Datsun 1980 200SX Service Manual page 96

After start
enrichment
When
the ignition
switch
is
turned
from the START to
ON
position
after
cranking operation
the
start
or
cold
start
enrichment
becomes
zero
The after
start
enrichment is
provided
to
compensate
for
this
sudden decrease in fuel
quantity
The
after
start
enrichment
decreases
gradually
as
time
passes
finally be
coming
zero
and is
detennined by
cooling
water temperature
Idle
enrichment
When the
engine
is
idling
that is
when the accelerator
pedal is
not
depressed the throttle
valve switch
idle
contact is
ON
to
provide
ad
ditional fuel injection
After Idle enrichment
The after idle
enrichment
pro
vides
smooth
acceleration
when the
ac
celerator pedal
is
depressed
to start the
vehicle
The after
idle enrichment
de
creases
gradually
as
time passes
finally
becoming
zero
and
is
detennined
by
cooling
water
temperature
ENGINE FUEL
Fuellnjection Control
Full enrichment
The
smooth
ance
full
enrichment provides
full throttle
driving
perfonn
California models
The full enrichment
is activated
when the intake manifold
vacuum
is
below 21 3
kPa
160
mmHg
6 3 0
inHg
or
when the throttle valve open
ing
is
more
than
450
Non California
models
The full enrichment
is
activated
when
the
throttle valve opening
is
more
than
450
ENRICHMENT
SIGNAL
AND
SIGNAL SOURCE
CHART
Throttle
valve switch
I
Vacuum
Ignition
Water Air
Ignition
Full
witch
switch
coil
Remarks
tempera tempera
Idle California negative
Fuel
ture
sensor
ture
sensor
throttle START
enrichment
contact
contact
models
terminal
Cold
start
0 0 0
Start
0
After start
0
0 1
1
Ignition
switch
START ON
Idle
0
After idle 0 0
2
2 Idle contact
ON OFF
Full
0 0
Warm
up
0
0
Intake air
0
temperature
EF 9