P0117-Engine Coolant Temperature Sensor Circuit Low: Notes
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For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .
Theory of operation
The Engine Coolant Temperature (ECT) Sensor is a variable resistor that measures the temperature of the engine coolant. The Powertrain Control Module (PCM) supplies 5 Volts to the ECT Signal circuit and supplies a ground to the low reference circuit.