Audi TT (2007 year). Manual - part 240

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

41

Coding

The coding tells the control unit the system variant, 
powertrain type, gearbox type, wheel size and type 
of tyre used on the vehicle. The control unit accepts 
the new coding after ignition on/off.

Tyre type and size (16"-18", standard tyre, SST tyre)

Powertrain type (front, quattro, gearbox variant)

6

 = PR No. 7K6 (= low tyre pressure indicator)

Data blocks

The data blocks are used to check key system status 
information. 

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

42

Wheels and tyres

Function diagram

381_057

Positive

Earth

Powertrain CAN bus

Input signal

Output signal

J793

Tyre pressure monitor control unit 2

J104    ESP control unit
E492  Tyre pressure monitor display button

A

Signal from wheel speed sensor, rear right

B

Signal from wheel speed sensor, rear left

C

Signal from wheel speed sensor, front right

D

Signal from wheel speed sensor, front left

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

43

CAN data exchange

381_058

J793 Tyre pressure monitor control unit 2
System status (all)
Activation of warning lamp, text display (7,6)

J533 Diagnostic interface (7) 
Date, time
Terminal 15 -counter
Mileage (km)
Reversing light switch
Trailer detected

J285 Control unit with display in dash panel 
insert (6)
Displayed vehicle speed
Handbrake activated
Error status, ambient temperature

J220 Motronic control unit (1)
CCS status
Clutch switch
Coolant temperature 
Engine torque
Engine speed
Gearbox variant

J104 ESP control unit (2)
ESP system status 
ABS active
EBD, EDL and ESP intervention
TCS and EBC request
TCS shift control
Brake light sensor
Lateral acceleration
Yaw rate

J527 Steering column electronics control unit (3)

G85 Wheel angle sender 
max. steering angle

J217 Automatic gearbox control unit (4)
Selector mechanism active
Target gear or selected gear
Selector lever position/driving program
Torque converter lock-up clutch

J492 Four-wheel drive control unit (5)
Error status
Clutch open
Clutch torque
Clutch stiffness

Information sent by control unit J793

Information received and evaluated by 
control unit J793

Powertrain CAN bus

Dash panel insert CAN bus

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not 
 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability 
     with respect to the correctness of information in this document. Copyright by AUDI AG.

44

Wheels and tyres

Overview

The Audi TT for the North American market uses an 
improved version of the tyre pressure monitoring 
system as featured previously in the Audi A6 (USA) 
.It is a direct measuring system with tyre pressure 
sensors in the wheels.

381_059

J533

J502

E492

J285

G222

Dash panel insert CAN

Powertrain CAN bus

G223

G224

G225

J285

Control unit with display in dash panel insert

J533 

Data bus diagnostic interface

J502

Tyre pressure monitor control unit

E492

Tyre pressure monitor display button

G222-225

Tyre pressure sensors

Tyre pressure monitoring system (US spec)