C-2 Allison Transmission Other Features
PA-1652 Operator's Manual H3-45 Coach
OIL LEVEL CHECK USING THE
PUSHBUTTON SHIFT SELECTOR
NOTE: You will find the complete
transmission operation instructions and
driving tips in the Allison 5th & 6th
Generation Operator’s Manual 3000_ 4000
Series available on the Prevost Technical
Publications site.
The oil level sensor (OLS) is standard in your
transmission. With the OLS and Allison 5
th
& 6
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:
l The vehicle has been stationary for
approximately 2 minutes to allow the oil to
settle;
l Engine at idle;
l Oil at normal operating temperature,
between 104°F (40°C) and 220°F (104°C);
l Transmission in «N» (Neutral);
l Transmission output shaft stopped;
l 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
The OLS has a detection range of LO4 to HI 3
that can display on the selectors.
The actual oil level to add may be greater than
4 liters (4.22 quarts) if the transmission is more
than 4 liters (4.22 quarts) low from the full mark.
The actual fluid volume to drain may be more
than 3 liters (3.17 quarts) if the transmission is
overfilled by more than 3 liters (3.17 quarts).
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
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