Volvo S80 Coolant Temperature Sensor measures the engine coolant temperature to maintain a good performance and to avoid overheating. This element is screwed into the coolant passages to give real time information to the engine control module. The Volvo S80 Coolant Temperature Sensor is a typical thermistor which varies its electrical resistance depending on temperature changes. The engine control module takes a reference voltage of 5 volt to the sensor and compares it with the temperature of the return voltage. With this temperature data, the engine control module modulates fuel injection and ignition timing on Volvo S80. Another way the injector pulse width is varied in the module is to produce a richer mixture at colder engine temperatures and reducing the injector pulse width as the engine heats. Furthermore, the data from the Coolant Temperature Sensor enables the module to increase idle speed to prevent stalling in cold conditions and to turn the electric cooling fan on and off. Some component functions are activated at a warm operating temperature of the engine, such as the exhaust gas recirculation system, the evaporative emissions control purge valve, and the transmission torque converter clutch. The Volvo vehicle supports efficient performance in diverse driving conditions by giving precise temperature readings and cushions the engine against possible damage.
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