Cavalier L4-2.2L VIN F (2004)
Fuel Tank Pressure Sensor: Description and Operation
FUEL TANK PRESSURE SENSOR
The 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. As FTP increases, FTP sensor voltage decreases, high pressure = low voltage. As FTP decreases, FTP voltage increases, low pressure or
vacuum = high voltage.
