Oil Level Check Using The Pushbutton Shift Selector; Diagnostic Troubleshooting Codes (Dtc) - Allison 5Th Generation Controls - PREVOST X3-45 Commuter 2020 Operating Manual

B-2 Allison Transmission Other Features
OIL LEVEL CHECK USING THE
PUSHBUTTON SHIFT SELECTOR
The oil level sensor (OLS) is standard in your
transmission. With the OLS and Allison 5
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
(Downshift) arrow buttons once.
4. Oil level codes are displayed once the
following parameters are met:
The vehicle has been stationary for
l
approximately 2 minutes to allow the
oil to settle;
Engine at idle;
l
Oil at normal operating temperature,
l
between 104°F (40°C) and 220°F
(104°C);
Transmission in «N» (Neutral);
l
Transmission output shaft stopped;
l
Oil level sensor present and working.
l
5. Correct fluid
displayed as shown.
6. Low fluid
displayed as shown. The
number indicates
number of quarts of fluid
the transmission requires.
DOB 1300-1556
(Upshift) and
leve l is
level is
the
7. High fluid level condition
with the number of quarts
in excess is displayed as
shown.
th
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
SETTLING OK
ENG RPM
LOW
ENG RPM
HIGH
MUST BE IN NEU
OIL TEMP
LOW
OIL TEMP
HIGH
VEH SPD TOO HI
SENSOR FAILED
DIAGNOSTIC TROUBLESHOOTING
CODES (DTC) — ALLISON 5TH
GENERATION CONTROLS
Diagnostic features are provided with the
transmission
PA-1639 Operator's Manual 2020 X3-45 Commuter
CAUSE OF FAULT
CODE
Settling time too short
TOO
Engine speed (rpm) too low
TOO
Engine speed (rpm) too high
N (Neutral) must be selected
TOO Sump fluid temperature too
low
TOO Sump fluid temperature too
high
Output shaft speed
Sensor failure
control system to assist in