B-4 Allison Transmission Other Features
DOB 1300-1556
PA-1639 Operator's Manual 2020 X3-45 Commuter
DIAGNOSTIC CODE DISPLAY AND
CLEARING PROCEDURE
Diagnostic codes can be read and cleared by two
methods:
l
Using an Allison DOC™ diagnostic tool. For
specific instructions on how to use an Allison
DOC™ diagnostic tool, refer to the User
Guide.
l
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.
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 push button shift selector.
2. Press any range button «D», «N» or «R» on
the push button shift selector.
3. After approximately 10 minutes of inactivity
at the push button 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 clearing procedure is
completed. «N» (Neutral) must be manually
selected.
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