Driving
163
[GF00900(R)05/96] Automatic Transmission Operation
(4R44E/5R55E)
[GF08715(R)05/96]
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 2.3L and 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).
*
[GF08720(R)01/96]
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.
*
[GF08730(R)01/96]
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.
[GF08740(R)05/96]
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
instrument cluster, 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.
File:09ungfr.ex
Update:Thu Mar 20 08:55:24 1997
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