DTC P0118 - ECT SENSOR CIRCUIT HIGH VOLTAGE Oldsmobile Cutlass VI

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

1. Engine running longer than 3 seconds.
2. ECT less than 9°F (-13°C).
3. Conditions present for up to 25 seconds.