A feature of both Allison 4
th
Generation Controls and WTEC III controls is
“autodetect.” Autodetect is active within the first several engine starts, depending
upon the component or sensor being detected. These engine start cycles begin
when the transmission is installed during vehicle manufacture. Autodetect searches
for the presence of the following transmission components or data inputs:
Transmission Components
Retarder Present, Not Present
Oil Level Sensor (OLS) Present, Not Present
Throttle Analog, J1587, J1939
Engine Coolant Temperature Analog, J1939, J1587
Seek help from the nearest Allison Transmission service outlet when any of the
above components are present, but are not responding properly.
Another feature of the Emergency Vehicle Series transmission is its ability to
adapt or “learn” as it operates. Each shift is measured electronically, stored, and
used by the TCM/ECU to adapt or “learn” the optimum control for future shifts.
NOTE: Allison 4
th
Generation Controls and WTEC III Controls are
designed and manufactured to comply with all FCC and other guidelines
regarding radio frequency interference/electromagnetic interference
(RFI/EMI) for transportation electronics. Manufacturers, assemblers, and
installers of radio-telephone or other two-way communication radios
have the sole responsibility to correctly install and integrate those
devices into Allison Emergency Vehicle Series transmission-equipped
vehicles to customer satisfaction.
The TCM/ECU is programmed to provide the most suitable operating
characteristics for a specific application. This manual does not attempt to describe
all of the possible combinations. The information contained herein describes only
the operating characteristics most frequently requested by the vehicle
manufacturer.
TORQUE CONVERTER
The torque converter consists of the following four elements:
• Pump—input element driven directly by the engine
• Turbine—output element hydraulically driven by the pump
• Stator—reaction (torque multiplying) element
• Lockup Clutch—mechanically couples the pump and turbine when engaged;
controlled by TCM/ECU
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