PREVOST X3-45 2016 Maintenance Manual Download

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Section 07: TRANSMISSION

PA1593

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 TRANS light on the dashboard
telltale panel, indicating the increased probability
that the service condition will develop into a
more serious condition.

To access the Prognostic Mode functions,
simultaneously press the (Up) and (Down)
arrow buttons repeatedly. See the reference
table at the end of this section.

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 1–2 %. The indicator will
be lit steadily upon each initialization of the
TCM, and will remain on steady for
approximately 1–2 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 TRANS light on the dashboard telltale
panel and diagnostic code P0897 Transmission
Fluid at Limit will be set.

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.

CAUTION

Required calendar-based oil & filter change
intervals (based on month) still apply because
Oil Life Monitor function cannot measure time
while ignition power is OFF.

If the Oil Life Monitor function has not indicated
the need for a fluid change before 60 month
(five years) have passed, it will be necessary
to change the fluid and filters per calendar
requirements and reset the system.

Filter Life Monitor

The display message denotes operating status
of the transmission main fluid filter, based on the
measured pressure drop across the filter. The
feature is not functional at transmission sump
temperatures below 40 ºC (105 ºF). Both the
main and lube filters

must be

changed when the

TRANSMISSION SERVICE indicator

shows

the main filter should be changed.

Display:

An acceptable filter life status is

displayed as "OK". An unacceptable filter life
status is displayed as "LO".

Once the programmed threshold for maximum
filter pressure drop has been observed and
verified, the diagnostic code P088A
Transmission Filter At/Over Limit will be
recorded to indicate that the filter has reached
the end of its designed life. At the next
initialization of the TCM, the TRANSMISSION
SERVICE indicator will flash for approximately
1–2 minutes after the first selection of “D” (drive)
range. Thereafter, the indicator will illuminate
and flash upon each TCM initialization,
continuing to flash for 1–2 minutes after the first
selection of a drive range each time, until
service is performed and the indicator is reset.

Failure to perform maintenance and reset the
monitor after a calibration-defined number of
warnings will result in the illumination of the
CHECK TRANS light on the dashboard telltale
panel and diagnostic code P088B will be
recorded to indicate a highly deteriorated filter.

PREVOST X3-45 2016, Maintenance Manual

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