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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 3.6L - DTCS P000A To P0155 >> Diagnosis And Testing >> P0117-Engine Coolant Temperature Sensor Circuit Low >> Theory Of Operation

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.

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