The basic Evaporative Emission (EVAP) Control system used on these vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is running, the fuel vapor is purged from the carbon element by the intake air flow and consumed in the normal combustion process.
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). Poor idle, stalling and poor driveability can be caused by: a malfunctioning purge solenoid, a damaged canister; hoses and lines split, cracked or not connected properly (perhaps after rear end collision body work to the vehicle).
The evaporative canister is not a serviceable unit. If found to be defective, replace the entire unit. On all of these vehicles, the EVAP canister is located in the wheel well behind the driver's side rear wheel. The canister and valve can be serviced only by replacement. For further information, please see .