Ford
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    FTP Sensor Circuit Low Conditions
Cause:
    Key on or engine running, then the PCM detected an FTP sensor signal of less than 0.20v

Generic
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Evaporative Emission System Pressure Sensor/Switch Low

GM
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Fuel Tank Pressure Sensor Circuit Low Input Conditions
Cause:
    Key on or engine running, then the PCM detected that the Fuel Tank Pressure sensor signal was less than 0.1v for 5 seconds.

Nissan
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Evaporative emission (EVAP) canister purge system - pressure sensor malfunction
Cause:
    Wiring, EVAP pressure sensor, hose leak/blockage, EVAP vent/control valve, EVAP canister, ECM