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13 CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank.
2. Remove fuel filler tube and hose.
3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close.
SEF665U
Do not drop any material into the tank.
OK or NG
OK © INSPECTION END
NG © Replace fuel filler tube or replace one-way fuel valve with fuel tank.
SEF372Q
SEF559A
Positive Crankcase Ventilation
DESCRIPTION
NHEC0021
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to con-
duct crankcase blow-by gas to the intake manifold.
During partial throttle operation of the engine, the intake manifold
sucks the blow-by gas through the PCV valve.
Normally, the capacity of the valve is sufficient to handle any
blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the
crankcase. In this process the air passes through the hose con-
necting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to
draw the blow-by flow through the valve. The flow goes through the
hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all
conditions.
SEC137A
INSPECTION
NHEC0022
PCV (Positive Crankcase Ventilation) Valve
NHEC0022S01
With engine running at idle, remove PCV valve ventilation hose
from PCV valve; if the valve is working properly, a hissing noise will
be heard as air passes through it and a strong vacuum should be
felt immediately when a finger is placed over valve inlet.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
On Board Refueling Vapor Recovery (ORVR) (Cont’d)
EC-47
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