1996 SUBARU LEGACY Service Repair Manual

Page 1945 of 2890

SUBARU LEGACY 1996  Service Repair Manual OBD0229
N: DTC P0139
—REAR OXYGEN SENSOR CIRCUIT SLOW
RESPONSE (RO2
—R)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10N1Check DTC P0136 on display.
CAUTION:
After repair or repla

Page 1946 of 2890

SUBARU LEGACY 1996  Service Repair Manual WIRING DIAGRAM:
RHD Model
B2M0789
10N1
CHECK DTC P0136 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0136?
: Inspect DTC P0136 using“10. Diagnostics Chart
w

Page 1947 of 2890

SUBARU LEGACY 1996  Service Repair Manual OBD0232
O: DTC P0141
—REAR OXYGEN SENSOR HEATER
CIRCUIT MALFUNCTION (RO2H)—
DTC DETECTING CONDITION:
Two consecutive trips with fault
10O1Check DTC P0135 on display.
10O2Connect Subaru Select Mon

Page 1948 of 2890

SUBARU LEGACY 1996  Service Repair Manual WIRING DIAGRAM:
LHD Model
B2M0761
180
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

Page 1949 of 2890

SUBARU LEGACY 1996  Service Repair Manual WIRING DIAGRAM:
RHD Model
B2M0790
10O1
CHECK DTC P0135 ON DISPLAY.
: Does the Subaru select monitor or OBD-II
general scan tool indicate DTC P0141 and
P0135 at the same time?
: Go to next step 1).
:

Page 1950 of 2890

SUBARU LEGACY 1996  Service Repair Manual B2M0553A
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between ECM connec-
tor and chassis ground.
: Connector & terminal
(B84) No. 42—Chassis gr

Page 1951 of 2890

SUBARU LEGACY 1996  Service Repair Manual B2M0554A
10O3CHECK OUTPUT SIGNAL FROM ECM.
(USING VOLTAGE METER.)
1) Start and idle the engine.
2) Measure voltage between ECM connector and chassis
ground.
: Connector & terminal
(B84) No. 37 (+)—C

Page 1952 of 2890

SUBARU LEGACY 1996  Service Repair Manual OBD0710C
10O4CHECK POWER SUPPLY TO REAR OXY-
GEN SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from rear oxygen sensor.
3) Turn ignition switch to ON.
4) Measure voltage between rear