The OBZ 7-speed Dual Clutch S tronic
Transmission in the 2017 R8
Self Study Program 950173

Audi of America, LLC
Service Training
Created in the U.S.A.
Created 11/2016
Course Number 950173

©2016 Audi of America, LLC
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Always check Technical Bulletins and the latest electronic service repair
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in this booklet.

Revision:11/2016
ii

Introduction ....................................................................................... 1
Overview ..................................................................................................................................................................... 2

Selector mechanism............................................................................ 4
Component overview ................................................................................................................................................. 5
Selector lever longitudinal lock ................................................................................................................................ 8
Selector lever transverse lock ................................................................................................................................... 9

Transmission functions......................................................................12
Auto-P function ........................................................................................................................................................ 12
Tip-shifting in D/S .................................................................................................................................................... 12
Activating transmission setting N (holding P-OFF setting) ................................................................................. 12
Launch control program ......................................................................................................................................... 12
Special features of the 2017 R8 ............................................................................................................................. 13
Audi drive select – transmission settings .............................................................................................................. 14

Gearbox assemblies...........................................................................16
Specifications ........................................................................................................................................................... 16
Overview and features ............................................................................................................................................. 16
Component overview ............................................................................................................................................... 20
Gear set/gear train configuration .......................................................................................................................... 22
Dual clutch ............................................................................................................................................................... 24
Gear train and gear set ........................................................................................................................................... 28
Gear shifting and gear-shift actuators .................................................................................................................. 30
Power transmission path in gearboxes ................................................................................................................. 32
Parking lock – mechanical function ....................................................................................................................... 36
Parking lock – electro-hydraulic function .............................................................................................................. 38
Parking lock emergency release ............................................................................................................................. 44
Oil system and ATF supply ...................................................................................................................................... 46
Oil level ..................................................................................................................................................................... 48
Lubrication and cooling of the gear train .............................................................................................................. 50
ATF temperature management .............................................................................................................................. 52

Transmission control.........................................................................54
Component overview ............................................................................................................................................... 54
Dual-Clutch Transmission Mechatronic ................................................................................................................. 56
Auxiliary hydraulic module ..................................................................................................................................... 62
Parking lock module ................................................................................................................................................ 63
Transmission control modules ............................................................................................................................... 65
Sensors and information ........................................................................................................................................ 66
Function diagram .................................................................................................................................................... 72
Hydraulic circuit diagram ........................................................................................................................................ 74

Knowledge assessment.....................................................................76

The eSelf-Study Program (eSSP) teaches a basic understanding of the design and mode of operation of new models, new
automotive components or new technologies.
It is not a repair manual! Figures are given for explanatory purposes only and refer to the data valid at the time of
preparation of the SSP.
This content is not updated.
For further information about maintenance and repair work, always refer to the current technical literature.

Note

Reference
iii

iv

Introduction
The new 0BZ S tronic 7-speed dual clutch transmission is a
truly sport-oriented gear box. Shifting occurs virtually
without interrupting the power transmission.

To review the basic functions of a dual clutch transmission
with electro-hydraulic controls, please refer to eSelf-Study
Program 951403, The 02E Direct Shift Gearbox, Design and
Function.

The seven speeds provide a wide spread of ratios which
reduce fuel consumption while retaining a close ratio configuration for better acceleration. It offers agility and easy
gear shifting to meet customer expectations in terms of
handling dynamics and driver convenience.

643_002

Learning objectives of this eSelf-Study Program:
After you have completed this eSelf-Study Program, you will be able to answer the following questions:
›› What is the design of the 0BZ 7-speed dual clutch transmission?
›› How does the 0BZ 7-speed dual clutch transmission function?
›› How does the 0BZ 7-speed dual clutch transmission differ from the dual clutch transmission we are already familiar with?

1

Overview
The OBZ 7-speed dual clutch transmission is being offered
for the first time in the North American market on the
2017 Audi R8.

The drive response and handling dynamics can be varied
using Audi drive select to suit the driver’s preference. See
page 14.

The power to the front wheels on the 2017 R8 is via the
new OD4 front final drive with an electro-hydraulic multiplate clutch. For more information about this final drive,
please refer to eSelf-Study Program 950163, Front Final
Drive OD4 Design and Function.

Automatic Transmission Control Module 2
J1006

2

0D4 front final drive with electro-hydraulically
controlled multi-plate clutch eSee Self-Study
Program 950163, Front Final Drive OD4 Design
and Function for more information.

643_012

All Wheel Drive Control Module J492

Selector mechanism

Parking lock emergency
release mechanism

643_003
3

Selector mechanism
Basic shift schematic
The Audi R8 uses the latest-generation Audi B and C series
selector mechanism with full "shift-by-wire" functionality.

Possible positions of the selector lever.
The following indications are displayed in
the self-diagnosis sequence according to
the selector lever position:

The operating concept is intuitive and is essentially identical to the familiar operating logic of other Audi automatic
transmission models.

X - Normal position in automatic mode
T - Normal position in tiptronic mode

The parking lock is normally engaged and disengaged by
the Auto-P function but can also be engaged by the driver
using the P button. See page 12.

A1, A2, B1, B2, T+, and T- are the position
indicators in the selector lever position
shown in each case

After every operation, the selector lever returns to the
normal position of the automatic or tiptronic gate.
tiptronic gate

Shift schematic

Automatic gate

643_010

Positions selectable without moving the selector
Selectable drive positions
Normal position of the selector lever and current drive position
Software lock: cancelled by pressing the release button – E681
Software lock: deactivate by pressing the foot brake1)
Mechanical lock by Shift Lock Solenoid N110
– cancelled by pressing Selector Lever Release Button E681
643_011

Note: An acknowledgement tone sounds when drive position
R is engaged.
tiptronic gate

Automatic gate
A2

A1

X

X
B1

B2

T

T+

T-

643_013

Speed-dependent transmission protection function
A change in driving direction from D to R and vice versa is only
possible at speeds less than approximately 5 mph (8 km/h).
At vehicle speeds above 5 mph (8 km/h), the transmission
safety function prevents the change.
643_012

1)

4

he orange-colored software lock is activated in drive position N after about one second. This allows quick-changing of the drive position from D to R and vice versa
T
without applying the brake. The makes it possible, to free a stuck vehicle by rocking it backwards and forwards and makes it easier to shift driving position when
maneuvering.

Component overview

Handle for selector lever top
section

Selector Lever Release Button
E681
Parking Lock Button E816
– P button –
Parking Lock Indicator Lamp
E3320

Handle for selector lever
bottom section with selector lever

Selector Lever
Transmission Range
Display Y5

Selector mechanism cover

Plug connection E
Selector lever

Plug connection C
Plug connection A
Selector mechanism
(Selector Lever
E313)

643_014

Selector Lever Release Button E681

Parking Lock Button E816

Button E681 is used for releasing the selector lever lock. It
consists of two shift elements for reliability and diagnostics. In the event of a fault, it is considered actuated.
The locks marked red and blue (Fig. 643_011) are disabled
and a DTC is recorded and then indicated on the instrument
cluster. The selector can be moved out of positions P and N
by pressing the foot brake.

The P button is for manually engaging the parking lock. The
parking lock can only be activated at vehicle speeds less than
0.5 mph (1 km/h). Button E816 has three shift elements for
reliability and diagnostics. Its shift status is transferred to
Selector Lever Sensor System Control Module J587 via two
interfaces. In the event of a fault in E816, a message appears
in the instrument cluster and the parking lock can only be
engaged by the Auto-P function.
5

Selector Lever Sensor System Control Module J587
J587 forms a functional unit with Selector Lever Position
Sensor G727 and Transverse Selector Lever Lock Sensor
G868.
It is responsible for detecting the driver input, analyzing the
button signals, communication with Gearbox Control Unit 1
J743, and all selector mechanism control and diagnosis
functions. It has the Address Word 81.
J587 registers the positions of the selector lever as shown in
Figure 643_010 (A2, A1, X, B1, B2, T+, T and T-) and the
signals from the buttons E681 and E816, and passes them on
to Gearbox Control Unit 1 J743 via the Drivetrain CAN.
Gearbox Control Unit 1 J743 determines the desired transmission setting and initiates the appropriate functional
operations.
It reports back the current transmission setting to the selector lever sensor module, and then operates Shift Lock Solenoid N110, the LEDs for Selector Lever Transmission Range
Display Y5 and Parking Lock Button K320.
When a transmission setting is selected, there is a brief delay
before the relevant transmission setting symbol lights up.

643_015

Selector Lever Sensor System Control
Module J587
Address Word 81

Schematic diagram of selector mechanism

Selector mechanism

Selector lever

643_016

VAS 642 001

CAN-High

The Y adaptor VAS 642 001 allows measurements to be taken
between Selector Lever E313 and Selector Lever Transmission
Range Display Y5.

CAN-Low

Information
If there is a system fault with the selector mechanism, the transmission ranges D and N can be selected by simultaneously pressing the
two tiptronic paddles when the vehicle is stationary and the brake applied. See page 13.
6

Selector Lever Position Sensor G727

How selector lever positions are detected:

J587 determines all selector lever positions by means of
Selector Lever Position Sensor G727. G727 consists of two
sensors – one sensor for the automatic gate and one sensor
for the tiptronic gate.

The longitudinal and transverse movements of the selector
lever are transmitted to a slider with two diamond-shaped
sender elements. The sender elements affect the magnetic
flux in the sensor elements of G727 according to the movement of the selector lever. From the sensor signals, Selector
Lever Sensor System Control Module J587 generates the
following selector lever positions:

Selector lever in automatic gate
B1

X

A1

›› Automatic gate
A2 – A1 – X (Normal position) – B1 – B2

A2

B2

›› tiptronic gate
T+ – T (Normal position) – TFor more details, see the shift schematic on page 6.
Slider with sender elements for
automatic and tiptronic gates

Circuit board containing Selector Lever Sensor System Control
Module J587, Transverse Selector Lever Lock Sensor G868 and
Selector Lever Position Sensor G727.

Plug connection A

Transverse Selector Lever Lock Sensor
G868
Selector Lever Position Sensor G727 for automatic gate
Magnet for G868

643_017

Selector Lever Position Sensor G727 for tiptronic gate

Basic position

Selector lever in tiptronic gate
Restriction of the selector lever movement to one position
forwards (T+) and one position backwards (T-) is achieved by
means of the tiptronic gate track of the position engagement
mechanism.
Key to schematic diagram of selector mechanism
on page 6
E313
E681
E816
G727
G868
J587
K320
N110
V577
Y5

T
T-

T+

Movement of the base plate together with
the slider and sender elements

Selector Lever
Selector Lever Release Button
Parking Lock Button
Selector Lever Position Sensor
Transverse Selector Lever Lock Sensor
Selector Lever Sensor System Control Module
Parking Lock Indicator Lamp
Shift Lock Solenoid
Transverse Selector Lever Lock Motor
Selector Lever Transmission Range Display

643_018

7

Selector lever longitudinal lock
In transmission setting D/S, Shift Lock Solenoid N110 is
energized and the locking pin engages with the selector
lever lock guide. The selector can now be moved back into
position B1 from the normal position in order to shift from D
to S or from S to D.

When Selector Lever Release Button E681 is pressed, the
power supply to N110 is disconnected and the lock is disengaged. To prevent unnecessary switching noises from N110,
it remains energized when switching to the tiptronic gate.
The lock preventing forward movement (A1) is inactive in the
tiptronic gate, however, because the lock guide is tilted to the
side it becomes ineffective.

Selector Lever Release Button
E681

Locking gate

Locking pin

Shift Lock Solenoid
N110
›› Energized in shifter positions D and S.

Cross-piece with locking groove
B2

Automatic gate of position engagement mechanism
›› The position engagement mechanism has 2 gate tracks, one
track for the automatic gate and one track for the tiptronic
gate.

B1

X

A1

A2

Basic position

8

643_019

Selector lever transverse lock
To ensure that the selector lever cannot be inadvertently
moved into the tiptronic gate, it is transversely locked in
transmission settings P, R and N.

Selector lever transverse lock active
The selector lever is held in the cross-piece. When the transverse lock is active, the locking cam is positioned so that it
engages in the locking groove of the cross-piece. When the
locking cam is in that position, the selector lever cannot be
moved into the tiptronic gate.

Transverse Selector Lever Lock Sensor G868

G868 uses Hall-effect sensors and a sensor magnet that is
located at the end of the roller. The sensor magnet affects
the signal of G868 according to the rotational position of the
roller. From that information Selector Lever Sensor System
Control Module J587 determines the position of the roller
and thus the status of the selector lever transverse lock.

Transmission setting P/R/N – selector lever transverse lock
active

Transverse Selector Lever Lock Motor V577

Worm gear

Reciprocating plate

Roller with swash plate,
locking cam and sensor magnet

Transverse Selector Lever Lock
Sensor G868

Magnet for G868

Cross-piece with locking groove

Locking cam

643_020
9

Selector lever transverse lock inactive

To be able to change to the tiptronic gate from transmission
setting D or S, the selector lever transverse lock has to be
deactivated.

Transmission setting D/S – selector lever transverse lock
inactive

Selector lever transverse lock cancelling function

1

2

Transverse Selector Lever Lock Motor V577 is operated by Selector Lever Sensor System Control Module
J587 until the locking cam is disengaged from the
locking groove of the cross-piece.
The cross-piece is then no longer locked and the
selector lever can be shifted into the tiptronic gate.

1
V577

Transverse Selector Lever Lock
Sensor G868

643_021

2
Locking cam

Roller with worm gear

Locking groove clear – the cross-piece and,
therefore, the selector lever can move sideways in the direction of the arrow – the
illustration shows the position of the selector lever in the automatic gate.

643_022

From the position of the magnet, the selector lever sensor module detects (with
the aid of the sensor G868) that the selector lever transverse lock is not active.

10

Selector lever transverse lock active

In transmission settings P, R and N the selector lever transverse lock is activated to prevent the selector lever unintentionally being shifted into the tiptronic gate..

Transverse Selector Lever Lock Motor
V577

To do so, Transverse Selector Lever Lock Motor V577 is operated by Selector Lever Sensor System Control Module J587
until the locking cam is engaged in the locking groove of the
cross-piece. From the position of the magnet, J587 detects
with the aid of G868 that the selector lever transverse lock is