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APPENDIX C
– Allison Transmission’s Other Features 3
CONTROL SYSTEM PROGNOSTICS
The transmission control system includes the
provision for the user to monitor various
transmission
operating parameters.
Transmission operating parameters monitored
by the prognostics feature are:

Oil Life Monitor

Filter Life Monitor

Transmission Health Monitor
NOTE
The prognostics package requires the use of
TranSynd™ or an Allison approved
TES295 or TES389 licensed fluid
in the
transmission and Allison High Capacity
filters . If any other fluids or filters are used,
Prognostic mode must be disabled .
Prognostic information will not be accurate
with any other fluids or filters and could result
in missed maintenance activities resulting in
transmission damage.
Refer to TES 295 or TES389 Approved Fluids
list, found under the Service/Fluids heading on
the home page of the Allison Transmission
web site.
www.allisontransmission.com
When a specified threshold is detected for any of
the serviceable conditions, the TRANSMISSION
SERVICE indicator is illuminated to alert the
operator. Failure to attend to the service
condition
and reset the TRANSMISSION
SERVICE indicator within a defined operating
period will result in illumination of the CHECK
light with associated message in the DID,
indicating the increased probability that the
service condition will develop into a more serious
condition.
To access the Prognostic Mode functions,
simultaneously press the
(Upshift) and
(Downshift) arrow buttons repeatedly. See the
reference table at the end of this section.
NORMAL PROGNOSTICS INDICATION AT
ENGINE START

A system bulb check illuminates the
TRANSMISSION SERVICE indicator
approximately 0.5 seconds.

If Prognostics features are enabled, the
TRANSMISSION SERVICE indicator
illuminates again for 3 seconds after the
bulb check. If Prognostics features are
disabled,
the TRANSMISSION
SERVICE indicator does not illuminate
again after the bulb check.
OIL LIFE MONITOR
The display message denotes the
calculated remaining life of the transmission
fluid. This value is based on the established
life for the required baseline fluid, and then
is continuously adjusted for cumulative
effects of such operating parameters as
operating time, retarder operation, output
shaft revolutions and shift frequency.
Display
The display is a two-digit number, denoting
percentage of the fluid life which remains. New
fluid is displayed as 99%.
The TRANSMISSION SERVICE indicator will
be illuminated, denoting a required change of
transmission fluid, when the remaining fluid life
reaches approximately 1 %. The indicator will be
lit steadily upon each initialization of the TCM,
and will remain on steady for approximately 2
minutes after the
first selection of “D” (drive)
range each time, until service is performed and
the indicator is reset.
Failure to perform maintenance and reset the
TRANSMISSION SERVICE indicator within a
defined period will result in the illumination of the
CHECK light with associated message in the
DID and diagnostic code P0897 Transmission
Fluid Deteriorated.
Reset
The TRANSMISSION SERVICE indicator can be
reset by a message over the SAE J1939
communication interface, with the Allison DOC™
for PC diagnostic program, or by depressing and
holding the MODE button for ten (10) seconds
while the Oil Life Monitor function is displayed. It
may also be reset by selecting N-D-N-D-N-R-N
on the shift selector, pausing briefly (less than 3
seconds) between each selector movement, with
the ignition on and the engine not running. The
TRANSMISSION SERVICE indicator illuminates
briefly following a reset to acknowledge the reset
was successful.
Setting Fluid Type for Prognostics
The fluid type can be programmed if the specific
calibration allows it. The operator can do the
following: