• 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 but-
tons 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 will enable secondary shift point to be selected. This
is commonly referred to as “Economy.” It is further used by the serv-
ice technician to access diagnostic codes when troubleshooting. The
diagnostic circuitry must be enabled to display.
The electronic control system is programmed to inform the operator of a
problem with the transmission system and automatically take action to pro-
tect 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 regis-
ters a diagnostic code.
NOTE: For some problems, diagnostic codes may be registered
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 oper-
ation (other than start up) indicates that the ECU has signaled a diagnostic
code. Illumination of the CHECK TRANS light is accompanied by a flash-
ing display from the shift selector. The shift selector display will show actual
range attained and the transmission will not respond to shift selector requests.
Indications from the shift selector are provided to inform the operator that
the transmission is not performing as designed and is operating with reduced
capabilities. Before turning the ignition off, the transmission may be operated
for a short time in the selected range in order to “limp home” for service
assistance. Service should be performed immediately in order to minimize
potential for damage to the transmission.
When the CHECK TRANS light comes on and the ignition switch is
turned off the transmission will remain in N (Neutral) until the condition
causing the CHECK TRANS light is corrected. Generally, while the CHECK
Chassis Information
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WINDSOR
10•288
Transmission
- Check Light
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