Workshop

FORD 5R55N

When in the Park position, there is no power flow
through the transmission and the parking pawl locks
the output shaft to the case. The engine may be started
and the key may be removed.
When in the Neutral position, there is no power flow
through the transmission, the output shaft is not held
and is free to turn. The engine may be started and the
key can not be removed.
When in the D5 position, there will be automatic
upshifts 1st through 5th gear, automatic downshifts
5th through 1st gear, and apply and release of the TCC
depending on vehicle speed, throttle position and
engine coolant temperature. This is the normal
position for most forward driving and provides the
maximum fuel economy during normal operation.
This unit also has engine braking in 5th gear.
When in the D4 position, there will be automatic
upshifts 1st through 4th gear, automatic downshifts
4th through 1st gear, and apply and release of the TCC
depending on vehicle speed, throttle position and
engine coolant temperature. This position may be
selected for towing, or driving in hilly terrain. This
unit also has engine braking in 4th gear.
When in the 3 position, there will be 3rd gear starts
and 3rd gear hold, no upshifts nor downshifts.
The TCC may apply or release depending on vehicle
speed, throttle position and engine coolant
temperature. This position is best suited for engine
braking in hilly terrain, or for improved traction on
slippery roads.
When in the 2 position, there will be 2nd gear starts
and 2nd gear hold, no upshifts nor downshift.
The TCC may apply or release depending on vehicle
speed, throttle position and engine coolant
temperature. This position is best suited for engine
braking in hilly terrain, or for improved traction on
slippery roads.
This position provides 1st gear operation only, and
used for descending steep grades. If this position is
selected at normal road speeds, the transmission will
downshift to the next lower gear, and continue
downshifting at safe pre-calibrated road speeds until
it reaches 1st gear.
When in the Reverse position, the vehicle may be
operated in a rearward direction at a reduced gear
ratio, and the back-up lamps are illuminated.
AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
9
Copyright © 2001 ATSG
REVERSE PRESSURE (RP) SWITCH
INSTRUMENT PANEL RANGE SELECTOR INDICATOR
MANUAL SHIFT SELECTOR
The Reverse Pressure (RP) switch, wired into the
solenoid body and bolted on the main valve body, is a
simple open or closed switch used to determine the
presence of pressure in the reverse circuit. The PCM
uses this information for appropriate pressure
requirements. When pressure is not present the
switch is open, and when pressure is present the
switch is closed.
The indicator is an electronic readout in the
instrument cluster which will match the position of
the range selector (P, R, N, D5, D4, 3, 2, 1). There is a
Park Sense Switch incorporated in the shifters that
prevents the PRNDL from displaying "P" until the
shifter is fully in the Park position.
In the event that an error in the range selector
occurs, an "E" for error will be displayed on the
instrument panel.
"P" = Park
"N" = Neutral
"D5" = Overdrive
"D4" = Overdrive Canceled
"3" = 3rd Gear (Base Shifter)
"2" = 2nd Gear (Base Shifter)
"1" = 1st Gear (Base Shifter)
"R" = Reverse
Special Note: Refer to Figure 5 for illustrations of
the Basic, and Optional, Manual Range Shifters.

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