Grand Caravan V6-3.3L VIN E Flex Fuel (2007)
Evaporative Emission Control Canister: Description and Operation
Operation
OPERATION
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 Linear
Purge Valve. 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.
The purge-free cells are constructed similar to certain purge-normal cells. The purge-free cells can be monitored by the scan tool. The only difference
between the purge-free cells and normal adaptive cells is that in purge-free, the purge is completely turned off. This gives the PCM the ability to compare
purge and purge-free operation.