SRT-4 L4-2.4L Turbo VIN S (2004)
Evaporative Emission Control Canister: Description and Operation
EVAP Canister
The vacuum and vapor tubes connect to the top of the 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.
The purge-free cells are constructed similar to certain purge-normal cells. The purge-free cells can be monitored by the DRB III(R) 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.
