PT Cruiser L4-2.4L Turbo (2009)
Engine - Coolant Temperature Sensor/Switch: Description and Operation
Engine Coolant Temperature Sensor - Operation
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 ECT sensor input is also used for temperature
gauge operation.
