PREVOST H 2018 Series Operator'S Manual Download

Page: 245 / 258

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: