Evaporative Emission Control System Description (LC8)

Evaporative Emission Control System Description (LC8)

EVAP System Operation (LC8, FHZ)

The evaporative emission (EVAP) control system on a compressed natural gas (CNG) fueled vehicle has been disabled. Many of the components are removed with the exception of the EVAP purge solenoid valve. However, the EVAP purge solenoid valve does not purge fuel vapors. The vapor line port is capped. The EVAP purge solenoid valve is utilized with the ECM fuel calibration for CNG control. There are no DTCs associated with the EVAP purge solenoid valve. Scan tool support for EVAP control system has been removed as well.