DEFINITIONS AND ABBREVIATIONS
W T E C I I I E L E C T R O N I C C O N T R O L S T R O U B L E S H O O T I N G M A N U A L
Oil Level Sensor Electronic device (optional) on control module for indicating
transmission fluid level.
PROM Calibration Configurator System
Personal Computer Memory Card International Association Memory device for use
with Pro-Link® containing Allison Transmission programming and diagnostics.
Programmable Read Only Memory
Primary Shift Selector Main shift selector in a two-selector control system.
Pulse Width Modulated Solenoid Solenoids are controlled by pulse width modulation.
Solenoid control of clutch pressures is based on the solenoids duty cycle. Duty cycle is
determined by the ratio of solenoids on-time to off-time.
Retarder Modulation Request Signal from a retarder control device.
Return to Previous Range Diagnostic response in which the transmission is
commanded to return to previously commanded range.
Serial Communication Interface Used to transmit data and messages between the
diagnostic tool and the ECU and other systems such as electronically-controlled engines.
All SOLenoids OFF
Serial Peripheral Interface The means of communication between the microprocessor
and the interface circuits.
Secondary Shift Selector Alternate shift selector in a two-selector control system.
TransID A feature which allows the ECU to know the transmission configuration and
provide the corresponding calibration required.
Throttle Position Sensor Potentiometer for signaling the position of the engine fuel
Version Abbreviation used in describing ECU software levels.
Volts Direct Current (DC)
Vehicle Interface Module A watertight box containing relays and fuses interfaces the
transmission electronic control system with components on the vehicle.
Vehicle Interface Wiring Interfaces ECU programmed input and output functions with
the vehicle wiring.
Unit of electrical force.
Wide Open Throttle
Infinity Condition of a circuit with higher resistance than can be measured, effectively
an open circuit.