TATA Motors Aria, Owner'S Manual & Service Book, Page: 101 / 172

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SPECIAL FEATURES
Torque - On - Demand (TOD)
Transfercase : (If Equipped)
The “TOD” is a part time Torque on
demand Transfer case, responsible for
distributing torque between the front and
rear axles. The Torque-On- Demand
system is an electrically actuated clutch
mechanism that is used to control the
speed differential of the front and rear
outputs of a transfer case. According to
the driving conditions this system
automatically and smoothly delivers two-
wheel / four-wheel drive operations with
the help of ECU & Electromagnetic
clutch. In 4 X 4 / Auto mode, whenever
any slippage is detected in the rear
wheels (
in icy roads, wet surfaces, etc.)
the torque is transferred to the front
wheels by the TOD system.
Using TOD system:
TOD System provides two operating
positions i.e. 4 X 2 Mode and 4 X 4
(Auto) mode.
To activate 4 X 2 mode , press “4 X 2”
switch provided on your vehicle’s facia,
the LED on the switch turns “ON” . In
this mode, the engine power is supplied
to the rear wheels only.
To activate 4 X 4 / Auto mode , again
press “4 X 2” switch provided on your
vehicle’s facia, the LED on the switch
goes “OFF” . In this mode, the engine
power is supplied to both front & rear
wheels, based on the driving conditions.
4 X 2 mode is active.
LED comes ‘ON’.
4 X 4 / Auto mode is
active.
LED goes ‘OFF’.
TORQUE 0N DEMAND (TOD)
At Ignition On , TOD shall attain the mode
(4x4 or 4x2) that it was in when you last
switched OFF the ignition.
TOD Indicator:
TOD indicator turns “ON” when there is
a malfunction in the TOD system.
In
such a case, please take your vehicle
to a Authorized Service station.
NOTE
When TOD is in “4 X 4 / Auto” mode
& Ignition switch is in “ON” position,
you will hear a slight noise from the
Axle connect mechanism. Similarly
you will hear same noise while
changing over from 4 X 2 to 4 X 4 /
Auto mode and vice-versa.
CAUTION
While changing over from ‘4X2’ to
‘4X4/AUTO’ or vice-versa, the vehicle
speed should be below 80kmph.