Caravan L4-2.4L VIN B (2003)
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 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.
