Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 750
DIAGNOSIS AND TESTING - VEHICLE DOES
NOT FILL
CONDITION
POSSIBLE CAUSES
CORRECTION
Pre-Mature Nozzle Shut-Off
Defective fuel tank assembly
components.
Fill tube improperly installed
(sump)
Fill tube hose pinched.
Check valve stuck shut.
Control valve stuck shut.
Defective vapor/vent components.
Vent line from control valve to
canister pinched.
Vent line from canister to vent
filter pinched.
Canister vent valve failure
(requires double failure,
plugged to NVLD and
atmosphere).
Leak detection pump failed
closed.
Leak detection pump filter
plugged.
On-Board diagnostics evaporative
system leak test just conducted.
Canister vent valve vent
plugged to atmosphere.
Engine still running when
attempting to fill (System
designed not to fill).
Defective fill nozzle.
Try another nozzle.
Fuel Spits Out Of Filler
Tube.
During fill.
See Pre-Mature Shut-Off.
At conclusion of fill.
Defective fuel handling
component. (Check valve stuck
open).
Defective vapor/vent handling
component.
Defective fill nozzle.
JR
EVAPORATIVE EMISSIONS
25 - 17
ORVR (Continued)
PCV VALVE
DESCRIPTION
The PCV valve contains a spring loaded plunger.
The plunger meters the amount of crankcase vapors
routed into the combustion chamber based on intake
manifold vacuum (Fig. 8).
OPERATION
When the engine is not operating or during an
engine backfire, the spring forces the plunger back
against the seat. This prevents vapors from flowing
through the valve (Fig. 9).
When the engine is at idle or cruising, high mani-
fold vacuum is present. At these times manifold vac-
uum is able to completely compress the spring and
pull the plunger to the top of the valve (Fig. 10). In
this position there is minimal vapor flow through the
valve.
During periods of moderate intake manifold vac-
uum the plunger is only pulled part way back from
the inlet. This results in maximum vapor flow
through the valve (Fig. 11).
DIAGNOSIS AND TESTING - PCV SYSTEM
WARNING:
APPLY
PARKING
BRAKE
AND/OR
BLOCK WHEELS BEFORE PERFORMING ANY TEST
OR ADJUSTMENT WITH THE ENGINE OPERATING.
(1) With engine idling, remove the hose from the
PCV valve. If the valve is not plugged, a hissing
noise will be heard as air passes through the valve. A
strong vacuum should also be felt when a finger is
placed over the valve inlet.
(2) Install
hose
on
PCV
valve.
Remove
the
make-up air hose from the air plenum at the rear of
the engine. Hold a piece of stiff paper (parts tag)
loosely over the end of the make-up air hose.
(3) After allowing approximately one minute for
crankcase pressure to reduce, the paper should draw
up against the hose with noticeable force. If the
engine does not draw the paper against the grommet
after installing a new valve, replace the PCV valve
hose.
(4) Turn the engine off. Remove the PCV valve
from intake manifold. The valve should rattle when
shaken.
(5) Replace the PCV valve and retest the system if
it does not operate as described in the preceding
tests. Do not attempt to clean the old PCV valve.
Fig. 8 POSITIVE CRANKCASE VALVE
Fig. 9 Engine Off or Engine Backfire No Vapor Flow
Fig. 10 High Intake Manifold Vacuum Minimal Vapor
Flow
Fig. 11 Moderate Intake Manifold Vacuum Maximum
Vapor Flow
25 - 18
EVAPORATIVE EMISSIONS
JR
VAPOR CANISTER
DESCRIPTION
The canister attaches to the bracket. The vapor
tubes connect to the top of the canister (Fig. 12). It is
a charcoal canister.
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 III
t 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
(1) Disconnect the negative battery cable.
(2) Remove the fuel tank, refer to the fuel tank
removal in this section
(3) Disconnect the EVAP hoses from the EVAP can-
ister and the electrical connector (Fig. 13).
(4) Squeeze the lower tabs on the EVAP canister to
release it (Fig. 14).
Fig. 12 EVAP Canister
Fig. 13 EVAP CANISTER HOSES
Fig. 14 EVAP CANISTER BOTTOM TABS
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EVAPORATIVE EMISSIONS
25 - 19
(5) Swing the EVAP canister away from the lower
bracket.
(6) Lift the EVAP canister up and off the upper
mounting tab (Fig. 15) and (Fig. 16).
INSTALLATION
(1) Install the EVAP canister to the upper mount-
ing bracket (Fig. 15) and (Fig. 16).
(2) Swing EVAP canister into the lower mounting
and snap into place (Fig. 14).
(3) Install the hoses to the top of the EVAP canis-
ter (Fig. 13).
(4) Connect the electrical connector.
(5) Install the fuel tank, refer to the fuel tank
installation section
(6) Connect the negative battery cable.
Fig. 15 EVAP CANISTER TOP TAB
Fig. 16 EVAP CANISTER TOP MOUNTING
25 - 20
EVAPORATIVE EMISSIONS
JR
VAPOR CANISTER (Continued)
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