Subaru IMPREZA 2002 Service Manual page 459

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK ANY OTHER DTC ON DISPLAY.
Check
Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC PO1 17 or PO1 18?
! CHECK THERMOSTAT.
~~
Yes
nspect DTC
'01 17 or PO1 18
sing "List of Diag-
iostic Trouble
;ode (DTC)".
:Ref. to
A t of Diagnostic
rrouble Code
DTC) .>
VOTE:
n this case, it i$
lot
necessary tc
nspect DTC
p0125.
Replace the ther-
mostat. <Ref. to
GO-35, Thermo-
stat.>
IN(S0HC)-77,
Does the thermostat remain
opened?
No
;o to step 2.
Replace the
engine coolant
temperature sen-
sor. <Ref. to
Engine Coolant
Temperature Sen-
sor.>
FU(S0HC)-27,
EN(S0HC)-I 35