14 - i
FUEL
SYSTEM
Fig.
11 Air
Temperature
Switch
•
The engine controller receives an
ignition
sense
in-
put.
It then powers up. Battery voltage is supplied
through
the battery voltage input.
•
The wait-to-start lamp is turned on by the engine
controller
for at
least
2
seconds
as a bulb
test.
•
The engine controller monitors the charge air tem-
perature
sensor
input. If
manifold
air temperature is
at or below 15°C
(59°F),
the engine controller
will
start the air intake
heater
preheat
cycle. It
will
en-
ergize the intake
heaters
by grounding the air intake
heater
relays. The engine controller
will
turn
the
wait-to-start
light
on
until
the
preheat
cycle is over.
If
the
engine
controller receives a
crank
signal
before the preheat cycle is over, it
will
abort the
preheat cycle.
•
The engine controller monitors battery voltage.
The intake
heater
preheat
cycle is adjusted
based
on
battery voltage.
@
The engine controller
will
turn
on the water-in-
fuel
lamp if a signal is received
from
the water-in-
fuel
sensor.
ENGINE
START-UP
When
the
ignition
key is put in the start position,
the
following
occurs:
©
The engine controller receives the crank signal in-
put
when the starter relay is energized.
©
The air intake
heaters
are not energized during
cranking.
•
The engine controller monitors battery voltage. If
battery voltage is above 12.66 volts the engine con-
troller
determines that the engine is running.
• If
the engine controller received a crank signal be-
fore
the
preheat
cycle was over, the
heaters
will
be
de-energized. However, the
post-heat
cycle
will
begin
if
battery voltage is above 12.66 volts and intake
manifold
temperature is below 15°C
(59°F).
ENGINE
WARM-UP
•
The engine controller may start the air intake
heater
post-heat
cycle depending on intake air tem-
perature. If
manifold
air temperature was at or be-
low
15°C
(59°F)
when the
ignition
switch was turned
on,
the cycle is started.
•
If intake
manifold
air temperature is below 12°C
(54°F),
the KSB solenoid
will
be energized through
the air temperature switch. The solenoid remains en-
ergized
until
the air temperature switch
opens.
The
switch
opens
when intake
manifold
air temperature
is
above 16°C
(60°F).
•
If the coolant temperature switch is open, the
transmission
will
not be allowed to enter overdrive
(automatic transmission). The switch
opens
when
coolant temperature is below 16°C
(60°F).
•
The engine controller
will
turn
on the water-in-
fuel
lamp if a signal is received
from
the water-in-
fuel
sensor.
CRUISS
OR
SOLE
•
The engine controller monitors intake
manifold
air
temperature through the charge temperature
sensor
input.
•
If intake
manifold
air temperature is below 12°C
(54°F),
the KSB solenoid
will
be energized through
the air temperature switch. The solenoid remains en-
ergized
until
the air temperature switch
opens.
The
switch
opens
when intake
manifold
air temperature
is
above 16°C
(60°F).
•
The air intake
heater
post-heat
cycle
will
be com-
pleted, if it is not already over.
©
The vehicle distance
(speed)
sensor
and throttle po-
sition
sensor
inputs are used to control transmission
overdrive
operation.
If
the coolant temperature switch is open, the
transmission
will
not be allowed to enter overdrive
(automatic transmission). The switch
opens
when
coolant temperature is below 16°C
(60°F).
•
If the transmission thermo-switch is open, the
transmission
will
not be allowed to enter into over-
drive
(automatic transmission). If the switch
opens
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