Datsun C210 series Manual page 477

VACUUM SYSTEM
1i
Intake manifold
The vacuum system
consists
of
a
fast idle control device and
an
air
intake door
actuator
The fast idle
control device
increases
the engine idle
speed allowing
the air conditioner
to
continue
cooling the passenger
com
partment even
when the
car
is stopped
The
air
intake door
actuator
serves
to
open
the air intake door
FAST IDLE
I
ROL
The fast idle control device
consists
of
a
vacuum
switch and
a
fast idle
Air
Conditioning
Boost meter
J
Vacuum Iwitch
L
actuator
They
are
assembled
as one
unit
Vacuum switch
Magnet vein
While the
vacuum
switch coil is
energiZed by
n
lectric
current
vacuum
is
imposed
on
the fast idle
actuator side
When
current to
the coil
is inter
rupted
passage
on
the 4
way
con
nector side closes
leaving
the fast idle
actuator
side open to
the
atmosphere
AC 6
ni
Air intake
door
solenoid
Air intake door
actuator
AC236A
Fig AC 6 Vacuum Syttem
Fast Idle actuator
The device
is
a vacuum
actuator
and is equipped
with
a
diaphragm The
diaphragm
deflects when
vac 1um
pres
sure
is
applied
and
as 3
result
the
operating
lever attached to it is moved
The operating lever
is
connected with
the carburetor throttle lever
When
the
vacuum
pressure
acting
on
the
diaphragm
is
lost the
diaphragm
is
returned to its
original
position