Transmission - Monaco 2002 Diplomat Service 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 (keypad) 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 RPM during a
shift to an established desired profile within the ECU.
The system is monitored within the first 30 seconds of each engine start.
This is referred to as "autodetect." Autodetect searches for presence of data
inputs or transmission components. The autodetect enables the ECU
functional or diagnostic response to the items which 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 in shifting under varied conditions will be required
before optimizing the shift quality. Generally, five typical shifts of a shift
type is needed for shift calibration.
The range selection is accomplished via the remote pushbutton selector.
The selector is simplistic in appearance. The controls are R, N, D, arrow UP,
arrow DOWN, MODE buttons and a digital display window. Under normal
operations the "D" button is pressed and the digital display shows the highest
forward range attainable for the 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 this display indication is not visible, there is no power to the selector and
may indicate electrical problems with the batteries.
• Digital display window enables information requested to be
easily read.
• Select the REVERSE gear by pressing "R".
• Select NEUTRAL by pressing "N". The area around the "N"
button is 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 on the SELECT display and the transmission will shift
to the starting gear.
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D I P L O M A T
Chassis Information

TRANSMISSION

- Shift Selector
OM080310.epss
1 0 • 2 9 1