TURNING OFF THE VEHICLE
Always select N (Neutral) prior to turning off the vehicle engine.
PRIMARY/SECONDARY SHIFT SCHEDULES
The points at which shifts occur depend upon predetermined speeds and other
operating conditions. A transmission “shift calibration” includes several sets of
shift points which may be used according to current or anticipated operating
conditions. Some shift schedules may be inhibited as a result of operating
conditions, such as engine or transmission fluid temperature. Shift schedules may
be changed using the MODE button (some applications may use a dash-mounted
switch)—which is typically associated with a change in anticipated vehicle
operation.
The TCM includes the capacity for two separate and distinct shift calibrations
(customer-selectable), one for use in “Primary Mode” of operation and one in
“Secondary Mode.”
• Primary—This shift schedule is typically used for all normal vehicle
operations.
• Secondary—This is an alternate shift schedule that the TCM uses upon
request. Not all vehicles will be equipped with a secondary shift schedule.
The request can be interlocked with a vehicle component, or be
operator-controlled using the MODE button.
Your vehicle may have a dash-mounted light that illuminates when the secondary
mode is active.
CRUISE CONTROL OPERATION
Operating an Allison WTEC III Controls or Allison 4
th
Generation
Controls-equipped vehicle on cruise control may cause the transmission to shift
cycle if the cruise control speed setting is set too close to a scheduled shift point.
One of the following actions may eliminate shift cycling:
• Select the secondary shift schedule by pushing the MODE button (refer to
Figure 7 or Figure 8) on the shift selector.
• Select a lower range by pushing the ↓ (Down) arrow or moving the lever
on the shift selector.
• Change the cruise control setting away from the shift point.
Some vehicles equipped with an engine brake and an Allison WTEC III Controls
or Allison 4
th
Generation Controls-equipped transmission will have the engine
brake controlled by the TCM/ECU. This is done so the transmission will
automatically select a lower range when the engine brake is turned on and the
throttle is near idle position.
45
To Next Page
Loading...
Need help?
General
