Section 07: TRANSMISSION
PA1562
6
6. Be sure fluid level checks are consistent.
Check level more than once and if readings
are not consistent, check to be sure the
transmission breather is clean and not
clogged. If readings are still not consistent,
contact your nearest Allison dealer or
distributor.
NOTE
The Cold Check is more appropriate for
verifying the oil level after the first fill-up. In case
of conflict, the Hot Check has priority over the
Cold Check; the fluid level check using the
pushbutton shift selector has priority over
the Hot Check.
3.1.4 Fluid Level Check Using the Pushbutton
Shift Selector
Oil level codes are obtained as follows:
1. Park vehicle on a level surface, select «N»
(neutral) on the pushbutton shift selector
and apply parking brake.
2. Press simultaneously the (Up) and
(Down) arrow buttons once.
3. Oil level codes are displayed in 2 minutes
(e.g. display will flash and 8, 7, 6, 5, ...;
countdown will occur during the 2 minutes)
once the following parameters are met:
o Waiting time, vehicle must be stationary
for at least 2 minutes to allow the oil to
settle;
o Engine at idle;
o Oil at normal operating temperature,
between 140°F (60°C) and 220°F (104°C);
o Transmission in «N» (Neutral);
o Transmission output shaft stopped;
o Oil level sensor present and working.
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
CODE CAUSE OF CODE
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.
3.1.5 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
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