Filter Life Monitor - PREVOST H3-45 2023 Operator's Manual

C-4 Allison Transmission Other Features
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:
With the engine off and the ignition on, perform
the following sequence on the selector, N-R-N-D-
N-R-N-D-N-R-N-D-N.
The TRANSMISSION SERVICE indicator flashes
if TES389 is the current setting and illuminates
solidly if TES295 or TES668 is the current setting.
To change the transmission fluid type, wait 5
seconds after entering transmission fluid type
mode and perform the following sequences to
select the proper transmission type:
N-R-N to select TES295 or TES668
N-D-N to select TES389
The selector exits 30 seconds after entering
transmission fluid type mode or the ignition may
be turned off to exit earlier. Only one transmission
fluid type selection may be made after entering
transmission fluid type mode. All other attempts
will be ignored. Transmission fluid type mode
needs to be entered again if the wrong type of
fluid is selected.
CAUTION
Verify prognostic fluid type setting matches
transmission fluid type. Oil Life Monitor
notifications will be
mismatched. This could result in transmission
damage from running a TES389 fluid too long
or cause shortened TES295/TES668 fluid
changes to occur.
inaccurate when
PA-1652 Operator's Manual H3-45 Coach
CAUTION
Required calendar- based oil & filter change
intervals (based on months) 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 months
have passed when using TES295/TES668 fluid
type or before 24 months have passed when
using TES389 fluid type, it will be necessary to
change the fluid and filters per calendar
requirements and reset the system.

FILTER LIFE MONITOR

This feature provides an alert when the
transmission's fluid filters need to be replaced. It
helps extend filter change intervals to reduce
routine maintenance downtime while providing
maximum protection for the transmission.
The filter life indicator pressure switch signals the
transmission control module when fluid exiting
the main filter drops below a predetermined
pressure.
Both the main and lube filters must be changed
when the TRANSMISSION SERVICE indicator
shows the main filter should be changed.
Filter Change Notification
The TRANSMISSION SERVICE indicator
flash for 2 minutes after the first selection of "D"
(drive) range. Once the Filter Monitor mode has
been accessed via the shift selector, the "OIL
FILTER OK" or "REPLACE FILTERS" message
is displayed in the selector display window. An
acceptable filter life status is displayed as "OIL
FILTER OK". An unacceptable filter life status is
displayed as "REPLACE FILTERS".
Once the programmed threshold for maximum
filter pressure drop has been observed and
verified, the diagnostic code P088A Transmission
Filter Maintenance Alert 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
flash for 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 2 minutes after the first
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