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Section 10 — cHaSSiS information
camelot 2007
tranSmISSIon
The Allison World transmission incorporates
the
World Transmission Electronic Control
(WTEC)
system. The system is compromised
of five major components connected by a
wiring harness: the Electronic Control Unit
(ECU), engine throttle position sensor, three
speed sensors, remote shift selector (keypad)
and the control module. The ECU processes
information received from the throttle position
sensor, speed sensor, pressure switch and shift
selector to provide optimum shift quality. This
is accomplished by matching transmission and
engine RPM during a shift to establish a desired
shift profile within the ECU. Another feature
of the transmission is the ability to “learn” or
“adapt.” The electronic control system optimizes
shift quality by using “Adaptive Shifting.”
A wide variety of varied shift conditions
is required before optimizing shift quality.
Generally, five typical shifts of a consistent shift
type are needed to optimize shift quality.
Shift Selector
The keypads on the shift control are
R
(Reverse),
N
(Neutral),
D
(Drive), Arrow
up, Arrow down, Mode button. A digital
display window shows gear selection, various
transmission modes, oil level and transmission
fault codes. Generation 4 keypads have a split
screen displaying two number sets while in
drive. The left number displays the highest
forward range available. The right number is
the range that the transmission is currently in.
NN
(Neutral) will appear in the display window
when the ignition is turned On. This indicates
the transmission is in neutral and it is safe to
start the crank. If the
NN
does not display when
the ignition is turned on, there is no power to the
shift selector and the transmission will not allow
the engine to start. No display is an indicator of
electrical problems with the engine batteries,
ECU or the shift selector.
Keypad Functions:
Select the Reverse gear by pressing
R
.
RR will display.
Select Neutral by pressing
N
. The area
around the
N
button has a raised ridge so
the driver can orient his hand to the push
buttons by touch without looking at the
display.
Select Drive range by pressing
D
. The
highest forward gear (6th gear) appears
in the display and the transmission will
shift to first gear indicated as 6 1.
The Up and Down arrow buttons are
used to select a higher (if not in “6”)
or lower (if not in “1”) forward range.
These buttons are not functional in
Neutral or Reverse.
When in Drive, one press changes the
gear range selected by one. If the button
is held continuously, the selected range
will continue to change up or down
until the button is released or until the
highest/lowest possible range of gears is
selected.
The Mode button enables a secondary
shift point to be selected. This is
commonly referred to as Economy
mode. Economy mode affects the upshift
schedule 3-4, 4-5, 5-6 and downshift
schedule 6-5, 5-4, 4-3. During highway
driving, with the cruise control set
between 55 and 65 m.p.h., setting the
transmission to economy mode will
eliminate about 99% of transmission
downshifts from sixth to fifth when
incurring a slight incline or overpass.
CAUTION
Do not use Economy Mode in heavy
stop and go traffic or mountainous
terrains. Frequent shifting while using
heavy throttle occurs in Economy
Mode and increases transmission fluid
temperature. Exit Economy Mode until
road conditions improve.
NOTE
The Mode button is used by the service
technician to access diagnostic codes
when troubleshooting. The diagnostic
circuitry must be enabled to display.
CAUTION
Engine temperature may rise when
ascending long grades using full throttle.
Towing a load will increase the demand
on the engine. If this occurs, manually
shift the transmission to the next lower
gear and use less throttle.
The engine will use less fuel and RPM
should increase.
NOTE
The transmission will not accept a
manually selected gear change to occur
if the gear selected is out of the specified
operating range.
Summary of Contents for Camelot 2007
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Page 49: ...45 Section 2 Driving Safety Camelot 2007 Weight Record Sheet Actual Worksheet 020255b...
Page 53: ...49 Section 2 Driving Safety Camelot 2007 Weighing Procedure Worksheet 020255c...
Page 106: ...appliances 4 102 Camelot 2007 Notes...
Page 140: ...Section 5 Equipment 136 camelot 2007 Notes...
Page 155: ...151 Section 6 water systems camelot 2007 Water service center Typical Water System...
Page 156: ...Section 6 water systems 152 camelot 2007 Notes...
Page 186: ...Section 8 Electrical Systems House 182 camelot 2007 Notes...
Page 202: ...Section 9 Electrical Systems Chassis 198 camelot 2007 engine no start flow chart...
Page 244: ...Section 10 chassis information 240 camelot 2007 42 Tag Axle Models 070171i 070171j...
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