Subaru Impreza 2003 Service Manual page 3067

7. CHECK ENGINE COOLANT TEMPERATURE SENSOR
Step
1 CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
Check the engine coolant temperature sensor.
<Ref. to EN(H4SO)-2, Basic Diagnostic Proce-
dure.> or <Ref. to EN(H4SOw/oOBD)-2, Basic
Diagnostic Procedure.> or <Ref. to
EN(H4DOTC)-2, Basic Diagnostic Procedure.>
2 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
COMBINATION METER.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from engine cool-
ant temperature sensor and combination
meter.
3)Measure the resistance between engine
coolant temperature sensor harness connector
and combination meter harness connector.
Connector & terminal
(E8) No. 3 — (i12) No. 9:
COMBINATION METER SYSTEM
Is the engine coolant tempera-
ture sensor OK?
Is the resistance less than 10
Ω?
IDI-11
INSTRUMENTATION/DRIVER INFO
Check
Go to step 2.
Check the water
temperature
gauge. <Ref. to
IDI-21,
REMOVAL, Water
Temperature
Gauge.>
Yes No
Replace the
engine coolant
temperature sen-
sor.
Repair the wiring
harness.