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Home >> Chrysler >> 2012 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (6.4L - DTCS P000B To P0201) >> Diagnosis And Testing >> P0117-Engine Coolant Temperature Sensor Circuit Low >> Theory Of Operation

Theory Of Operation

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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.

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