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42 Transmission
9-5
Another new feature is the Hall sensor used for
the input and output shaft speed sensors that
have previously been of the inductive type. This
change in sensor has been made because Hall
sensors are more precise, they supply a clear
square wave at speeds as low as 20 rpm where
the earlier inductive sensors required at least 50
rpm to supply a sine wave that changed with
respect to frequency and amplitude.
The valve body now contains 5 "on-off" solenoids
and 3 PWM solenoids. Solenoids S1-S5 control
the flow of oil to the various clutches and brakes
as before. The current consumption of the 5 "on-
off" solenoids is 1A continuous and 2A maximum.
As on earlier models, the new transmission has
shifting programs for different situations. In short,
the TCM detects the driving conditions with
respect to terrain and driver characteristics, and
can adapt the shifting points according to this
information. For example, when driving up a long
hill, the TCM will detect that the load is not
decreasing despite the fact that a higher gear
should have been engaged at the current speed.
This means that the transmission will stay in the
lower gear to avoid "hunting" due to continual up
and down shifting. This system provides a
pronounced improvement in riding comfort.
Three different temperature programs are also
stored in the TCM in order to spare the gearbox
from thermal damage that can result in burned
discs and black, oxidized, burned oil:
HOT 1 activated at a transmission temperature of
128°C/262°F and deactivated at 120°C/248°F.
This is achieved by engaging lock-up in 3rd gear
(lock-up is normally allowed in 4th and 5th gears
only), which gives lower oil temperatures thanks
to the elimination of slip in the converter.
HOT 2 activated at 135°C/275°F and deactivated
at 130°C/266°F. This is achieved by engaging
lock-up in 2nd gear.
HOT 3 activated at 145°C/293°F and deactivated
at 135°C/275°F. At this temperature, TCM will
request torque limitation to 200Nm from Trionic 7.
If the temperature still rises above 155°C/311°F
for longer than 10 seconds or 140°C/284°F for
longer than 60 seconds at speeds above 180
km/h (111 mph), DTC P0218 will be set. A bus
message "TRANSMISSION OVERHEATING" will
be sent from the TCM to the SID display and the
transmission will go into limp-home mode (only
5th gear, 2nd gear and reverse will be available).