RAM 3500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1998)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
ENGINE COOLANT TEMPERATURE (ECT) SENSOR-ECM INPUT
Engine Coolant Temperature Sensor
The engine coolant temperature sensor is installed into the front of the cylinder head near to the thermostat housing and protrudes into a water
jacket. The sensor provides an input voltage to the Engine Control Module (ECM) to monitor coolant temperature. The ECM uses this input along
with inputs from other sensors for engine protection, fuel timing and fuel control. As coolant temperature varies, the coolant temperature sensor
resistance will change. This change in resistance results in a different input voltage to the ECM.