Datsun 1980 200SX Service Manual page 551

ELECTRICAL SYSTEM
Automatic Speed Control Device
A S C D
Cruise light
illuminates when
speed
setting operation
i made
but
peed
is not actually
set
When
battery voltage
12V is applied to
the release valve terminal the
following
are
possible
1
With
A
closed
no
suction is possible at B
2 With A
opened
suction is
begun at
B
YES
to
Faulty
release valve
It
Servo
valve operates normally Refer
to Servo Valve
for Inspection
YES
1
NO
Faulty
servo
valve
Actuator
operates smoothly
when actuator
vacuum
port
is suctioned TItis
operation must be
performed
with A S C D cable released
YES
1
Faulty
controller
l N O
Faulty
actuator
tl
LL
I
LJ
A
To servo
valve
1
I
To actuator
B
BE089D
EL 97