Subaru 1600 Service Manual page 208

EMISSION CONTROL SYSTEM
Trouble code 52
IG ON, EtG OFF
Disconnect ECM
connector.
Check if
voltage between
check connector's
solenoid valve I terminal
(LtY) and ground
terminal for drive
(B) is below
2V.
YES
Check if
voltage between
solenoid valve I
connector (LtY) line
and car body is
below 2V.
Check if
voltage between
NO
Disconnect solenoid
valve I connector.
Check if
resistance between
both terminals solenoid
valve I is below
IOn.
NO
Replace ECM.
NO
Solenoid valve I (LtY)
circuit harness broken.
Repair.
solenoid valve I NO
connector (BtW) line
>----------.
and car body is rr=================~
below2V.
YES
,..,
......
X
Replace solenoid
valve I.