Home/Pontiac/Firebird/Pontiac Firebird IV (1993-2002)/Repair manual/Testing & Diagnostics/DTC P0117 - ECT SENSOR CIRCUIT LOW VOLTAGE

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Wiring diagrams Section: Testing & Diagnostics

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DTC P0117 - ECT SENSOR CIRCUIT LOW VOLTAGE Pontiac Firebird IV

Testing & Diagnostics

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 282°F (139°C).
Conditions present for at least 10 seconds.