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Transmission 41
9-5
Transmission
5-Speed automatic transmission (Available on Linear and
Aero, Standard on Arc)
Brief description
A new 5-speed automatic transmission has been
introduced on the 9-5 engines.
The new transmission is based on the tried and
tested 4-speed Aisin-AW that has been fitted on
the 9-5 since its introduction. Special advantages
of the new transmission include faster
acceleration, lower fuel consumption, and
improved utilization of engine capacity through
more gear steps.
The control module (TCM) is also new and now
has adaptive functions with two 38-pin
connectors. The control module software is
updateable using procedures in SPS.
The AF33/5 automatic transmission has a 5-
speed gearbox with Lock-Up. The AF33/5 is
principally built around 4 planetary gears, a
torque converter with lock-up, a hydraulic control
system and an electric control system.
The transmission is governed by a control
module (TCM) that continuously processes the
information it receives from its own sensor and
from other control modules. Using this
information, the control module governs the
transmission hydraulic system so that the correct
gear is selected with respect to the conditions at
hand. The TCM also takes into consideration any
wear that may be present in the gearbox to
ensure smooth gear changing even when the
gearbox is worn. In this adaptive system, the
TCM compares the current gear changing
performance with a gear changing matrix in the
software and "learns" whatever each gear
changing situation requires with respect to
pressure/time in order to perform the gear
change comfortably.
This memory, as well as the memory for fault
codes, is stored in an EEPROM, which means
that the information will remain in memory even if
the power is cut. Because of this, the TCM must
be reset (using Tech 2) after carrying out repairs,
exchanging the gearbox or TCM, and after SPS
programming. The TCM is located in the same
position, inside the cabin between the glove box
and the bulkhead.
The TCM self-diagnosis continuously monitors all
the functions of the system and sets DTC’s if
necessary.
As before, it is possible to choose between three
different driving programs:
• Normal
• Sport
• Winter
”Slipping" lock-up
A new feature with this gearbox is that the lock-
up clutch is allowed to "slip" under certain driving
conditions (allows a difference in speed of 50-200
rpm between the pump and turbine wheels to
avoid downshifting unnecessarily for moderate
torque requests). This feature saves fuel and
prevents vibration and noise in the body. Slipping
lock-up is allowed in 4th and 5th gears and only
when the transmission fluid temperature is above
40°C (104°F).
The fluid used in this transmission system is a
completely new type due to the increased stress
caused by the slipping lock-up. The fluid is
designated JWS 3309, (Aisin-AW spec). JWS
3309 is a mineral-based ATF with unique
additives, high coefficient of friction and very high
resistance to thermal oxidation. This fluid is
factory standard on model -02 cars and applies
also to 9-3 (4-speed aut.). JWS 3309 will mix with
Dexron II and III. JWS 3309 is therefore
"backwards compatible," but will not provide any
advantages over standard fluid in earlier 4-speed
automatic transmissions. However, only JWS
3309 is to be used in Aisin AW 33/5 and no other
fluid. The gearbox can withstand a torque of 350
Nm (258 ft.lb.) that is allowed in 3rd, 4th and 5th
gears. In 1st and 2nd gears, a torque of 330 Nm
is allowed. Overboost (2.3HOT on Aero) is not
allowed.