The Nissan Sentra Vapor Pressure Sensor prevents fuel vapors from escaping into the air by allowing the engine computer to verify that the EVAP system is sealed and balanced. Situated close to the fuel tank, this Vapor Pressure Sensor measures minute alterations in the vacuum of the tank while the purge valve draws vapors through the charcoal canister. Furthermore, it sends this information to the ECM almost instantaneously, allowing the module to either continue drawing vapors or indicate a leak to the driver. The early models of the Sentra utilized a basic analog Vapor Pressure Sensor that simply provided pressure readings. Later models changed to a digital three-wire style. This enabled a faster and more accurate response to the on-board diagnostics II self-test. The three wires on the digital sensor are a five-volt reference, a signal, and a ground. The variation lies mainly in the resolution and wiring of the two sensors. The new version translates minor pressure swings of the vehicle into cleaner voltage steps. Consequently, this allows stricter monitoring of emissions without necessitating the redesign of the rest of the EVAP plumbing. If the Vapor Pressure Sensor drifts out of range, the dashboard light may glow even with the Nissan fuel cap tight. The Vapor Pressure Sensor in every Sentra is calibrated for the tank volume, unlike the pressure switches in vehicles. Consistent driving keeps the Nissan Vapor Pressure Sensor clear of moisture buildup.
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