2003 AUDI A8 torque

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Attention
NoteNew
Contents
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Passenger Protection
System layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Safety systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Engine, Mechanics
Technical data of V8 4.2 l 5V engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Technical data of V8 3.7 l 5V engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
System layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Electrohydraulic torque reaction support . . . . . . . . . . . . . . . . . . . . . . . . . 32
Exhaust system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Fuel tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Automatically controlled starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Running Gear
Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Rear axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
4-level air suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
System layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Electric parking brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Adaptive cruise control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Electrical System
Bus topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Convenience and security electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Lighting system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Heating/Air Conditioner
Design and operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Blower unit/air routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
System layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Block diagram for front air conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Block diagram for rear air conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
The Self Study Programme contains information on design
features and functions.
The Self Study Programme is not intended as a Workshop
Manual. Values given are only intended to help explain the
subject matter and relate to the software version applicable at
the time of SSP compilation.
Use should always be made of the latest technical publications
when performing maintenance and repair work.

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Engine, Mechanics
200040006000
40
60
80
100
120
140
160
180
200
220
240
260
280 300
320
340 360380 400
420 440
460
Technical data
V8 4.2 l 5V engine
Engine code
letters: BFM
Capacity:
3
Bore: 84.5 mm
Stroke: 93.0 mm
Compression
ratio: 11 : 1
Power: 246 kW (335 hp)
at 6,500 rpm
Torque: 430 Nm at 3,500 rpm
Camshaft
adjustment
range: 22° CS advance
Valves: 5 per cylinder
Engine
management: ME7.1.1
Emission
standard: EU 4
Firing
order: 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2
Capacities: 7.5 l engine oil (incl. filter)
Consumption: Urban: 17.5 - 17.6 l/100 km Non-urban: 8.7 - 8.8 l/100 km
Average: 11.9 - 12.0 l/100 km
Acceleration
0 - 100 km/h: 0 - 80 km/h – 4.8 s 0 - 100 km/h – 6.3 s
Fuel: Premium Plus Unleaded 98/95 RON
CS = Crankshaft
SSP282_002
SSP282_012
Engine speed [rpm]
P
ower [kW]
T
orq ue [Nm]
4,172 cm

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200040006000
260
280 300
320
340 360380 400
420 440
46040
60
80
100
120
140
160
180
200
220
240
V8 3.7 l 5V engine
Engine code
letters: BFL
Capacity:
3
Bore: 84.5 mm
Stroke: 82.4 mm
Compression
ratio: 11 : 1
Power: 206 kW (280 hp)
at 6,000 rpm
Torque: 360 Nm at 3,750 rpm
Camshaft
adjustment
range: 13° CS advance
Valves: 5 per cylinder
Engine
management: ME7.1.1
Emission
standard: EU 4
Firing
order: 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2
Capacities: 7.5 l engine oil (incl. filter)
Consumption: Urban: 17.1 - 17.3 l/100 km Non-urban: 8.6 - 8.8 l/100 km
Average: 11.7 - 11.9 l/100 km
Acceleration
0 - 100 km/h: 0 - 80 km/h – 5.6 s 0 - 100 km/h – 7.3 s
Fuel: Premium Plus Unleaded 98/95 RON
SSP282_001
SSP282_011
Engine speed [rpm]
P
ower [kW]
T
orq ue [Nm]
3,697 cm

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– Long intake path, 705 mm
– Changeover flap closed for high torque
Each of the two splined shafts is fitted with
four flaps per cylinder bank.
The shape of the rubber-encased flaps
ensures unimpeded air flow in the torque
position and reliable power position sealing
of the duct. This is a prerequisite for
utilisation of the gas-dynamic resonance
effects. In the power position, the backs of
the flaps take on the shape of the duct wall,
thus allowing low-resistance intake air flow
into the cylinders.
Mechanical couplings provide a link with the
vacuum units for adjustment of the two
shafts and thus the intake manifold flaps.
– Short intake path, 322 mm
– Changeover flap open for high power
with high air throughput
Changeover from long to short at 4,480 rpm
Changeover from short to long at 4,320 rpm
SSP282_014
SSP282_016
SSP282_015

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Hot-film air-mass meter G70
Engine speed sender G28
Hall sender G40 (bank 2) and
Hall sender 2 G163 (bank 1)
Lambda probe G39
(bank 1)
Lambda probe II G108
(bank 2)
Lambda probe after catalyst G130
(bank 1)
Lambda probe II after catalyst G131
(bank 2)
Throttle valve control
part J338 with
Throttle valve drive G186
(electric power control)
Throttle valve drive angle sender 1 G187
Throttle valve drive angle sender 2 G188
Coolant temperature sender G62
Knock sensor I G61 (bank 1) and
Knock sensor II G66 (bank 2)
Additional signals:
– Air conditioner requirement
– Cruise control switch
– Term. 50, stage 1
– Automatic gearbox selector lever positionEngine control unit J623
Steering
angle sender G85
ESP
control unit J104
Dash panel
insert CANAutomatic
gearbox
control unit J217
Airbag
control unit J234Intake manifold changeover valve
N156 and
Intake manifold changeover valve 2
N261
Left electrohydraulic engine mounting
solenoid valve N144 and
Right electrohydraulic engine mounting
solenoid valve N145
Torque rod valve N382
Lambda probe heater Z19
(bank 1) and
Lambda probe 2 heater Z28
(bank 2)
Lambda probe 1 heater
after catalyst Z29
Lambda probe 2 heater
after catalyst Z30
Additional signals:
– Starter relay term. 50, stage 2
– Tank leakage pump (USA only)
– Air conditioner compressor (out)Fuel pump relay J17
Fuel pump G6
Fuel pump II relay J49
Fuel pump G23
Injectors N30, N31, N32, N33 (bank 1)
Injectors N83, N84, N85, N86 (bank 2)
Ignition coils N (no. 1 cyl.), N128 (no. 2 cyl.),
N158 (no. 3 cyl.), N163 (no. 4 cyl.)
Ignition coils N164 (no. 5 cyl.), N189 (no. 6 cyl.),
N190 (no. 7 cyl.), N191 (no. 8 cyl.)
Activated charcoal filter system solenoid
valve 1 N80
Secondary-air pump relay J299 and
Secondary-air pump motor V101
Secondary air inlet valve N112
Throttle valve control part J338
With throttle valve drive G186
Inlet camshaft timing adjustment valve 1
N205 (bank 1)
and
N208 (bank 2) Pedal position sender/accelerator
pedal module with accelerator pedal
position sender G79 and accelerator
pedal position sender 2 G185
Brake light switch F and
Brake pedal switch F47
Clutch pedal switch F36
(manual gearbox only)
Control unit with display in dash
panel insert J285Data bus diagnostic
interface J533
Engine, Mechanics
System layout
Actuators/sensors
SSP282_091 Drive system CAN
Diagnosis CAN

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Hot-film air-mass meter G70
Engine speed sender G28
Hall sender G40 (bank 2) and
Hall sender 2 G163 (bank 1)
Lambda probe G39
(bank 1)
Lambda probe II G108
(bank 2)
Lambda probe after catalyst G130
(bank 1)
Lambda probe II after catalyst G131
(bank 2)
Throttle valve control
part J338 with
Throttle valve drive G186
(electric power control)
Throttle valve drive angle sender 1 G187
Throttle valve drive angle sender 2 G188
Coolant temperature sender G62
Knock sensor I G61 (bank 1) and
Knock sensor II G66 (bank 2)
Additional signals:
– Air conditioner requirement
– Cruise control switch
– Term. 50, stage 1
– Automatic gearbox selector lever positionEngine control unit J623
Steering
angle sender G85
ESP
control unit J104
Dash panel
insert CANAutomatic
gearbox
control unit J217
Airbag
control unit J234Intake manifold changeover valve
N156 and
Intake manifold changeover valve 2
N261
Left electrohydraulic engine mounting
solenoid valve N144 and
Right electrohydraulic engine mounting
solenoid valve N145
Torque rod valve N382
Lambda probe heater Z19
(bank 1) and
Lambda probe 2 heater Z28
(bank 2)
Lambda probe 1 heater
after catalyst Z29
Lambda probe 2 heater
after catalyst Z30
Additional signals:
– Starter relay term. 50, stage 2
– Tank leakage pump (USA only)
– Air conditioner compressor (out)Fuel pump relay J17
Fuel pump G6
Fuel pump II relay J49
Fuel pump G23
Injectors N30, N31, N32, N33 (bank 1)
Injectors N83, N84, N85, N86 (bank 2)
Ignition coils N (no. 1 cyl.), N128 (no. 2 cyl.),
N158 (no. 3 cyl.), N163 (no. 4 cyl.)
Ignition coils N164 (no. 5 cyl.), N189 (no. 6 cyl.),
N190 (no. 7 cyl.), N191 (no. 8 cyl.)
Activated charcoal filter system solenoid
valve 1 N80
Secondary-air pump relay J299 and
Secondary-air pump motor V101
Secondary air inlet valve N112
Throttle valve control part J338
With throttle valve drive G186
Inlet camshaft timing adjustment valve 1
N205 (bank 1)
and
N208 (bank 2) Pedal position sender/accelerator
pedal module with accelerator pedal
position sender G79 and accelerator
pedal position sender 2 G185
Brake light switch F and
Brake pedal switch F47
Clutch pedal switch F36
(manual gearbox only)
Control unit with display in dash
panel insert J285Data bus diagnostic
interface J533
Engine, Mechanics
System layout
Actuators/sensors
SSP282_091 Drive system CAN
Diagnosis CAN

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Electrohydraulic
torque reaction support
Engine, Mechanics
When the solenoid is deenergised, vibration
causes the plastic ring with sheet metal ring
and isolation diaphragm to oscillate as well.
The moments are damped slightly and thus
transmitted to a lesser extent to the body.
As of an engine speed of approx. > 1,100 rpm
and a vehicle speed of > 5 km/h, the solenoid
is energised and attracts the sheet metal ring
together with the plastic ring.
This restricts the movement of the isolation
diaphragm, which can then only vibrate
slightly. In this case there is a high level of
vibration damping and the torque reaction
support is "hard". The purpose of torque reaction support is to
cushion the drive shaft and propshaft torque.
The position of the support bearing at the
front right of the engine is ideal, as this is
where the engine motion resulting from drive
shaft and propshaft torque accumulates.
The torque reaction support is divided into
two halves by the plastic ring, the sheet metal
ring and the isolation diaphragm. Both halves
are filled with fluid (glycol). The isolation
diaphragm is flexibly linked to the plastic and
sheet metal rings.
If the torque reaction support is subjected to
load, the fluid can be displaced between the
top and bottom section by way of a
connecting pipe, the dimensions of which are
such that it acts as a restrictor as of a defined
frequency.
SSP282_020
Stress-free alignment of the torque reaction
support is implemented by way of the lock
nut.
Lock nut
Shell
Bellows cap
Bottom
sectionIsolation
diaphragm
Plastic ring with sheet metal ringUpper section of
nozzle plate
Solenoid Connecting
pipeTop section

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Two different versions are available:
– 420 Nm for the V8 5V 4.2 l or
3.7 l engine and
– 600 Nm for the V8 TDI 4.0 l or
6.0 l W12 engine To satisfy high comfort requirements, the
Audi A8 ´03 features a new 6-speed automatic
gearbox capable of handling a high engine
torque of max. 600 Nm.
Gearbox
Design and operation of the 09E gearbox
are described in SSP 283 (Part 1) and
SSP 284 (Part 2).
SSP282_043
Technical data
Designation: 09E
Factory
designation: AL 600-6Q
ZF
designation: 6HP-26 A61
Type: 6-speed planetary
gearbox, featuring electro-
hydraulic control
with hydrodynamic
torque converter and
slip-controlled lock-
up clutch
Control: Via mechatronic system
(integration of hydraulic
control unit and
electronic control
to form one unit)Max. torque
transmission: 420 Nm for
V8 5V 4.2 l /3.7 l engine
600 Nm for
V8 TDI 4.0 l /W12
6.0 l engine
Front/rear axle
torque distribution: 50/50
Gear oil capacity
(total): 10.4 litres ATF
Gear oil capacity
(replacement): 10 litres ATF
Total weight: approx. 138 kg
(420 Nm version)
approx. 142 kg
(600 Nm version)