Allison Transmission Other Features C-5
PA-1652 Operator's Manual H3-45 Coach
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 light with associated message in the DID
and diagnostic code P088B will be recorded to
indicate a highly deteriorated filter.
Read And Reset Filter Life Monitor From
Selector
To enter the filter life monitor, press
simultaneously the (Upshift) and
(Downshift) arrows three times. An acceptable
filter life status is displayed as "OIL FILTER OK".
An unacceptable filter life status is displayed as
"REPLACE FILTERS".
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. The
TRANSMISSION SERVICE indicator
illuminates briefly following a reset to
acknowledge the reset was successful.
TRANSMISSION HEALTH MONITOR
This prognostic feature determines clutch life
status of the transmission’s clutches and alerts
you when clutch maintenance is required. The
clutch life status is determined by monitoring
changes and the calculated running clearance of
the transmission clutches.
Clutch Maintenance Notification
The transmission health monitor feature
determines when clutch maintenance is needed.
If any of the clutches (except lockup) reaches a
remaining life of approximately 10% or if any of
the clutch running clearances exceeds a
maximum value, then the TRANSMISSION
SERVICE indicator is steadily illuminated from
just after ignition on until ignition is turned off.
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. If the
transmission health monitor mode has been
accessed via the shift selector, a “TRANS
HEALTH OK” or “TRANS HEALTH LO” is
displayed. An acceptable clutch life status is
displayed as “TRANS HEALTH OK”. An
unacceptable clutch life status is displayed as
“TRANS HEALTH LO”.
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