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Home >> Chrysler >> 2012 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (3.6L - DTCS P000A To P0159) >> Diagnosis And Testing >> P0118-Engine Coolant Temperature Sensor Circuit High >> 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.