Cayman 2006
Chassis Information — Section 10 • 261
TRANSMISSION
The Allison MH-2500 series transmission is a fully automatic, torque-converter driven,
electronically controlled transmission. The electronic controls provide automatic gear selection
in all drive ranges and automatic engagement of the torque converter lockup clutch.
The electronic control system has fi ve major components: the Transmission Control
Module (TCM), engine throttle position sensor, three speed sensors, Neutral Start Back Up
(NSBU) switch and the control valve module. The TCM processes information received
from the throttle position sensor, speed sensor, NSBU switch and control valve module.
The electronic control system optimizes shift quality by using “Adaptive Shifting.” A wide
variety in shifting under varied conditions is required before optimizing the shift quality.
Generally, fi ve typical shifts of a shift type are needed for shift calibration.
Transmission Key Pad Functions:
• Selects
Neutral
by pressing
N
. The area around the N button has a raised ridge so the driver can orient his
hand to the Neutral button by touch.
• Selects
Reverse
gear by pressing
R
.
• Selects the forward
Drive
range by pressing
D
. The
SELECT
and
MONITOR
will indicate
D1
,
indicating the transmission is in 1st gear. Throughout the subsequent upshifts or downshifts, the
SELECT/
MONITOR
display will indicate the gear the transmission is in.
• The
upshift
and
downshift
arrow
buttons are used to select a higher or lower forward range. These
buttons are not functional in Neutral or Reverse. One press changes the gear selected by one range. If the
up
or
down arrow
button is held continuously, the range will continue to change up or down until the
button is released or until the highest/lowest possible gear is selected.
• The
Mode
button enables Economy Mode.
Economy Mode:
Economy Mode affects the upshift schedule D-3, D-4, D-5 and downshift schedule D-5, D-4, D-3. During
highway driving with the cruise control set between 55 to 65 mph, setting the transmission to Economy Mode
eliminates about 99% of transmission downshifts from fi fth to fourth when incurring a slight incline or overpass.
In city driving, with the transmission set to Economy Mode, the transmission will upshift approximately 200
RPM sooner using less fuel with reduced engine noise. DO NOT use Economy Mode while traveling in mountain
terrain. The lower RPM shift schedule will reduce the fl ow of antifreeze, lubricating oil and airfl ow through the
radiator resulting in increased transmission and engine temperature.
•
To Enter Economy Mode:
Press the MODE button. The LED will illuminate.
•
To Exit Economy Mode:
Press the MODE button. The LED will extinguish.
CAUTION:
Do not use the economy mode in heavy stop and go traffic or mountainous terrains.
Frequent shifting occurs when in Economy Mode while using heavy throttle, increasing
transmission fluid temperature. Exit Economy Mode until road conditions improve.
NOTE:
The display will change to a default reading of D-3 when the Auxiliary Braking device is used.
This setting is pre-selected at the factory and can only be altered by an authorized Allison
Service center. The transmission is not actually in third gear. This is only a reference point so
the transmission will optimize engine braking efficiency.
080386c
020168B
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Страница 287: ...Cayman 2006 Chassis Information Section 10 279 METRIC U S CONVERSION CHART ...
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