Section 07: TRANSMISSION
PA1562
9
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.
o 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.
Reset: The feature will reset automatically when
the main fluid filter has been changed and the
pressure drop across the filter no longer
exceeds the threshold value. A manual reset
can be performed by depressing and holding the
MODE button for ten (10) seconds while the
Filter Life Monitor function is displayed. It may
also be reset by selecting N-R-N-R-N-D-N on
the shift selector, pausing briefly (less than 3
seconds) between each selector movement,
with the ignition on and the engine not running.
o Transmission Health Monitor
The display message denotes clutch life status,
as determined by monitored changes and the
calculated running clearance of the transmission
clutches C1, C2, C3, C4 & C5.
Display: An acceptable clutch life status is
displayed as "OK". An unacceptable clutch life
status is displayed as "LO". The specific
clutch(es) for which the function indicates "LO"
cannot be identified with the shift selector.
Allison DOC
TM
for PC-Service Tool displays
clutch condition as OK or NOT OK for each
clutch, C1 through C5.
The TRANSMISSION SERVICE indicator will be
illuminated, indicating the need for clutch
maintenance, when the remaining clutch life
reaches approximately 10%, or if the running
clearance exceeds a maximum value which may
indicate a non-wear-related issue. Thereafter,
the indicator will be lit upon each initialization of
the TCM, and will remain on steady during all
vehicle operation until service is performed and
the indicator is reset.
Failure to perform maintenance and reset the
monitor after a number of warnings will result in
the illumination of the CHECK TRANS light on
the dashboard telltale panel and diagnostic code
P2789 Clutch Adaptive learning at Limit will be
set.
Reset: The feature will reset automatically upon
elimination of the clutch clearance condition
which initiated it. The indicator can also be
manually reset using the Allison DOC™ for PC
diagnostics program if necessary.
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