Labrie EXPERT, Maintenance Manual

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Allison Transmission Parameters
In Allison transmissions used on automated vehicles, the Transmission Control Module (TCM)
manages several functions:

It prevents the pump from engaging if the engine speed is higher than 900 RPM.
 It also controls the auto-neutral system (if so equipped).
The TCM is programmed using the Allison DOC software installed on a laptop computer. Allison
DOC is also necessary to verify if signals are properly reaching the TCM and to verify the fault code, if
any.
Figure 9 - 21 Allison Doc software
If the TCM of your vehicle requires repair or replacement, or if it needs specific programming
parameters, see Programmed Parameters below.
Programmed Parameters
N
OTE
: The following tables show parameters that are not necessarily specific to your vehicle. These
are general parameters. To obtain the parameters that are closely related to your vehicle,
contact Labrie Plus and ask for the electrical schematic pertaining to your truck model with all
the options installed.
Programming the TCM affects the engine speed, the
PTO
engagement and operation as well as the
(optional) auto-neutral system. If the TCM is replaced, the new TCM must be reprogrammed to
reset the vehicle operating parameters. Refer to Table 5 to reprogram the new TCM.
On chassis supplied by Labrie, the programming package for Allison transmissions is package #142.
Some customer chassis may have different programming packages. Refer to your local Allison dealer
for original programming packages. For further information regarding TCM programming, contact
Labrie Plus .
The following pages show how Allison TCMs are programmed for Labrie vehicles.
N
OTE
: The parameters shown in the following tables are typical values and are given for guidance
only. Some vehicles may need different parameters based on the options installed. Please call
Labrie Plus for the values that are specific to your vehicle.