Grand Caravan V6-3.3L VIN R (2005)
Evaporative Emission Control Canister: Description and Operation
Front EVAP Canister
Rear EVAP Canister
There are 2 EVAP canisters on the vehicle. The vacuum and vapor tubes connect to the top of the canister. It is a charcoal canister.
All vehicles use a maintenance free, evaporative (EVAP) canister. Fuel tank vapors vent into the canister. The canister temporarily holds the fuel vapors
until intake manifold vacuum draws them into the combustion chamber. The Powertrain Control Module (PCM) purges the canister through the
proportional purge solenoid. The PCM purges the canister at predetermined intervals and engine conditions.
Purge Free Cells
Purge-free memory cells are used to identify the fuel vapor content of the evaporative canister. Since the evaporative canister is not purged 100% of the
time, the PCM stores information about the evaporative canister s vapor content in a memory cell.
