PREVOST X3-45 COMMUTER User Manual

SECTION 07: TRANSMISSION
16
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
7.1.3 Diagnostic Code Display and Clearing
Procedure
Diagnostic codes can be read and cleared by
two methods:
o Using an Allison DOC™ diagnostic tool. For
specific instructions on how to use an Allison
DOC™ diagnostic tool, refer to the User
Guide.
o Using the pushbutton shift selector.
To begin the diagnostic process:
1. Bring the vehicle to a stop at a safe location.
2. Apply the parking brake.
To display stored codes:
1. Simultaneously press the
(Upshift) and
(Downshift) arrow buttons five times
(Prognostics enabled) to access the
Diagnostic Display Mode. With Prognostics
disabled, press the
(Upshift) and
(Downshift) arrow buttons twice.
2. Press the MODE button to read the next
code in the queue, if any.
To clear all active stored codes:
While in Diagnostic Mode, clear all active codes
by pressing and holding the MODE button for
approximately three seconds until the MODE
message flashes. Release the MODE button.
The MODE message should not remain
illuminated if the active DTC shown in the display
has cleared.
While in Diagnostic Mode, press and hold the
MODE button for 10 seconds to clear both active
codes and inactive codes. The MODE message
flashes a second time indicating all codes are
cleared from the queue.
7.1.4 Exiting Diagnostic Mode
Exit the diagnostic mode by one of the following
methods:
1. Press simultaneously the
(Upshift) and
(Downshift) arrow buttons at the
same time on the pushbutton shift
selector.
2. Press any range button «D», «N» or «R»
on the pushbutton shift selector.
3. After approximately 10 minutes of
inactivity at the pushbutton shift selector,
the diagnostic mode automatically exits
and returns to normal operating mode.
4. Turn off power to the TCM (shut off the
engine using the ignition key).
NOTE
Be sure to record all
codes displayed before
they are cleared. This is essential for
troubleshooting.
NOTE
If clearing a code while locked in a «D» (Drive)
or «R» (Reverse) position (fail-to-
range), the
transmission will still be in «D» (Drive) or «R»
(Reverse) when the clea
ring procedure is
completed. «N» (Neutral) must be manually
selected.
7.1.5 Diagnostic Trouble Code Response
The electronic control system is programmed to
inform the operator of a problem with the
transmission system via the CHECK light and
shift selector display while it automatically takes
action to protect the operator, vehicle, and
transmission. When the Transmission Control
Module (TCM) flags a Diagnostic Trouble Code
(DTC) as active, the TCM may take a
combination of diagnostic responses as listed in
the following table.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in