Subaru LEGACY 2006 Manual page 170

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
Measure the resistance between engine cool-
ant temperature sensor terminals when the
engine coolant is cold and after warmed-up.
Terminals
No. 1 — No. 2:
Check
Is any other DTC displayed?
Is the resistance of engine
coolant temperature sensor dif-
ferent between when engine
coolant is cold and after
warmed-up?
EN(H4SO)(diag)-133
ENGINE (DIAGNOSTICS)
Yes No
Check the appro- Go to step 2.
priate DTC using
the "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
Contact your SOA Replace the
Service Center. engine coolant
temperature sen-
sor. <Ref. to
FU(H4SO)-19,
Engine Coolant
Temperature Sen-
sor.>