Subaru 2002 IMPREZA Service Manual page 573

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODE (DTC) ON DISPLAY.
2 CHECK THERMOSTAT.
Check
Is any other DTC displayed?
Does thermostat remain
opened?
EN-141
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN-83, List of
Diagnostic Trou-
ble Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect P0125.
Replace the ther- Replace the
mostat. <Ref. to engine coolant
CO-37, Thermo- temperature sen-
stat.> sor. <Ref. to FU-
31, Engine Cool-
ant Temperature
Sensor.>
No