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2 APPENDIX C
– Allison Transmission’s Other Features
ALLISON TRANSMISSION 5TH
GENERATION OIL LEVEL CHECK
USING THE PUSHBUTTON SHIFT
SELECTOR
The oil level sensor (OLS) is standard in your
transmission. With the OLS and Allison 5
th
generation shift selector, you can get a more
accurate electronic fluid level check than with a
dipstick.
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. Wait for at least 2 minutes to allow the oil to
settle;
3. Press simultaneously the
(Upshift) and
(Downshift) arrow buttons once.
4. Oil level codes are displayed once the
following parameters are met :

The vehicle has been stationary for
approximately 2 minutes to allow the
oil to settle;

Engine at idle;

Oil at normal operating temperature,
between 104°F (40°C) and 220°F
(104°C);

Transmission in «N» (Neutral);

Transmission output shaft stopped;

Oil level sensor present and working.
5. Correct fluid level is
displayed as shown.
6. Low fluid level is
displayed as shown. The
number
indicates the
number of quarts of fluid
the
transmission
requires.
7. High fluid level condition
with the number of quarts
in excess is displayed as
shown.
NOTE
Confirm a low fluid level condition by making a
manual fluid level check.
8. To exit the Oil Level Display Mode, press
any range button «R», «N» or «D» at any
time.
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.
If the fluid level check cannot be completed, an
Invalid for Display fault is reported. Refer to table
below to review the codes and conditions.
CODE CAUSE OF FAULT
CODE
SETTLING OK Settling time too short
ENG RPM TOO LOW Engine speed (rpm) too low
ENG RPM TOO HIGH Engine speed (rpm) too high
MUST BE IN NEU N (Neutral) must be selected
OIL TEMP TOO LOW Sump fluid temperature too low
OIL TEMP TOO HIGH
Sump fluid temperature too
high
VEH SPD TOO HI Output shaft speed
SENSOR FAILED Sensor failure