Subaru 1600 Service Manual page 206

EMISSION CONTROL SYSTEM
Trouble code 31
IG ON, EIG OFF
Disconnect duty solenoid
connector.
Check if
voltage between
duty solenoid connector
(B/W) line and car
body is below
2V.
NO
IGOFF
Check if
YES
resistance between YES
Check power source.
both terminals of duty
>---------,
solenoid is over
lOOn.
NO
!'
Check if
resistance between
. duty solenoid terminal
and car body
is
below
IOn.
YES
NO
Replace duty solenoid.
Duty solenoid
(Y/R)
circuit harness is broken.
Repair.
5-39
[I I
Im~l ~