Subaru 1600 Service Manual page 199

Trouble code 23
E/G
OFF
IGON
Disconnect cord from
O
2
sensor.
Connect dry cell
<±l
pole
to O
2
sensor cord and
e
pole to car body.
Check if
voltage between
check connector's
O
2
monitor (R/W)
and ground terminal
for control (8/R)
is over 2V.
Check if
voltage between
check connector's
0
1
monitor (R/W)
and ground terminal
for control (8/R)
is below 1 V.
YES
Remove dry celL
Check if
resistance between
O
2
sensor cord and
car body is
below
IOn.
NO
Replace ECM.
YES
NO
YES
EMISSION CONTROL SYSTEM
,...,
r'"
%
!
0
1
sensor defective.
Replace.
Repair open 0
1
sensor
cord.
O
2
sensor cord short·
circuited. Repair.