Trooper (4 Door) V6-3165cc 3.2L DOHC (6VD1) (1992)
Engine Temperature Sensor: Description and Operation
Engine Coolant Temperature Sensor
ECT Sensor
PURPOSE
Provides engine temperature information to the Engine Control Module (ECM).
LOCATION
Rear of engine.
OPERATION
The ECM supplies a 5V signal to the sensor and measures voltage variation. By measuring this variation, the ECM measures coolant temperature.
This input is a factor in calculations involving most ECM controlled systems.
CONSTRUCTION
The coolant temperature sensor is a thermistor (a device whose resistance changes with temperature) mounted in the engine cooling system. Low
temperature produces high resistance (100K ohms at -40°C / -40°F) while high temperature produces low resistance (70 ohms at 130°C / 266°F).