Subaru 2002 IMPREZA Service Manual page 365

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE [DI AGNOSTICSI
Check
Step
CHECK ANY OTHER DTC ON DISPLAY.
Yes No
!
CHECK ENGINE COOLING SYSTEM.
NOTE:
Check the following items.
*Thermostat open stuck
*Coolant level
Coolant freeze
*Tire diameter
Does the Subaru Select Moni-
I
Inspect DTC
I
Go to step 2.
tor or OBD-ll general scan tool
indicate DTC PO1 17 or PO1 18?
Is there a fault in engine cool-
ing system?
EN(D0HC TURBO)-141
PO1 17 or PO1 18
using "List of Diag.
nostic Trouble
Code (DTC)".
<Ref. to EN(D0HC
TURBO)-80, List
of Diagnostic Trow
ble Code (DTC).>
NOTE:
In this case, it is
not necessary tc
inspect DTC
PO1 25.
Replace the ther- rleplace the
mostat. <Ref. to engine coolant
CO-35, Thermo- temperature sen-
stat.> sor. <Ref. to
FU(D0HC
Engine Coolant
Temperature Sen-
sor.>
TURBO)-29,