DTC P0117 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT LOW VOLTAGE Chevrolet Tahoe I

Note. For circuit reference (Схема №9) For connector and terminal identification, see CONNECTOR IDENTIFICATION.

Circuit Description

Engine Coolant Temperature (ECT) sensor is a thermistor that controls a monitored signal voltage to PCM. When engine coolant is cool, sensor resistance will be high and PCM will sense a high voltage signal. When engine coolant is warm, sensor resistance will be low and PCM will sense a low voltage signal. Voltage measured across thermistor is interpreted as a temperature.

DTC will set when the following conditions are present

1. Engine coolant temperature is greater than or equal to 304°F (151°C) for 2 seconds.