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. High temperature will result in a low signal voltage. DTC will set when PCM sees an excessively low ECT sensor voltage signal.
Conditions required to set DTC are
- Engine running greater than 15 seconds.
- ECT greater than 274°F (134°C).
- Listed conditions present for at least 25 seconds.