• The UPSHIFT and DOWNSHIFT arrow buttons are used to
select a higher (if not in “D”) or lower (if not in “1”) forward
range. These buttons are not functional in NEUTRAL or
REVERSE. One press changes the range selected by one range.
If the button is held continuously, the selected range will continue
to change up or down until the button is released or until the
highest/lowest possible range of gears is selected.
• The MODE button enables a secondary shift point to be selected.
This is commonly referred to as “Economy.” It is further used
by the service technician to access diagnostic codes when
troubleshooting. The diagnostic circuitry must be enabled to
display.
• When the Auxiliary Braking device is used, the display changes
to a default reading of two or three. This default is pre-selected
at the factory and can only be reprogrammed by an authorized
Allison Service Center. The transmission is not in second or
third gear. This is only the reference for the RPM shift points to
optimize the braking capacity.
The electronic control system is programmed to inform the operator of a
problem with the transmission system and automatically take action to protect
the operator, motorhome and transmission. When the Electronic Control Unit
(ECU) detects a DO NOT SHIFT (DNS) condition the ECU restricts shifting,
turns the CHECK TRANS light on the instrument panel and registers a
diagnostic code.
NOTE: For some problems, diagnostic codes may be regis-
tered without the ECU activating the CHECK TRANS
light. An Allison Transmission authorized service outlet
should be consulted whenever there is a transmission related
concern. They have the equipment to check for diagnostic
codes and to correct problems which arise.
Each time the engine is started the CHECK TRANS will light, then turn
off after a few seconds. This momentary lighting is to show that the status
light circuits are working properly. If the CHECK TRANS light does not
illuminate during start up, or if the light remains on after start up, the system
should be checked immediately.
Continued illumination of the CHECK TRANS light during vehicle
operation (other than start up) indicates that the ECU has signaled a diagnostic
code. Illumination of the CHECK TRANS light is accompanied by a flashing
display from the shift selector. The shift selector display will show actual
range attained and the transmission will not respond to shift selector
requests.
Chassis Information
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
DIPLOMAT
10•292
Transmission -
Check Light
To Next Page
Loading...
