Fuel Tank Pressure Sensor

Fuel Tank Pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The PCM provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the Powertrain Control Module (PCM) that can vary between 0.1-4.9 volts. As FTP increases, FTP sensor voltage decreases, high pressure - low voltage. As FTP decreases, FTP voltage increases, low pressure or vacuum - high voltage.