STARTING AND DRIVING
}}
* Option/accessory.
471
Related information
•
•
Checking trailer lamps (p. 472)
•
Towing capacity and towball load (p. 634)
•
Overheating in the engine and drive system
(p. 463)
•
Adverse driving conditions for engine oil
(p. 638)
Trailer stability assist
*
The function of trailer stability assist (TSA
5
) is to
stabilise cars towing trailers in situations where
they begin snaking. The function is included in
the stability system ESC
6
.
Reasons for snaking
The snaking phenomenon can occur with any
car/trailer combination. Snaking normally occurs
at high speeds. But, there is a risk of it occurring
at lower speeds if the trailer is overloaded or the
load is improperly distributed, e.g. too far back.
In order for snaking to occur, there must be a
triggering factor, e.g.:
•
Car with trailer subjected to a sudden and
powerful side wind.
•
Car with trailer drives on an uneven road sur-
face or in a pothole.
•
Sweeping steering wheel movements.
If snaking has started, it could be difficult or even
impossible to suppress. This makes the car/
trailer combination difficult to control and there is
a risk that you could, for example, end up in the
wrong lane or leave the carriageway.
Trailer stability assist function
The trailer stability assist function continually
monitors the car's movements, particularly lateral
movements. If snaking is detected, the front
wheels are individually braked. This serves to sta-
bilise the car/trailer combination. This is often
enough to help the driver regain control of the
car.
If snaking is not eliminated the first time that
trailer stability assist intervenes, the car/trailer
combination is braked with all wheels and engine
power is reduced. Once snaking has been gradu-
ally suppressed and the car/trailer combination is
stable once again, the system stops regulating
and the driver once again has full control of the
car.
The stability function is deactivated if the
driver selects Sport mode by deactivating
ESC
via the menu system in the centre dis-
play.
Trailer stability assist may fail to intervene if the
driver uses severe steering wheel movements to
try to rectify the snaking because in such a situa-
tion the system cannot determine whether it is
the trailer or the driver causing the snaking.
5
Trailer Stability Assist
6
Electronic Stability Control
Summary of Contents for S90 TWIN ENGINE
Page 1: ...S90 T W I N E N G I N E OWNER S MANUAL ...
Page 2: ......
Page 17: ...15 ALPHABETICAL INDEX Alphabetical Index 645 ...
Page 18: ......
Page 19: ...OWNER INFORMATION ...
Page 28: ......
Page 29: ...YOUR VOLVO ...
Page 43: ...SAFETY ...
Page 76: ......
Page 77: ...DISPLAYS AND VOICE CONTROL ...
Page 146: ......
Page 147: ...LIGHTING ...
Page 161: ...WINDOWS GLASS AND MIRRORS ...
Page 177: ...SEATS AND STEERING WHEEL ...
Page 191: ...CLIMATE ...
Page 223: ...KEY LOCKS AND ALARM ...
Page 243: ...KEY LOCKS AND ALARM 241 Country Area Type approval Oman Serbia ...
Page 246: ... KEY LOCKS AND ALARM 244 Country Area Type approval Oman Serbia ...
Page 266: ......
Page 267: ...DRIVER SUPPORT ...
Page 403: ...HYBRID INFORMATION ...
Page 424: ......
Page 425: ...STARTING AND DRIVING ...
Page 484: ......
Page 485: ...SOUND MEDIA AND INTERNET ...
Page 539: ...WHEELS AND TYRES ...
Page 565: ...LOADING STORAGE AND PASSENGER COM PARTMENT ...
Page 577: ...MAINTENANCE AND SERVICE ...
Page 629: ...SPECIFICATIONS ...
Page 661: ......
Page 662: ...TP 25059 English Int AT 1746 MY18 Copyright 2000 2017 Volvo Car Corporation ...