Hyundai Elantra HD: Fuel Tank Pressure Sensor (FTPS). Description and Operation
Function And Operation Priciple
The evaporative emission control system prevents hydrocarbon vapors from
escaping from the fuel tank into the atmosphere where they could form photochemical
smog. Gasoline vapors are collected in the charcoal canister. The Fuel Tank
Pressure Sensor (FTPS) is installed on the canister and is an integral part
of the evaporative monitoring system. The PCM monitors the FTPS signal to detect
vacuum decay and excess vacuum. The FTPS measures the difference between the
air pressure inside the fuel tank and outside air pressure to check the purge
control solenoid valve operation and for leak detection in the evaporative emission
control system by monitoring pressure and vacuum levels in the fuel tank during
the purge control solenoid valve operating cycles.
