Escort L4-110 1.8L DOHC (1994)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Engine Coolant Temperature (ECT) Sensor
PURPOSE
The Engine Coolant Temperature (ECT) sensor constantly supplies the Powertrain Control Module (PCM) with a signal reflecting engine coolant
temperature.
OPERATION
The ECT is a negative temperature coefficient sensor. As coolant temperature increases, sensor resistance decreases, and vice versa. The PCM
reads varying sensor resistance and determines engine operating temperature. This information is used in calculations for air/fuel mixture, idle
speed, fuel pressure, purge flow, and ignition timing.
