Subaru 2002 IMPREZA Service Manual page 320

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
s the resistance less than 30
2?
Step
CHECK POWER SUPPLY TO REAR OXY-
GEN SENSOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from rear oxygen
sensor.
3)Turn the ignition switch to ON.
4)Measure the voltage between rear oxygen
sensor connector and engine ground or chas-
sis ground.
Connector & terminal
(B19) No. 2 (+)
-
Chassis ground
( - ) I
Repair harness
and connector.
NOTE:
In this case, repair
the following:
Open circuit in
harness between
rear oxygen sen-
sor and ECM con-
nector
Poor contact in
rear oxygen sen-
sor connector
Poor contact in
ECM connector
Poor contact in
coupling connectoi
CHECK REAR OXYGEN SENSOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance between rear oxy-
gen sensor connector terminals.
Terminals
NO.
1 -NO. 2:
Check
;
the voltage more than 10 V?
Yes
30 to step 7 .
No
3epair power sup-
)ly line.
IIOTE:
n this case, repair
he following:
Open circuit in
iarness between
nain relay and
ear oxygen sen-
ior connector
Poor contact in
ear oxygen sen-
;or connector
Poor contact in
:oupling connectoi
3eplace the rear
Ixygen sensor.
:Ref. to FU(D0HC
rURBO)-44, Rear
lxygen Sensor.>
EN(D0HC TURBO)-96