The EVAP system contains the following components:
| • | The EVAP Fuel Vapor Canister. |
| • | The EVAP Purge Solenoid Valve. |
| • | The EVAP Fuel Tank Pressure sensor. |
| • | The fuel vapor and vent lines. |
The PCM will command the EVAP Purge Solenoid Valve ON to purge stored
fuel vapors from the EVAP Fuel Vapor Canister.The PCM will pulse width modulate
the ON-time of the solenoid in order to regulate the amount of fuel vapor
entering the engine. The PCM will enable purge during most driving conditions
including idle based upon sensor inputs. The PCM runs a comprehensive diagnostic
test of the EVAP system. A failure of the EVAP system will set a DTC. The
EVAP Vent Valve and the EVAP Fuel Tank Pressure sensor are needed by the PCM
to diagnose the EVAP system.
