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CS
ORVR (Continued)
DIAGNOSIS AND TESTING - VEHICLE DOES
NOT FILL
CONDITION
Pre-Mature Nozzle Shut-Off
Fuel Spits Out Of Filler
Tube.
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.
DIAGNOSIS AND TESTING - PCV SYSTEM
WARNING:
APPLY
BLOCK WHEELS BEFORE PERFORMING ANY TEST
OR ADJUSTMENT WITH THE ENGINE OPERATING.
POSSIBLE CAUSES
Defective fuel tank assembly
components.
Defective vapor/vent components.
On-Board diagnostics evaporative
system leak test just conducted.
Defective fill nozzle.
During fill.
At conclusion of fill.
PARKING
BRAKE
(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
AND/OR
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.
EVAPORATIVE EMISSIONS 25 - 11
CORRECTION
Fill tube improperly installed
(sump)
Fill tube hose pinched.
Check valve stuck shut.
Control valve stuck shut.
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.
Canister vent valve vent
plugged to atmosphere.
engine still running when
attempting to fill (System
designed not to fill).
Try another nozzle.
See Pre-Mature Shut-Off.
Defective fuel handling
component. (Check valve stuck
open).
Defective vapor/vent handling
component.
Defective fill nozzle.
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