Subaru 2002 Impreza Service Manual page 70

SENSORS AND SWITCHES
Fuel Injection (Fuel System)
C: ENGINE COOLANT TEMPERATURE SENSOR
The engine coolant temperature sensor is located on the engine coolant pipe. The sensor uses
a thermistor whose resistance changes inversely with temperature. Resistance signals as engine
coolant temperature information are transmitted to the ECM to make fuel injection, ignition timing,
purge control solenoid valve and other controls.
I Temp.
"C
( O F )
1 '
-20 0
20
40 60 80
(-4) (32) (68) (104)(140)(176)
U
S2H1113B
(1) Connector (2) Thermistor element
D: EXHAUST GAS TEMPERATURE SENSOR
The exhaust gas temperature sensor is located on the joint pipe and used to monitor the condition
of the precatalytic converter.
FU-20