Section 07: TRANSMISSION
PA1593
5
After 2 minutes, the display will flash one of the
codes shown below:
CODE CAUSE OF CODE
O L…O K Oil level is correct
O L…L O… 1 Oil Level is LOw 1 quart
O L…L O… 2 Oil Level is LOw 2 quart
O L…L O… 3 Oil Level is LOw 3 quarts
O L…L O… 4
Oil Level is LOw 4 or more
quarts
O L…H I… 1 Oil Level is HIgh 1 quart
O L…H I… 2 Oil Level is HIgh 2 quarts
O L…H I… 3
Oil Level is HIgh 3 or more
quarts
O L… – (fc)
Oil Level is invalid. Source
of invalid reading is
defined by a two-character
fault code (fc)
NOTE
Note that the quantities LO 4 and HI 3 are the
largest values displayed and that the actual
variation in oil level may exceed these
numbers.
NOTE
Failure to meet one of the above parameters
will stop the two minute countdown. One of
the codes shown hereafter will indicate the
cause of the countdown interruption. Once all
parameters are met, the countdown will
continue from where it left off.
If the fluid level check cannot be completed, an
Invalid for Display fault is reported. This
condition is reflected by the display of "OL",
followed by “–“, followed by one or two additional
characters. The displayed characters define the
cause of the fault, which may be either a system
malfunction or an improper condition for
conducting the check.
CODE CAUSE OF CODE
OL…-…0X Waiting period is not complete
OL…-…EL Engine speed (rpm) too low
OL…-…EH Engine speed (rpm) too high
OL…-…SN N (neutral) must be selected
OL…-…TL Sump oil temperature too low
OL…-…TH Sump oil temperature too high
OL…-…SH Output shaft rotation
OL…-…FL Sensor failure
To exit the Oil Level Display Mode, press any
range button: “R”, “N” or “D” at any time.
3.3 IMPORTANCE OF PROPER FLUID
LEVEL
It is important that the proper fluid level be
maintained at all times because the
transmission fluid cools, lubricates, and
transmits hydraulic power. If the fluid level is too
low, the converter and clutches do not receive
an adequate supply of fluid. If fluid level is too
high, the fluid can aerate, causing the
transmission to shift erratically or overheat.
3.4 KEEPING OIL CLEAN
Oil must be handled in clean containers, fillers,
etc., to prevent foreign material from entering the
transmission. Place the dipstick on a clean
surface area while filling the transmission.
CAUTION
Containers or fillers that have been used to
handle antifreeze or engine coolant must
NEVER be used for handling transmission fluid.
Antifreeze and coolant solutions contain
ethylene glycol that, if introduced into the
transmission, can cause the clutch plates to fail.
3.5 RECOMMENDED AUTOMATIC
TRANSMISSION FLUID
Hydraulic fluids used in the transmission are
important influences on transmission
performance, reliability and durability. Castrol
TranSynd™ Synthetic Fluid and DEXRON-III®
fluids are recommended for on-highway
applications.
TranSynd™ is a full synthetic transmission
fluid developed by Allison Transmission and
Castrol Ltd. This fluid meets Allison
specifications for Severe Duty and Extended
Drain Intervals. TranSynd™ is fully qualified to
the Allison TES295 specifications and is
available through Prevost Parts.
NOTE
The prognostics package requires the use of
TranSynd™ or an Allison approved TES-295
licensed fluid in the transmission and Allison
High Capacity filters. If any other fluids or filters
are used, Prognostic mode must be disabled.
Prognostic information will not be accurate with
any other fluids or filters and could result in
missed maintenance activities resulting in
transmission damage.
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