Engine Coolant Temperature Gage

The instrument cluster receives engine coolant temperature information from the powertrain control module (PCM) via the serial data bus normal mode message. The PCM receives engine coolant temperature information from the engine coolant temperature (ECT) Sensor. The ECT Sensor is a thermistor mounted in the engine coolant stream. Low engine coolant temperature produces a high sensor resistance, while high engine coolant temperature causes a low sensor resistance.