page 2032 of 3342

SUBARU LEGACY 1997  Service Repair Manual OBD0220
Q: DTC P0136
—REAR OXYGEN SENSOR CIRCUIT
MALFUNCTION—
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
WIRING DIAGRAM:
B2M1077
CAUTION:
After repair or replacement of fa