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

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Service.
For internal use only. All rights reserved, including the
right to make technical changes.

AUDI AG
Dept. I/VK-5
D-85045 Ingolstadt
Fax 0841/89-36367
040.2810.73.00
Technical status 10/00
Printed in Germany

AUDI A4´01 - Technical Features
Design and Function
Self-study programme 254
254

254

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Advance by technology
The new Audi A4,
a vehicle which combines driving pleasure and good sense
with the highest level of quality and sports styling.
Control unit for vehicle electrical system
...48
New engine programme
...18
Electronic stability programme with
brake assistance
...32
Steering column switch module
...44
Crash sensors for front airbag
...14
Multi-communication bar
...72
Trapezium link
rear axle
...27
Aero-floor
...7

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Important:
Note
New

Contents
It is not intended as a workshop manual.
The self-study programme will provide you with information on
design and functions.
For maintenance and repair operations it is essential that you
refer to the current technical literature.
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Occupant protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Engine and gearbox
Running gear
Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Mechanical unit mountings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Brake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Brake assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
CAN BUS system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Dash panel insert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Steering column switch module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Function circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Control unit for vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Function circuit diagram for "lowline" version . . . . . . . . . . . . . . . . . . . . . 50
Function circuit diagram for "highline" version . . . . . . . . . . . . . . . . . . . . 52
Convenience system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Anti-theft alarm system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Radio - chorus II, concert II and symphony II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Navigation IV and Navigation Plus-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Multi-communication bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Electric logbook "Audi Logbook" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Heater/AC
Design and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
7-piston compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Air conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Glove compartment cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Solar roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Fresh air blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Actuators/sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Functional diagram for fully automatic air conditioner . . . . . . . . . . . . . . 84
Additional heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 2.0 l R4 and 3.0 l V6 engines (see SSP 255) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Innovations - 2.5 l V6 TDI engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Innovations - automatic gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electrical system

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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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6
977
1050870
9
5
1
257303
799445 L
2650
1526
4527
1088
1937
1528
1766
901
106/110
921976
976
471
14001357
1000
1628

Vehicle dimensions of Audi A4´01
Introduction
SSP254_051

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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
SSP254_053

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Body
Front impact design features
– the straightened longitudinal member with
crash-optimised octagonal cross-piece
– the rigid and significantly wider bumper
cross-piece
– the integration of the member structures
into the passenger cell
– strength, rigidity and weight-optimised
suspension strut cross-piece The new Audi A4 is designed for optimal con-
formance with current crash requirements
and safety standards.
This could only be achieved by increasing the
body weight.
In order to reduce this additional weight to a
minimum, the proportion of light-weight
materials has been increased in comparison
to its predecessor.
The proportion of high-strength sheet metal
parts as well as the use of a total of 10 large
component "tailored blanks", contribute sig-
nificantly to weight reduction.
Body rigidity has been increased by 45 % by
increasing the number of connection points
by 25 %.
Depending upon vehicle weight, performance and fuel consumption are the characteristics
which our customers can experience at first hand.
SSP254_054

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Side impact design features
In the floor area, the cell consists of three
large tailored blanks, which ensure a stable
connection between the front and rear of the
vehicle.
Weight-saving optimisation of deformation
characteristics in the event of a side impact
was achieved by the use of an aluminium
extruded profile in the sill.
“tailored blanks” are made-to-measure
sheet metal parts with varying material
thickness.

SSP254_055
SSP254_056

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Body
Doors
The doors of the Audi A4 demonstrate a sig-
nificantly increased rigidity due to the one-
piece door shell construction.
For the first time, a so-called spray-on noise
insulation is used, which is sprayed on as
required and allows weight reduction for the
same effectiveness.
The newly developed sub-frame is bolted to
the door shell via fitted bolts.
In addition, the doors have been fitted with a
second weatherseal. One weatherseal is fitted
to the door and the other is fitted to the body.
The new door concept permits a reduction in
the overall noise level of a further 3 dB (A) and
thus contributes to improving the aero-acous-
tics.
SSP254_066
SSP254_075SSP254_067
Noise insulation
Roof trim strip
Door window
seal
Door windo
w
Door frameDoor frame seal
Door trim
Door sealRoof