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20 08 CONTESSA
CHASSIS INFORMATION — 10
The Mode button enables a secondary shift
schedule to be selected. This is commonly
referred to as Economy mode. Economy
mode affects the upshift schedule 3-4, 4-5,
5-6 and downshift schedule 6-5, 5-4, 4-3.
During highway driving, with the cruise
control set between 55 and 65 m.p.h.,
placing the transmission in economy mode
will eliminate about 99% of transmission
downshifts from sixth to fth when
incurring a slight incline or overpass.
CAUTION:
DO NOT use Economy Mode in heavy
stop and go traffic or mountainous
terrains. Frequent shifting while using
heavy throttle occurs in Economy
Mode and increases transmission fluid
temperature. Exit Economy Mode until
road conditions improve.
NOTE:
The transmission shift schedule is
adjusted to reduce frequent downshifts
when Cruse power is enabled. Turn the
Cruise power off when in mountainous
terrain or heavy traffic.
NOTE:
The Mode button is used by the service
technician to access diagnostic codes
when troubleshooting. The diagnostic
circuitry must be enabled to display.
CAUTION:
Engine temperature may rise when
ascending long grades using full throttle.
Towing a load will increase the demand
on the engine. If this occurs, manually
shift the transmission to the next lower
gear and use less throttle. The engine will
use less fuel and RPM should increase.
NOTE:
The transmission will not accept a
manually selected gear change to occur
if the gear selected is out of the specified
operating range.
NOTE:
The transmission will not shift into gear
from Neutral if the engine RPM is at or
above 900. The display will flash “66”
indicating the engine RPM is excessive.
Select “N” and lower engine RPM.
Check Trans Indicator
The electronic control system of the
transmission is programmed to alert operator
of a problem with the transmission system, and
reacts automatically to protect the motorhome
and transmission from damage. Normally, the
Check Trans indicator on the speedometer LCD
will display when there is an error condition.
The indicator will go out after the engine
has started. The transmission system should
be checked immediately if the Check Trans
indicator displays. The Check Trans warning
indicates the ECU has detected a fault and
recorded a diagnostic code. The Check Trans
warning is accompanied by a ashing display
from the shift selector.
The shift selector display shows the actual range
attained and the transmission does not respond
to shift selector requests when the ECU detects a
Do Not Shift (DNS) condition. Indications from
the shift selector inform the operator that the
transmission is operating at reduced capabilities.
The transmission generally will downshift to 4th
gear. The torque converter will not “lock-up”
and engine speed is automatically reduced.
Direction changes (i.e. forward to reverse)
are not allowed. This allows time to nd a
safe place to park the motorhome to prevent
transmission damage. If the engine is shut off
and then started after a Check Trans indication,
the transmission remains in Neutral until the
fault is corrected. Service should be performed
immediately in order to minimize potential
damage to the transmission.
NOTE:
Contact an authorized Allison
Transmission service center whenever
a transmission related concern arises.
For some problems, fault codes may be
registered without the ECU activating
the Check Trans indicator. An
authorized Allison Transmission Service
center will have the equipment to check
diagnostic codes and correct problems
that may arise.
Diagnostic Codes:
The shift selector can be used to display
transmission malfunctions as numerical codes.
Each code is a two-digit main code and a
two-digit sub code. These codes will fall in
two classes: active and inactive. Active codes
are codes currently affecting the ECU process
and transmission operation. Inactive codes
are retained in memory but may not affect
the ECU process or transmission operation.
A service technician will activate Diagnostic
mode or hook an electronic display (Pro-Link)
to the data plug to retrieve diagnostic codes.
A maximum of ve codes, D1 to D5, may
be listed at one time. The highest priority
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