Coolant Leakage; Control System Prognostics; Normal Prognostics Indication At Engine Start; Oil Life Monitor - PREVOST H3-41 Maintenance Manual

3.3.5 Coolant Leakage

If engine coolant leaks into the transmission oil
system, immediate action must be taken to
prevent malfunction
damage. The transmission must be completely
disassembled, inspected, and cleaned. All traces
of the coolant contamination must be removed.
Friction clutch plates contaminated with ethylene
glycol must be replaced.
3.4

CONTROL SYSTEM PROGNOSTICS

The transmission control system includes the
provision for the user to monitor various
transmission operating
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
TES295 or TES389 licensed fluid in the
transmission and Allison High Capacity
filters. If any other fluids or filters are used,
Prognostic mode
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/Parts 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
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
(Downshift) arrow buttons repeatedly.
and possible serious
parameters.
Allison approved
must be disabled.
the TRANSMISSION
(Upshift) and
SECTION 07: TRANSMISSION
3.4.1 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,
SERVICE indicator
again after the bulb check.

3.4.2 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
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
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
PA1621 Maintenance Manual All Series | January 2017
the TRANSMISSION
does not illuminate
operating time, retarder
11
will