Subaru IMPREZA GD 2007 Series Manual page 1451

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 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 the resistance of engine cool-
ant temperature sensor differ-
ent between when engine
coolant is cold and after
warmed-up?
EN(STI)(diag)-120
Yes No
Repair poor con- Replace the
tact of the ECM engine coolant
connector. temperature sen-
sor. <Ref. to
FU(H4DOTC)-30,
Engine Coolant
Temperature Sen-
sor.>