Vibe FWD L4-1.8L VIN L (2005)
Fuel Tank Pressure Sensor: Description and Operation
FUEL TANK PRESSURE (FTP) SENSOR
The fuel tank pressure (FTP) sensor, measures the difference between the fuel tank and outside air pressure. The FTP sensor is an integral part of the
EVAP vacuum leak pump assembly. The PCM provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage
back to the PCM that can vary between 0.1 and 4.9 volts. As the fuel tank pressure increases, the FTP sensor voltage decreases, as the fuel tank pressure
decreases the FTP sensor voltage increases. High pressure = high voltage. Low pressure vacuum = low voltage.
