wheel AUDI A4 2001 B5 / 1.G Technical Features Design And Function

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Introduction
Infinitely variable perfection
For the first time in this vehicle class, Audi
offers the infinitely variable "multitronic"
automatic gearbox for all front-wheel drive
versions.
The architecture of motion
Performance and smooth running
The engine programme of the new Audi A4
includes two petrol engines of a completely
new design, with aluminium housings.
The 2.0 litre 4-cylinder in-line engine with
96 kW (130 PS) and the 3.0 litre V6 with
162 kW (220 PS) fulfil the EU 4 emissions
standard.
A high degree of running smoothness is
achieved via balancer shafts.
The new light alloy running gear
With the four-link front axle, each wheel is
controlled by four aluminium transverse links.
The pivot bearings are also made from the
same light alloy.
The trapezium link rear axle for the quattro
drive system is also used in the front-wheel
drive models of the Audi A4.

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High safety standards
With a thoroughly optimised body design and
comprehensive safety equipment, the new
Audi A4 is able to comply with all current valid
safety standards, throughout the world.
Crash sensors for the front airbags integrated
directly into the bumper bar, improve occu-
pant protection.
Finely-tuned aerodynamics
Despite the greater frontal area and the cool-
ing air current for the air conditioner (stand-
ard), it was possible to improve the C
D

value
by 5 %, in comparison to its predecessor,
to 0.28.
A special feature is the so-called aero-floor,
which provides for optimal airflow on the
underside of the vehicle.
Communication centre on wheels
With regard to infotainment, the new
Audi A4 leaves nothing to be desired.
4 different audio systems, 2 differently config-
ured Navigation systems and a car phone
with voice operation are on offer.
Electronic stability programme (ESP)
including brake assistant
For the latest ESP generation, the hydraulic
brake assistant is an integral part of the
standard equipment.
It is intended to assist the driver by automati-
cally increasing the brake pressure during
emergency braking.
SSP254_048

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The aero-floor
not only contributes to improved aero-
dynamics.
It was also possible to reduce the noise level
by approx. 3 dB (A).
The engine compartment noise insu-
lation does not form part of the aero-
floor. Part of the additional costs generated by the
aero-floor could be compensated by dispens-
ing with certain panelling components as
well as by dispensing with PVC protection of
the underside of the vehicle. The latter is of
advantage during recycling.The aero-floor was designed so as to guaran-
tee ground clearance and resistance to stone
impact and to prevent accumulation of dirt,
stones and snow.
Front-wheel drive
Four-wheel drive quattro and V6 engine
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P
R+NDS

Innovations - automatic
gearbox
5-speed 01V automatic gearbox
The Audi A4 quattro MJ01 with 5-speed auto-
matic gearbox features a new shift lever gate,
together with a new shifting concept.
The existing selector lever positions, 4,3,2 are
discontinued and are replaced by the "S"
position.
Gearshift positions 4,3,2 have been discontin-
ued as they are hardly ever used in practice.
The DSP (dynamic shift programme) and "tip-
tronic" function have basically rendered them
superfluous.
With the selector lever is in the "S" position, a
sports shift programme provides the relevant
driving dynamics. In position "S", the DSP
also provides for adaptation of the driving set
values to the driving conditions.
The introduction of the "S" programme ena-
bles a significant extension of the useful shift
range between economy and sports.
The "S" programme comprises the following
special features:
– If, during driving with constant accelerator
pedal position, the selector lever is set to
the "S" position, the system always shifts
down, within defined limits.
– In order to achieve a direct driving reaction
in response to accelerator pedal actuation,
the converter clutch is closed during driv-
ing operation, where possible.
– If, in conjunction with the overall gearbox
ratio, 5th gear is designed as overdrive
gear (overdrive, 4+E), only 1st -4th gears
are shifted.
We recommend the multi-function steering
wheel (available as optional extra) with steer-
ing wheel "tiptronic" ("thumb shifting").
Gearbox output speed [rpm]
Throttle valve angle [%]

SSP254_103 SSP254_117
D - normal driving programme
S - sports driving programmeExample: Dynamics code 40
Shift map 1

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Special feature:
The countdown from approx. 10 seconds to
return to normal automatic operation is inter-
rupted, in the event that cornering is detected
or the vehicle is in overrun operation.
When normal driving conditions are detected
again, the countdown recommences from
approx. 10 seconds. An innovation for all automatic gearboxes is
the "Tip in D " function. This means that the
steering wheel "tiptronic" function is now
also available in selector lever position "D".
The transition to the "tiptronic" function is
effected by actuating one of the two tip
switches on the multi-function steering wheel
(selector lever in position "D"). The system
then switches to the "tiptronic" function for
approx. 10 seconds. All gears can be shifted
within the range of permissible engine
speeds.
The system returns to normal automatic oper-
ation approx. 10 seconds after the last tip
request.
Engine and gearbox
"multitronic" and 5-speed automatic gearbox
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The suspension strut mounting is of the bulky
rubber bearing construction.
It consists of two functional components:
– The inner part forms the connection to the
piston rod.
– The larger outer part provides for acoustic
insulation of the shock absorber.
Axles
Four-link front axle
The thorough further development of the
light-weight construction resulted in a weight
reduction of approx. 8.5 kg at the front axle.
In addition to all transverse links, the pivot
bearing is now also made of aluminium.
The wheel bearing is attached to the pivot
bearing via four bolts. The wheel hub can be
pressed in and out.
Running gear
SSP254_087
Aluminium pivot bearing Aluminium mounting bracket
Aluminium
spring plate
Shock absorber valves
SSP254_086
SSP254_085

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The front-wheel drive version is fitted with a
wheel bearing unit with integral wheel hub,
which is mounted on a stub axle forged
together with the wheel carrier.
Trapezium link rear axle
The rear axle design with largely identical
components is used in both the front-wheel
drive as well as in the quattro versions.
The wheel bearings of the quattro version
consist of pressed-in, double-row angular ball
bearings with conventional wheel hubs.
SSP254_089
SSP254_091
Toe adjustmentCamber
adjustment
SSP254_082 SSP254_083
Apart from the axle mounting, the two axle
versions differ only in the wheel carrier and
the wheel bearings.
Toe adjustment
Camber
adjustment

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Electrical system
NOX sensor
(USA only) Diagnosis system
CAN BUS networking
The ignition switch signals and the
control buttons for multifunction
and "tiptronic" steering wheel are
registered via the steering column
electronics.
G85
J162J502
R99
J401

Gate-
way

J220
J234
J387 J386
J388 J389
J393 J217
J104
J453 J446
J402 E87
J519
J136 J345J526J499 J507
J527
J285
R94

TRACK
SEEK
CD CDC
AM
FM1DOLBY SYSTEM2
12
TA P EPLAY SDEBASS MIDDLE TREBLE BALANCE FADER123456
EJECTAudi symphony
AS
TP
RDS
RANDOM FR FF
TUNE SCAN
EJECT

R
J527

R
T+-

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CAN data bus
The Audi A4 is equipped with a widely
extended CAN data bus system.
Due to the ever increasing number of control
units installed in the vehicle and the associ-
ated requirement for data exchange, the
importance of the CAN data bus system
increases significantly.For communication between the
installed control units and the diagnos-
tic tester, two diagnosis wires (K and L)
are available.
The newly developed adapter VAS 6017 ena-
bles communication with all control units.
Drive BUS 500 kBaud
Convenience BUS 100 kBaud
Display BUS 100 kBaud
Diagnosis connection
K wire
Diagnosis connection
L wire (2nd K wire)
J402 Control unit for operating electronics,
navigation, TV tuner
J446 Control unit for parking aid
J453 Control unit for multi-function
steering wheel
J499 Control unit for telematics
J502 Control unit for tyre pressure monitor
J507 Control unit for speech entry
J519 Control unit for vehicle electrical
system
J526 Control unit for telephone -
permanent installation
J527 Control unit for steering column
electronics
R Radio
R94 Interface for navigation
R99 Chip card reader G85 Steering angle sender
E87 Operating and display unit for
air conditioner
J104 Control unit for ESP
J136 Control unit for seat adjustment with
memory, optional
J162 Auxiliary heater, optional
J217 Control unit for automatic gearbox
J220 Control unit for motronic
J234 Airbag control unit
J285 Control unit with display unit in
dash panel insert
J345 Control unit for trailer recognition
J386 Door control unit, driver’s side
J387 Door control unit, passenger side
J388 Rear left door control unit, optional
J389 Rear right door control unit, optional
J393 Central control unit for convenience
system
J401 Navigation system control unit
SSP254_112

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Electrical system
Steering column switch
module
Due to the compact design of the newly
developed steering column switch module, it
was possible to minimise the amount of wir-
ing necessary and the space requirements.
A self-diagnosis facility for the steering col-
umn switch is now available with new switch
module.
The steering column switch module consists
of the following components:
– Turn signal switch
– Wiper switch with interval potentiometer
– Separate steering column switch cruise
control system operation
– Coil spring for diver's airbag
– Steering angle sensor for ESP
– Steering column electronics for signal con-
version and processing of drive and con-
venience CAN BUS J527
In addition, the steering column electronics
register the ignition switch signals.
Furthermore, the control buttons for multi-
function and "tiptronic" steering wheel are
registered via the steering wheel electronics
module.
Steering column switch
Detection of the respective switch positions is
effected via voltage coding, using various
resistance values in the relevant position. The
steering column electronics evaluates this
switch information and transmits it, via the
convenience CAN BUS, to the vehicle electri-
cal system control unit J519.
Cruise control system (CCS)
For ergonomic reasons, the control switch for
the cruise control system is located on the
left side of the steering column, below the
turn signal lever.
Warning lamp K31 in the dash panel insert
illuminates when the CCS is in control mode.
The modified operation of the CCS Steering
column switch function is described in the
Owner's Manual.
Cruise control
system E45
Ignition
steering lock Steering column
electronics J527
Turn signal
switch E2
SSP254_105