Oil Level Check Using The Pushbutton Shift Selector; Control System Prognostics - PREVOST H3-45 VIP Owner's Manual

C-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 level is displayed
as shown. The number
indicates the number of
quarts of
transmission requires.
(Upshift) and
leve l is
fluid the
PA-1638 Owner's Manual X3-45 VIP
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 TOO LOW Engine speed (rpm) too low
ENG RPM TOO HIGH Engine speed (rpm) too high
MUST BE IN NEU
OIL TEMP TOO LOW
OIL TEMP TOO HIGH
VEH SPD TOO HI
SENSOR FAILED

CONTROL SYSTEM PROGNOSTICS

The transmission control system includes the
provision for the user to monitor various transmission
operating parameters.
parameters monitored by the prognostics feature are:
Oil Life Monitor
l
Filter Life Monitor
l
Transmission Health Monitor
l
CAUSE OF FAULT CODE
Settling time too short
N (Neutral) must be selected
Sump fluid temperature too
low
Sump fluid temperature too
high
Output shaft speed
Sensor failure
Transmission operating