Ford Aerostar (1997 year). Manual — part 42
168
Steering Your Vehicle
Your vehicle comes with power steering. Power
steering uses energy from the engine to help
steer your vehicle.
If the amount of effort needed to steer your
vehicle changes at a constant vehicle speed, have
the power steering system checked. If the power
steering system breaks down (or if the engine is
turned off), you can steer the vehicle manually
but it takes more effort.
Never hold the steering wheel to the extreme
right or left for more than five seconds if the
engine is running. This can damage the power
steering pump.
NOTE:
After any severe impact such as
striking large potholes, sliding into
curbs on icy roads, or a collision
involving the front end, observe the
steering wheel alignment. If the spokes
of the steering wheel seem to be in a
different position while going straight
down the road, have the front
suspension and steering checked for
possible damage.
Automatic Transmission
Operation (4R44E/5R55E)
If your vehicle is equipped with an automatic
transmission, it will be either a four speed
overdrive transmission (4R44E) or a five speed
overdrive transmission (5R55E). All 3.0L engines
use the 4R44E transmission, while all 4.0L
engines use the 5R55E transmission. Both
transmission types have a lockup torque
converter. Transmission operation is controlled
by the Powertrain Control Module (PCM).
169
The PCM will automatically adjust transmission
operation to make up for varying conditions.
Several sensors located on the engine and
transmission such as throttle position, engine
speed, vehicle speed and transmission
temperature are used by the PCM to shift the
transmission into a higher or lower gear when
required for the best performance and fuel
economy. For example, you may notice that the
transmission will upshift to a higher gear more
quickly when the vehicle has not reached normal
operating temperature.
The PCM also controls the transmission’s Torque
Converter Clutch (TCC) to further raise vehicle
performance and fuel economy. The TCC will
engage when the transmission operating
temperature and other conditions determined by
the PCM have been met. Engagement of the
clutch may be noted as a decrease in engine
speed.
To help in troubleshooting, the PCM continually
performs self-tests on the electronic control
system and, if any faults are detected, stores
them in memory. The Transmission Control
Indicator Light (TCIL) (O/D OFF), which is
located on the gearshift lever, may flash steadily
if a malfunction has been detected. If the TCIL is
flashing, contact your Ford dealer as soon as
possible. If this condition persists, damage to the
transmission could occur.
Speed limiter
All models are equipped with a Powertrain
Control Module (PCM) which limits the
maximum engine speed and thus road speed in
top gear. Vehicle operation is normal since the
controlled maximum speed is above posted
highway speeds in North America.
170
Power Braking
Increasing the engine speed above idle without
vehicle movement (such as holding the brake) in
a forward or reverse gear causes transmission
stall.
NOTE:
Continued operation in the stall
condition can result in transmission
overheat, malfunction or fluid
expulsion.
Automatic Overdrive
Transmission
Putting Your Vehicle in Gear
Your vehicle’s gearshift is on the steering
column. The transmission control switch is
located on the end of the gearshift lever. You
can put the gearshift in any one of several
positions.
The positions of the column-mounted gearshift
171
R
WARNING
Hold the brake pedal down while you
move the gearshift lever from position to
position. If you do not hold the brake
pedal down, your vehicle may move
unexpectedly and injure someone.
Once you place the gearshift securely into
position, gradually release the brake pedal and
use the accelerator as necessary.
NOTE:
Your vehicle is equipped with a
brake-shift interlock feature. This
feature prevents you from shifting
from P (Park) unless you have the
brake pedal depressed. (The ignition
must be in the ON position.) If you
cannot shift from P (Park) with the
brake pedal depressed:
1.
Apply the parking brake.
2.
Remove the key.
3.
Insert the key and rotate it one position
clockwise (ignition in the OFF position).
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