Other Features
66
PRODRIVER™
PRODRIVER™ is an optional graphic device
similar to MCD but with added features. A
summary of data displays available from
PRODRIVER™ include:
• Instantaneous and average fuel
consumption rate;
• Trip time, miles driven, fuel used, , average
speed;
• Driving time, percentage, miles, fuel used,
fuel consumption rate;
• Idle time, percentage and fuel used;
• Cruise time, percentage, miles cruised, fuel
used, fuel consumption rate;
• Top gear time, percentage, miles driven,
fuel used, fuel consumption rate;
• Overspeed time and percentage for two
speed thresholds;
• Over-rev time and percentage;
• Maximum vehicle speed and RPM;
• Coasting time and percentage;
• Automated oil change interval tracking;
• Hard braking incident record;
• Driver initiated incident record;
Stop Engine and Check Engine code log.
ALLISON TRANSMISSION CONTROL
MODULE (TCM)
The TCM works with the Allison transmission
and with the push-button shift selector.
The Allison Transmission Electronic Controls
has three major elements: The Transmission
Control Module (TCM), speed sensors and the
transmission shift selector control pad. Refer to
Controls and Instruments chapter. These
components work together to electronically
control the functions of the transmission. The
throttle sensor, speed sensors and shift selector
transmit information to the TCM. The TCM
processes this information and then sends
signals to actuate specific solenoids located on
the control valve body in the transmission. The
action of the solenoids affects hydraulic circuits,
which in turn control the upshifts, downshifts,
and lock up functions. In addition to controlling
the operation of the transmission, the Allison
Transmission electronic controls monitor the
system for abnormal conditions.
When one of these conditions is detected, the
Allison electronic control system is programmed
to automatically respond in a manner which is
safe for the driver, the vehicle and the
transmission. The Allison electronic control
system turns ON the CHECK TRANSlight on the
dashboard, which serves as a fault indicator.
To enhance troubleshooting and to allow
interrogation of the TCM for valuable service
information, the shift selector display on the
transmission control pad or an optional
diagnostic tool can be used. For information
about reading and interpreting diagnostic codes,
refer to Technical Information chapter under
"Allison Transmission Diagnostic Trouble-
shooting Codes (DTC)".
ALLISON TRANSMISSION RETARDER
The transmission retarder is an optional device
that helps to reduce the speed of a vehicle. It
improves vehicle control, increases driving
safety and permits more economical operation.
The retarder provides slowing power when it is
most needed, such as when descending
mountain roads, in stop-and-go traffic and on
crowded freeways.
The transmission retarder is a vehicle-slowing
device, not a vehicle-stopping device. It is not a
substitute for the service braking system. The
service brake must be used to bring the vehicle
to a complete stop.
The retarder is provided with a switch on the
dashboard and a lever on the steering column
(refer to Controls and Instruments chapter).
NOTE
Extended use will raise the temperature of the
transmission fluid.
The retarder helps reduce speed on grades
without using the vehicle's conventional service
braking system. This virtually eliminates brake
overheating and reduces the risk of a runaway
vehicle. A retarder greatly increases the service
life of brake pads and discs, resulting in reduced
brake maintenance costs.
NOTE
Each time the transmission retarder system is
in operation, the stoplights automatically
illuminate.
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