The Nissan 240SX Coolant Temperature Sensor tracks the temperature of the engine coolant and sends that information to the engine control module for proper engine operation. This Coolant Temperature Sensor threads straight into the Nissan 240SX engine's coolant passage, allowing it to be immersed in coolant so it can read heat. This component functions as a negative temperature coefficient (NTC) thermistor that reduces electrical resistance with a rise in temperature, thereby permitting a steady 5-volt reference from the ECM returning at varying voltages corresponding to specific degrees. Through the use of this information, the computer can enrich the fuel mixture for cold starts, raise idle speed to prevent stalling, and command the electric cooling fan for airflow when needed. The Coolant Temperature Sensor provides essential feedback to the control unit, allowing the activation of systems such as EGR, evaporative purge, and torque converter clutch only once a safe operating warmth is achieved. As the Coolant Temperature Sensor is a low current sensor, devices that draw high current, such as the radiator fan, are turned on by relays. This protects the Nissan electrical circuits. As a result, the Coolant Temperature Sensor reliably controls 240SX temperature under all Nissan 240SX driving conditions.
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