Manual Saab 9-3 - 2009 (page 173 of 304) (English)

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173Starting and driving

All-wheel drive (XWD) 3

Essentially, the system consists of a PTU

(Power Take off Unit), propeller shaft, RDM

(Rear Drive Module which contains an elec-

tronically controlled plate clutch, final drive

gear and differential) and driveshafts. This

system enhances driving characteristics

and stability. The system is always active

and cannot be deactivated. It works

together with the ESP system and the

engine and transmission control modules.

When driving at a constant speed, approx.

95% of the torque is distributed to the front

wheels and approx. 5% to the rear wheels.

The torque is distributed steplessly and

instantaneously between the front and rear

wheels, depending on the driving condi-

tions. If the car is fitted with eLSD (electron-

ically controlled plate clutch between the

rear wheels), the torque can also be distrib-

uted individually to the relevant rear wheel.

For optimum system function, the car’s tires

should not have varying degrees of wear.

When the XWD system requires service,

the following message is shown on the SID:

When the service message is displayed,

the XWD system may have limited func-

tionality (or be completely disabled in

some cases, i.e. the car switches to

front-wheel drive). Contact a workshop

for information. We recommend that you

contact an authorised Saab dealer.

Traction Control

System (TCS)

Anti-spin system

How the system works

The 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 system uses information from the

ABS system’s wheel speed sensors to

determine whether any wheel is spinning. If

any wheel is spinning, this is reduced on

all-wheel drive cars initially by changing the

torque distribution, secondly by reducing

the engine torque, and thirdly with the aid of

the wheel brakes. On front-wheel drive cars,

wheelspin is reduced initially by reducing

the engine torque, and secondly with the aid

of the wheel brakes.

Service XWD.

WARNING

When driving normally, the TCS system

helps to improve the car’s stability, and

driveability under slippery road and

extreme driving conditions. The TCS

must not be regarded as a system to

enable the driver to maintain higher

speeds. The same precautions must be

adopted as normal for safe cornering and

driving on slippery roads.

93_US_MY09.book Page 173 Tuesday, April 15, 2008 10:30 AM

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Saab 9-3 - 2009 Manual

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