DTC P1114 - ECT SENSOR CIRCUIT INTERMITTENT LOW VOLTAGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

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 VCM sees an ECT sensor voltage of less than 0.82 volt with engine running for 5 seconds.

Conditions for setting DTC

1. Engine run time greater than 5 seconds.
2. ECT less than 0.25 volt (low resistance pull-up).
3. ECT less than 0.25 volt (high resistance pull-up).