Fuel Tank Pressure Sensor: Description and Operation
FUEL TANK PRESSURE SENSORThe FTP sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary between 0.1-4.9 volts.
The table illustrates the relationship between the FTP sensor signal voltage and the EVAP system pressure/vacuum.