2003 SAAB 9-3 wheel torque

144 Starting and drivingTraction Control
System (TCS)Anti-spin system
How the system worksThe Traction Control System (TCS) is
designed to prevent wheelspin. This
enables the car to achieve the best possible
grip and, hence, maximum tractive effort,
together with greater stability.
The TCS uses information from the ABS
wheel sensors to detect when the front (driv-
ing) wheels are rotating faster then the rear
wheels. It then monitors whether one driving
wheel is rotating faster than the other. If so,
the faster wheel is retarded until both
wheels are rotating at the same speed.If the two front wheels are rotating at the
same speed but are turning faster than the
rear wheels, the torque from the engine is
reduced to eliminate the difference.
The process continues until all the wheels
are rotating at the same speed.
The advantages of the TCS become most
apparent when the cohesion between the
front wheels and the road surface is so low
that one or both of the wheels would lose
their grip were the car not equipped with the
TCS, e.g.:
 When the car is pulling away or accelerat-
ing with the front wheels on different
surfaces (e.g. one slippery and one dry),
the TCS functions like an electronic differ-
ential lock, making sure that both wheels
rotate at the same speed.
 When the car is pulling away or accelerat-
ing on a slippery surface, in which case
the system eliminates wheelspin. The
system also functions when the car is
reversing.
 When cornering, if the inside front wheel
rotates faster than the other wheels.
TCS OFF
lights up under the speedometer if:
 a fault has been detected and the system
has therefore been switched off
 there is a fault in the ABS system
 the system has been switched off
manually.
WARNING
When driving normally, the TCS system
helps to improve the car’s directional
stability. The TCS must not be regarded
as a system to enable the driver to main-
tain higher speeds. The same precau-
tions must be adopted as normal for safe
cornering and driving on slippery roads.
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159 Starting and driving
Recommendations for cars with
manual transmissionRises in coolant temperature are indicated
by the temperature gauge in the main instru-
ment panel.
When the needle is just outside the red
zone, the A/C compressor will be switched
off and, on certain engine variants, the max-
imum engine torque will be limited.
When continuing your journey, select a low
gear in which the engine speed is about
3,500 rpm until the incline eases.
Trailer hitch loadThe weight distribution on the trailer makes
a lot of difference to the handling properties
of the car and trailer combination. As
regards two-wheel trailer, concentrate the
load over the wheels and keep it as low as
possible.
The trailer should be loaded so that the load
on the towball is 110–165 lbs. (50–75 kg).
Note that this load must be included in the
total load for the car. If this now exceeds the
specified load capacity, the load in the trunk
may have to be reduced by the correspond-
ing amount.
WARNING
Remember to use engine-braking (selec-
tor position 1, 2, or 3) to spare the brakes
when you are driving on a long or steep
downhill slope.
Overheating can cause the brakes to
fade!
Distribution of load in traileraLight
b Moderate
cHeavy
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214 Car careChanging a wheel
WARNING
 The car jack is designed solely for use
in changing a wheel or fitting snow
chains. It must not be used to
support the car during repair work
or servicing.
Never crawl under a car that is
supported only by a jack.
 Special care must be taken if the car is
on a slope - use wedge-shaped wheel
chocks!
 Position chocks, one ahead and one
behind, the wheel that is diagonally
opposite to the one to be changed.
 Switch on the hazard warning lights if
the car is on a road.
 Apply the parking brake and leave the
car in gear (1st or reverse). Automatic
transmission: move the selector lever
to the P position.
 Ensure that everybody is out of the car
before jacking it up.
 Never start the engine while the car is
jacked up.
 If possible, make sure the jack is
standing on a firm, level surface.
 The jack should be stored correctly
under the carpeting in the trunk. If it
lies loose in the car, it could thrown
forward and cause personal injury in
the event of a crash or if the car rolls
over.
 Do not use the jack on a car other than
your Saab 9-3.
 Grit, salt and rust can clog the inner
threads if the car has been driven for
several years exclusively with alloy
wheels.
If steel wheels are now fitted, the bolt
hole threads in the brake hubs should
be cleaned before the thinner steel
wheels are fitted. It may otherwise not
be possible to achieve the correct
clamping force, despite tightening the
wheel bolts to the correct torque.
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215 Car care
When the car has to be lifted, the jack must
be positioned at one of the four jacking
points (front or rear) under the sill members.
If a floor jack is used, the lifting plate must
be positioned under the normal jacking
points. If the car is equipped with a towbar,
the jack can also be placed under this.
1 Apply the parking brake and engage 1st
or reverse gear (automatic transmis-
sion: select P).
2 Wind the jack up to a suitable height
before placing it under the jacking point.
Each jacking point is indicated by an arrow on the sill (see illustration).
Make sure that the jack fully engages
the jacking point in the underside of the
sill member and that the entire foot of the
jack is steady and flat on the ground.
The jack must not stand on snow, ice or
similar.
Wind up the jack until it just begins to lift
the car.
3 It is not necessary to remove the wheel
cover.
If, none the less, you wish to remove the
wheel cover, take hold of the outer edge
and pull it straight out.
Loosen the wheel bolts half a turn.
4 Wind the jack to raise the wheel clear of
the ground. Remove the wheel bolts and
lift off the wheel.5 Clean any rust or dirt from the contact
surfaces between the wheel and brake
disc. Do not wipe away the grease in the
wheel hub.
6 Fit the wheel and screw in the bolts in the
sequence shown on the following page
(opposite pairs).
Tighten the bolts enough for the bolts
and wheel to be seated correctly.
7 Lower the car and tighten the wheel
bolts to torque in sequence as shown on
the following page.
Tightening torque:
Light-alloy wheels: 110 Nm.
Steel wheels: 110 Nm.NOTICEApply the jack only to the jacking points
indicated on the body.
Jacking points
Marking of jacking points
Clean any rust or dirt from the contact sur-
faces between the wheel and brake disc.
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216 Car care8 Retighten the wheel bolts after twenty or
so miles.
Tightening torque:
Light-alloy wheels: 110 Nm.
Steel wheels: 110 Nm.We advise against using wheels with large
ventilation slots in winter, as the brake com-
ponents are then more exposed to slush,
road salt and grit.
If you fit wheels of a different dimension, the
speedometer can be reprogrammed to
ensure it is as accurate as possible. Contact
a Saab dealer.
Driving with tire chains, see
page 156 NOTICE
 Do not overtighten the bolts using a
impact wrench: not only can this
damage the wheels but it can also
make it impossible to undo the bolts
using the wheel wrench in the car’s
toolkit.
 When refitting a wheel cover, make
sure that the valve protrudes through
the marked recess in the wheel cover.
Tightening sequence, wheel bolts
Do not wipe away the grease in the wheel
hub.
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254 IndexRemote control
_________________ 38
Remote locking malfunction
_______ 40
Reporting safety defects
_________ 233
Rev counter
___________________ 59
Reversing lights ________________ 76
Roof lighting
__________________ 105
Roof lighting, changing
__________ 196
Running-in
___________________ 132
SSAHR, head restraint
____________ 20
SID
__________________________ 64
SPA _________________________ 151
Saab Information Display
_________ 64
Saab Parking Assistance ________ 151
Saab Trionic engine
management system
__________ 174
Safety belts
____________________ 11
Seatbelts
______________________ 11
Seatbelts, care
________________ 217
Seatbelts, checking
_____________ 217
Seats
_________________________ 16
Securing a load
________________ 118
Sentronic, manual gear selection
__ 139
Service costs
_________________ 232
Service information
_____________ 232
Service intervals
_______________ 230
Service record retention
_________ 231
Shifting the wheels
_____________ 209
Signalling, horn
_________________ 98Ski hatch
_____________________ 117
Spare wheel __________________ 212
Speed ratings, tyres
____________ 209
Speedometer
__________________ 60
Starting the engine
_____________ 123
Steering wheel adjustment
________ 98
Steering wheel lock
_____________ 123
Storage compartments __________ 109
Sun visor
_____________________ 106
Sunroof
______________________ 102
Switches ______________________ 72
TTCS
_________________________ 144
Technical data
_________________ 236
Textile carpeting, cleaning
_______ 218
Tightening torque, wheels ________ 216
Tools and spare wheel
__________ 212
Touching up paintwork __________ 219
Towbar
______________________ 157
Towbar load
__________________ 159
Towing
______________________ 164
Towing a trailer
________________ 157
Towing the car ________________ 165
Traction Control System (TCS)
____ 144
Transmission oil, checking
_______ 178
Transmission oil, grade
__________ 241
Transmission, automatic _________ 134
Transmission, manual
___________ 133
Transporting the car
____________ 166Trip computer
__________________ 65
Trip meter
_____________________ 59
Trolley jack ___________________ 215
Troubleshooting, A/C and ACC
____ 224
Turbo gauge
___________________ 61
Tyre date code ________________ 212
Tyre markings
_________________ 209
Tyre pressure _________________ 207
Tyre pressure monitoring, automatic
207
Tyre sizes
____________________ 243
Tyres
________________________ 206
UUpholstery care
________________ 217
Upholstery, cleaning
____________ 217
Useful tips on night driving
_______ 163
Useful tips on starting petrol engines
125
VVanity mirror
__________________ 106
Vehicle identification number
_____ 246
Vehicle recovery
_______________ 166
WWarning labels
___________________ 7
Warning lights __________________ 54
Warning triangle ________________ 76
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