MG MG6 Series 2011 Service Manual page 401

Transmission-AT
In Tiptronic mode TCM will prevent automatic upshifts and
the engine speed can be increased to maximum. The TCM,
however, only allows manual gearshifts if the engine speed
is within preset parameters. If the vehicle is brought to a
standstill, 1st gear will be selected automatically. All gears,
including 5th, can be selected and the current gear will be
displayed in the driver's instrument pack. In Tiptronic mode,
the vehicle can start in 1st, 2nd or 3rd gear.
Snow Mode
In winter mode, start the vehicle in 2nd gear, the TCM will
modify gear change scheduling to aid the control of the vehicle
in wet or icy conditions. Gear changes will shift at lower engine
speeds.
Cruise Mode
Activating cruise control will prompt the TCM to enter cruise
mode. The cruise control system requires quick acting and
large throttle angle variations to maintain the vehicle speed,
which causes the transmission to continually up and down shift.
When cruise control is selected a signal is sent to the TCM
which activates a specially designed cruise control shift map
that is far less sensitive to changes in throttle angle.
Upslope Mode
Hill mode modifies the transmission shift pattern to assist
driveability on steep gradients.
conditions to activate hill mode by monitoring the engine
torque values, throttle angle and engine speed. This mode
delays upshift when the throttle is briefly released, such
as when approaching a corner on a steep gradient, thus
preventing unnecessary gear changes.
Version 2.0
The TCM detects the
Hot Mode
The purpose of the transmission fluid cooling strategy is to
reduce engine and transmission temperatures during high
load conditions. Under these conditions the engine and
transmission may generate excessive heat. The TCM will
adopt a 'Hot Mode' gear shift strategy if the sensor signals an
ATF temperature above 130℃. When the TCM selects Hot
Mode early upshift of the gears will be experienced and the
lock-up clutch will operate in third, fourth and fifth gears. This
will reduce either the engine speed or the slip in the torque
converter, therefore reducing the heat generated. Normal
gearshift strategy will resume if the ATF temperature falls
below 125℃.
Entering 'Hot Mode' does not cause the illumination of any
warning lights in the instrument pack.
Gear Shift Inhibition (ABS/DSC Active)
If current gear shifting is in progress, this function inhibits gear
shifting after current gear shifting is finished.
Gear shifting for following purpose is allowed even if this
function is activated.
• Gear shifting for protection of Engine or Automatic
Transmission
Such as prevention of engine over revolution, prevention
of clutch slipping in situation that high torque and low
speed at high gear.
• 1-2 upshift as fail safe action for 1st gear failure.
• Gear selection of emergency mode.
Transmission
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