The Nissan Pathfinder Coolant Temperature Sensor determines engine coolant temperature and sends this information to the engine control module in real time. The sensor for coolant temperature is threaded into a coolant passage for direct measurement as circulating fluid contacts the sensing element. The device inside functions as an NTC thermistor that shrinks in resistance with increased temperature. The engine control module transmits a 5 volt reference signal. The Coolant Temperature Sensor in return transmits a voltage that changes with heat, allowing the computer to compute the temperature of the coolant. Using the aforementioned input, the module on a Nissan Pathfinder changes the pulse width of the injectors so that richer cold mixtures are produced, increases cold idle speed, and switches the electric cooling fan on. Temperature feedback also controls systems like exhaust gas recirculation, evaporative emission purge, and torque converter clutch engagement until adequate warmth is reached. The dashboard also receives accurate temperature readings from this Coolant Temperature Sensor input. The Coolant Temperature Sensor consistently delivers data that helps any Nissan Pathfinder maintain optimal engine performance and prevent overheating so that no Nissan Pathfinder driver ever has to worry about the Coolant Temperature Sensor.
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