The Coolant Temperature Sensor will monitor the heat of the engine's coolant so that the engine control module can keep the combustion, idle, and cooling functions in the intended range. The sensor's tip is positioned in a coolant passage so that it can contact flowing coolant. The module uses an NTC thermistor that takes a 5-volt reference signal and returns a voltage that drops as the temperature goes up. The data is then converted to accurate values. Using data from the Coolant Temperature Sensor, the module increases injector pulse width for a richer mix when cold and then decreases it as the Nissan engine warms up. This lifts cold-start idle speed to prevent stalling and energizes the electric radiator fan. Feedback on temperature from the Coolant Temperature Sensor also determines when the EGR valve, purge valve, and torque converter clutch can activate. This is allowed only after it is safe to do so. The Coolant Temperature Sensor provides accurate readings to help each Nissan Xterra run smoothly, preventing overheating and maintaining Nissan's efficiency along the Xterra line. This also provides the temperature gauge for every Xterra to read. A failed Coolant Temperature Sensor can interfere with these controls.
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