Stratus Sedan V6-2.7L VIN R (2002)
Engine Coolant Temperature (ECT) Sensor: Description and Operation
DESCRIPTION
2.0L12.4L ENGINE
The Engine Coolant Temperature (ECT) Sensor threads into the thermostat housing just below the coolant outlet connector. The ECT Sensor is a
negative thermal coefficient sensor.
2.7L ENGINE
The Engine Coolant Temperature (ECT) Sensor threads into the coolant outlet connector. The ECT Sensor is a negative thermal coefficient sensor.
OPERATION
The ECT sensor provides an input to the PCM. As temperature increases, resistance of the sensor decreases. As coolant temperature varies, the ECT
sensor resistance changes resulting in a different voltage value at the PCM ECT sensor signal circuit. The ECT sensor provides input for various PCM
operations. The PCM uses the input to control air fuel mixture, timing, and radiator fan on/off times. The PCM uses ECT sensor input to send
messages over the PCI bus to various modules for other functions such as temperature gauge and AC operation.
