Subaru 1600 Service Manual page 212

Trouble code 34
Check if
voltage between
check connector's
auto choke tenninal
(L) and car body is
over lOY.
Check if
voltage between
PTC relay connector
(L) line and car body
is over lOY.
Check if
voltage between
PTC relay connector
(B/W) line and car
body is over
lOY.
YES
YES
NO
EMISSION CONTROL SYSTEM
Replace ECM.
PTC (L) circuit harness
broken. Repair.
Disconnect PTC relay
connector.
Check if
resistance between
PTC relay connector
(L) line and car body
is below SU.
NO
Check power source.
YES
PTC (L) circuit harness
short-circuited.
Repair.