VAPOR CANISTER
DESCRIPTION
All vehicles use a sealed, maintenance free, char-
coal filled EVAP canister. The canister mounts to fuel
tank with the LDP attached to it.
OPERATION
All vehicles use a maintenance free, evaporative
(EVAP) canister. Fuel tank vapors vent into the can-
ister. 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 pre-
determined 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 evapora-
tive canister’s vapor content in a memory cell.
The purge-free cells are constructed similar to cer-
tain purge-normal cells. The purge-free cells can be
monitored by the DRB IIIt Scan Tool. The only dif-
ference between the purge-free cells and normal
adaptive cells is that in purge-free, the purge is com-
pletely turned off. This gives the PCM the ability to
compare purge and purge-free operation.
REMOVAL
NOTE: The trunk panel (Fig. 13) will have to be cut
to remove the EVAP canister.
(1) Disconnect the negative battery cable.
(2) Put access panel in place and scribe the outline
of the panel. Mark the hole for the rivet that hold the
panel in place.
(3) Cut closeout panel hole for fuel tank and
remove panel (Fig. 14).
(4) Drill holes (11 holes).
Fig. 13 TRUNK PANEL
Fig. 14 CUTTING PANEL
25 - 16 EVAPORATIVE EMISSIONS ZB
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