Fuel Tank Pressure Sensor: Description and Operation

Fuel Tank Pressure (FTP) Sensor:

PURPOSE
The Fuel Tank Pressure (FTP) sensor (A) is used to monitor the fuel tank pressure or vacuum during the OBD II purge monitor test of the Evaporative Emission System for Running Loss vehicles (passenger cars with fuel vapor control valves and trucks with fuel vapor valves). This monitor also performs a fuel system integrity check to determine if there is an evaporative emission system leak. Variations in pressure will be converted into an analog voltage input signal to the PCM.