traction control VOLVO XC90 T8 2017 Owner´s Manual

WHEELS AND TIRES
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479
Uniform Tire Quality Grading
ALL PASSENGER VEHICLE TIRES MUST CONFORM TO FEDERAL SAFETY REQUIRE-MENTS IN ADDITION TO THESE GRADES .
Quality grades can be found, where applica- ble, on the tire sidewall between the treadshoulder and maximum section width. Forexample: Treadwear 200 Traction AA Temperature A
TREADWEARThe treadwear grade is a comparative rating based on the wear rate of the tire when testedunder controlled conditions on a specified gov-ernment test course. For example, a tire graded150 would wear one and one half (1 ½) times aswell on the government course as a tire graded100. The relative performance of tires dependsupon the actual conditions of their use, however,and many depart significantly from the norm dueto variation in driving habits, maintenance practi-ces and differences in road characteristics andclimate.
TRACTIONThe traction grades, from highest to lowest, areAA, A, B, and C, as measured under controlledconditions on specified government test surfacesof asphalt and concrete. A tire marked C mayhave poor traction performance. The tractiongrade assigned to this tire is based on braking (straight-ahead) traction tests and is not a meas-ure of cornering (turning) traction.
WARNING
The traction grade assigned to this tire is based on braking (straight-ahead) tractiontests and is not a measure of cornering (turn-ing) traction.
TEMPERATUREThe temperature grades are A (the highest), B, and C, representing the tire's resistance to thegeneration of heat and its ability to dissipate heatwhen tested under controlled conditions on aspecified indoor laboratory test wheel. Sustainedhigh temperature can cause the material of thetire to degenerate and reduce tire life, and exces-sive temperature can lead to sudden tire failure.The grade C corresponds to a minimum level ofperformance that all passenger vehicle tires mustmeet under the Federal Motor Safety StandardNo. 109. Grades B and A represent higher levelsof performance on the laboratory test wheel thanthe minimum required by law.
WARNING
The temperature grade for this tire is estab- lished for a tire that is properly inflated andnot overloaded. Excessive speed, under-infla-tion, or excessive loading, either separately orin combination, can cause heat buildup andtire failure.
Snow tires and chains
The use of snow chains and/or winter tires can help improve traction in winter driving conditions.
Snow chains can be used on your Volvo with the following restrictions:
• Snow chains should be installed on frontwheels only. Use only Volvo approved snowchains.
• If accessory, aftermarket or "custom" tiresand wheels are installed and are of a size dif-ferent than the original tires and wheels,chains in some cases CANNOT be used.Sufficient clearances between chains andbrakes, suspension and body componentsmust be maintained.
• Some strap-on type chains will interfere withbrake components and therefore CANNOTbe used.
• All Wheel Drive models
: Snow chains
should only be installed on the front wheels.
• Certain size tires may not allow the assemblyof snow chains/traction devices.
Consult your Volvo retailer for additional snowchain information.

INDEX
573
Stability system 259
sport mode 260
Start and lock system type designations 256
Starting and driving 362
Starting the engine 390Starting the vehicle after a crash (crash mode) 78
Start inhibitor (immobilizer) 232
Steel grid in cargo area 223
Steering wheel 164 adjusting 165
heated 206
horn 164
keypad 164
Steering wheel paddles 164
Stone chips, touching up 547, 548
Storage compartments 218
Studded tires 479Sunroof laminated panoramic roof 108, 109
Sun shade 111, 113
Sun visor 227
Suspension 419
System updates 500
T
Tailgate locking/unlocking 246
locking/unlocking (private locking) 250operating with the foot movement sen-
sor 240
power operated 248
wiper/washer 163
Tailgate wipers 538
Technician certification 58Temperature perceived 186
Temperature sensor ambient 118
Tethering wi-fi sharing 462
Three-way catalytic converter 381Timer preconditioning 190
Tire inflation pressure 563
Tire Pressure Monitoring System 485, 488 calibrating 489
Tire Pressure Monitoring System (TPMS) 489
Tires 472, 482 changing 481
changing from summer to winter 477
glossary of terms 476
improving economy 472
inflation pressure 480
inflation pressure table 563installing (mounting) a wheel on the
vehicle 485
rotation 473
snow 479
specifications 474
storing 473
studded 479
tire pressure monitoring system 485, 488
tire sealing system 490, 492, 495
tread wear indicator 477
uniform tire quality grading 479
wheel bolts 483
Tire sealing system 490, 492, 495 Top tether anchors (child restraint sys- tems) 91
Touching up paint 547, 548
Towbar 387
Towing a trailer 384, 388 trailer hitch 387
Towing eyelet 376
Towing the vehicle 377
Traction control 259
Trailer hitch 387