Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .
Circuit Description
Engine Coolant Temperature (ECT) sensor is a thermistor that varies resistance based on temperature. As temperature of sensor increases, resistance decreases. Low temperature will result in a high signal voltage. DTC will set when PCM sees an excessively high ECT sensor voltage signal.
Conditions required to set DTC are
- Engine running greater than 3 seconds.
- ECT less than -36°F (-38°C).
- Conditions present for at least one minute.