C-2 Allison Transmission Other Features
PA-1628Operator's ManualH3-45 COACH
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:
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 leve l 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
CONTROL SYSTEM PROGNOSTICS
The transmission control system includes the
provision for the user to monitor various transmission
operating parameters. Transmission operating
parameters monitored by the prognostics feature are:
l Oil Life Monitor
l Filter Life Monitor
l Transmission Health Monitor
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