Transmission - Shift Selector - Holiday Navigator 2003 Owner's Manual

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 (key-
pad) and the control module. The ECU processes information received from
the throttle position sensor, speed sensor, pressure switch and shift selector to
activate solenoids on the control module in the transmission. The solenoids
control oncoming and off going clutch pressure to provide closed loop shift
control. This is accomplished by matching transmission and engine RPM
during a shift to establish a desired shift profile within the ECU.
The system is monitored for the first 30 seconds of each engine start. This
is referred to as "autodetect." Autodetect searches for presence of data inputs
of transmission components. Autodetect enables the ECU functions and
diagnostics to respond to items that are detected.
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 is needed to
optimize shift quality.
The range selection is accomplished via the remote push button selector.
The controls are R, N, D, arrow UP, arrow DOWN, MODE button and a digital
display window. Under normal operation press the D button and the digital
display shows the highest forward range attainable for shift selection in use.
The digital display window will also indicate codes for abnormal conditions,
and can even be a useful troubleshooting aid. When the ignition is turned ON,
the display should be visible. This display indicates the presence of neutral
start command. If the display indication is not visible, there is no power to the
selector and the transmission will not allow the engine to start. This is an
indicator of electrical problems with the engine batteries, ECU on shift selector
keypad.
The window displays gear selection, various transmission modes, oil level
and transmission fault codes.
Keypad Functions:
• Select the REVERSE gear by pressing R.
• 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
appears in the display and the transmission will shift to first gear
though 6 is displayed.
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N A V I G A T O R 2 0 0 3
Chassis Information
TRANSMISSION
- Shift Selector
080355c
1 0 • 4 3 1