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

GM
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    EVAP System Pressure Sensor Circuit Conditions
Cause:
    Engine running, VSS input over 10 mph for one minute, fuel tank level from 25-75%, then the PCM detected the Fuel Tank Pressure sensor input was under 0.5v or over 4.8v for 500 ms in the test.