Electrical Equipment Audi TT 8N

General Information

OBD program text/data generated by control modules installed on vehicles from m.y. 2001 may not be recognized by VAG 1551/1552 Scan Tools (ST) with the latest program card. For example: scan tool display shows "text 799", "01529 /references" or similar.

In addition, OBD programs for vehicle electrical equipment updates implemented from m.y. 2001 may also not supported by VAG 1551/1552 Scan Tools (ST) with the latest program card. For example: Powertrain CAN-Bus function - adaptation and addition of Automatic Transmission coding/adaptation etc.).

Only the VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System is capable of processing all display text/data, as well as performing coding, adaptation and related OBD program functions on these vehicles.

OBD program functions on vehicles from m.y. 2001 must be performed using the VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding".

Application notes

The following OBD program information applies to instrument clusters on vehicles through m.y. 2000 only. OBD program information for instrument clusters from m.y. 2001. Refer to General Information .

Always confirm vehicle VIN and instrument cluster software version as per section title above. Confirm instrument cluster software version by initiating OBD program and reading information in display. Refer to Instrument cluster On Board Diagnostic (OBD), initiating .

In the event an instrument cluster was previously replaced in a vehicle with VIN up to 8N_Y040000, the new/replacement cluster may contain software version D26 which contains certain Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information that is not specifically covered in this section.

Information on replacement instrument clusters with software version D26 are contained in section "Interment cluster On Board Diagnostic (OBD) from VIN 8N_Y040001 and/or software versions from D26 &D03". Refer to Application notes .

The instrument cluster contains an electronic speedometer, tachometer, liquid crystal (LCD) displays for odometer, trip odometer, digital clock with date, as well as analog coolant temperature and fuel level gauges. Control and warning lamps are situated within the speedometer and tachometer faces.

A "Driver's Information System " LCD is located between the tachometer and speedometer. Displayed information includes an auto check system, outside air temperature, radio frequency and selectable trip computer functions.

The auto check system integrated with the Driver's Information System monitors the brake system, coolant temperature, fuel level, engine oil pressure, and displays the ambient temperature as a default.

The optional Navigation system display is also included in the Driver's Information System (where applicable).

The instrument cluster is controlled by a microprocessor and has extensive On Board Diagnostic (OBD) capability. If malfunctions occur in any of the system components, corresponding DTCs are stored in the Diagnostic Trouble Code (DTC) memory of the instrument cluster. DTCs are read and identified using VAG 1551 Scan Tool (ST), VAG 1552.Mobile Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding".

Note. The descriptions and displays in this section refer only to VAG 1551.

The following adaptation (adjustment) functions are also possible

1. Adapting fuel gauge sender resistance range
2. Adapting fuel consumption display
3. Coding of language versions for on-board computer and Auto Check system
4. Resetting service interval display
5. Setting distance/kilometer counter after replacing instrument cluster

Message "dEF" on trip recorder display

If the control module in the instrument cluster detects a malfunction in its permanent memory, the letters "dEF" will appear on the trip recorder display.

1. If "dEF" appears on the display, replace the instrument cluster. Refer to «Instrument cluster, removing and installing»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Notes on replacing instrument cluster

1. The instrument cluster must not be disassembled.
2. If necessary, the instrument cluster can be replaced with an exchange unit (where applicable).
3. Complete the damage report form and return it together with the malfunctioning instrument cluster.
4. Malfunctioning units must always be returned in their original packing.

1. Various input values must be adapted to replacement speedometer. Refer to «Replacement instrument cluster input values, adapting»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__replacement-instrument-cluster-input-values-adapting) .

Instrument cluster On Board Diagnostic (OBD), initiating

Additional information

1. Wiring Diagrams
2. Technical Bulletins

Scan Tool (ST) and test equipment safety precautions

Test requirements

1. Check fuses using wiring diagram
2. Always check coding of instrument cluster according to coding table. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__code-control-module-function-07)
3. Connect VAG 1551/1552 Scan Tool, VAS 5051 Vehicle Diagnostic, Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
4. Ignition switched on

Note. If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram. Additional operating instructions can be called up with the scan tool HELP button. The --> button serves to advance the program sequence. If an incorrect entry is made, press button C to escape. In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

1. Switch on printer with the Print button (indicator lamp lights up).
2. Press button -1- for "Rapid data transfer" mode.

Indicated on display

Address word for instrument cluster: 17

1. Press buttons -1- and -7- to select "Instrument Cluster" address word 17.

Indicated on display

1. Press -Q- button to confirm input

After about 5 seconds this display will appear (example only)

1. 8N1919930: Part Number of instrument cluster
2. KOMBIINSTR.+IMM (instrument cluster + immobilizer): component designation
3. M73: manufacturer's code (Magneti Marelli)
4. D15: software version installed in instrument cluster

1. Coding 06244: coding of instrument cluster
2. WSC XXXXX: Workshop Code

Note. Check coding according to coding table. Refer to Code Control Module (function 07) .

1. Press --> button.

If the display shows one of the messages reproduced here, run through the troubleshooting procedure as described in the wiring diagram.

Refer to Wiring Diagrams, Troubleshooting & Component Locations binder

Indicated on display

1. After the HELP button is pressed, a list of the possible functions is printed out.
2. Press --> button to advance the program sequence.

Note. The following OBD program information applies to instrument clusters on vehicles through m.y. 2000 only. OBD program information for instrument clusters from m.y. 2001. Refer to General Information .

On Board Diagnostic (OBD) functions

The following functions are possible

02 - Check DTC Memory. Refer to Diagnostic Trouble Code (DTC) memory, checking (function 02) .

03 - Output DTM. Refer to Output Diagnostic Test Mode (DTM) (function 03) .

05 - Erase DTC Memory. Refer to Diagnostic Trouble Code (DTC) memory, erasing (function 05) .

06 - End Output. Refer to End Output (function 06) .

07 - Code Control Module. Refer to Code Control Module (function 07) .

08 - Read Measuring Value Block. Refer to Read Measuring Value Block (function 08) .

10 - Adaptation. Refer to Adaptation (function 10) .

11 - Log-in Procedure. Refer to Adaptation (function 10) .

Diagnostic Trouble Code (DTC) Memory, checking (function 02)

Note. The displayed diagnostic information is not constantly up-dated, but only when starting the On Board Diagnostic (OBD) or with the function 05 "Erase DTC Memory."

1. Switch on printer with the Print button (indicator lamp in button lights up).

Indicated on display

1. Press buttons -0- and -2- to select "Check DTC Memory" function 02.

Indicated on display

1. Press -Q- button to confirm input

The number of stored DTCs appears in the display.

The stored DTCs are displayed and printed out one after the other.

1. Check printout against DTC table and repair all malfunctions as necessary. Refer to «Diagnostic Trouble Code (DTC) table»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__diagnostic-trouble-code-dtc-table) .

If "No DTC recognized" is displayed the program will return to the start point after pressing --> button.

Indicated on display

If something else is displayed

Refer to Scan tool operating instructions

1. End Output (function 06). Refer to «End Output (function 06)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__end-output-function-06) .
2. Switch off ignition and disconnect data link connector.

Diagnostic Trouble Code (DTC) table

Note. The following table lists all the malfunctions that can be recognized by the instrument cluster and printed out by the VAG 1551. The DTCs are listed in order according to their 5-figure code numbers. DTCs appear only on print-out. Before replacing a component shown as malfunctioning, check wiring and connections to the component as well as Ground connections according to the wiring diagram. After completing a repair and checking the function of the system, always check the Diagnostic Trouble Code (DTC) memory once again with the VAG 1551 scan tool and erase the memory. The Diagnostic Trouble Code (DTC) memory records all static and sporadic malfunctions. If a malfunction occurs and persists for at least 2 seconds, it is identified as a static malfunction. (In the case of the ambient temperature display, a malfunction must persist for at least 60 seconds before it is classified as a static malfunction; in the case of the coolant temperature sender, static malfunctions are those which persist for at least 30 minutes with the engine running). If the malfunction does not occur again it is registered as a sporadic malfunction and the letters "/SP" will appear at the right of the display. When the ignition is switched on, all existing malfunctions are automatically re-classified as sporadic malfunctions and will only register as static malfunctions if they still occur after testing. Sporadic malfunctions which no longer occur after 50 driving cycles (ignition on for at least 5 minutes, road speed of more than 30 km/h) are erased automatically.

Output Diagnostic Test Mode (DTM) (function 03)

Note. Output DTM may only be performed with the vehicle stationary and the engine not running. If any malfunctions are identified by the output DTM, trace the cause of the malfunction and if necessary replace the instrument cluster.

With output DTM, all "control elements" in the instrument cluster (if installed and coded) are activated in sequence.

1. Simultaneous activation of all analog instruments (coolant temperature gauge, tachometer, speedometer, fuel gauge)
2. Activation of auto-check system indicator symbols
3. Activation of seat belt warning lamp
4. Activation of gong (chime)

1. Segment test of multi-function display and/or LCD odometer
2. Test of instrument lighting in instrument cluster, including dimmer function

Note. The lights must be switched on for this test.

1. Overheating test: Activation of safety shut-off of air conditioner compressor

Output Diagnostic Test Mode (DTM), initiating

Indicated on display

1. Press buttons -0- and -3- to select "output DTM" function 03.

Indicated on display

1. Press -Q- button to confirm input This will start the output DTM for the analog instruments (displays).

Indicated on display

The following tests are carried out simultaneously when the -Q- button is pressed

1. Coolant temperature gauge needle moves across the full range of the scale
2. Tachometer needle moves across the full range of the scale
3. Speedometer needle moves across the full range of the scale
4. Fuel gauge needle moves across the full range of the scale

When the gauge needles have finished moving across the scales the following fixed vales will be displayed

Note. If the ignition is switched on and then off again while the gauge needles are moving, the needles will return to their starting positions.

1. Press --> button.

Indicated on display

Seat belt warning light will be activated.

Note. Depending on version / equipment, the seat belt warning light is activated via control module coding, i.e. if this actuator test is not performed, warning light is not active.

1. Press " button.

Indicated on display

The gong (chime) will be activated and will sound continuously.

1. Press --> button.

Indicated on display

Note. All the display points on the multi-function display, the LCD display for the odometer and the clock display will be activated. All the display segments on the Driver's Information Display will light up and one line will remain dark.

1. Press " button.

Indicated on display

The dimmer function for the instrument cluster lighting will be activated.

1. Press " button.

Indicated on display

1. Press --> button to terminate the output DTM.

This returns the tester to the basic function mode

Indicated on display

Diagnostic Trouble Code (DTC) Memory, erasing

Note. If it is not possible to erase the DTC memory, check the DTC memory once again and repair malfunctions.

Requirements

1. DTC memory checked. Refer to «Diagnostic Trouble Code (DTC) memory, checking (function 02)»(ref-276272-S04277666532008010300000)
2. All malfunctions repaired

After DTC memory has been successfully checked

Indicated on display

1. Press buttons -0- and -5- to select "Erase DTC Memory" function 05.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

The DTC memory is now erased.

1. Press --> button.

Indicated on display

Note. This message indicates an error in the test sequence: This message indicates an error in the test sequence: Adhere exactly to test sequence: First check DTC memory, if necessary repair malfunctions, then erase.

End Output (function 06)

Indicated on display

1. Press buttons -0- and -6- to select "End Output" function 06.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Switch off ignition.
2. Disconnect VAG 1551 scan tool.

Code Control Module (function 07)

This function can be used to code the instrument cluster for the following features

1. Optional equipment
2. Export version
3. Number of cylinders
4. Engine type

Note. The coding procedure is used to set the appropriate configuration for the on-board computer and check the system according to the equipment installed, the export version, the number of cylinders and the engine type. The coding table only gives the coding combinations that are possible for the Audi TT.

Coding procedure

Indicated on display

1. Press buttons -0- and -7- to select "Code Control Module" function 07.
2. Press -Q- button to confirm input

Indicated on display

Note. Coding is entered for various combinations of optional equipment, according to equipment level. If the vehicle is equipped with more than one item of optional equipment which needs to be coded, enter the sum total of the respective coding numbers.

1. Enter code number according to coding table. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__code-control-module-function-07) . Example: 06244

Coding table

Indicated on display (example only)

1. Press -Q- button to confirm input

After about 5 seconds this display will appear

1. Press " button.

Indicated on display

1. Press buttons -0- and -6- to select "End Output" function 06.

Read Measuring Value Block (function 08)

Use this function to observe various instrument cluster inputs and stored data.

The measuring value block is divided into 4 display groups, each containing 4 display fields.

Indicated on display

1. Press buttons -0- and -8- to select "Read Measuring Value Block"function 08.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter desired Display Group number from table. Refer to «Read Measuring Value Block (function 08)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__read-measuring-value-block-function-08)
2. Press -Q- button to confirm input.

The Read Measuring Value block selected will appear in standard format.

Interpreting displayed information. Refer to Read Measuring Value Block (function 08)

Note. The display on the scan tool will always show the actual values obtained from the senders and sensors. The values which appear on the instrument cluster are filtered and may not be the same. If the actual coolant temperature is between about 80 ° C and 100 ° C, the instrument cluster will always show 90 ° C. The display groups shown here are the only ones which can be called up for the instrument cluster.

Display groups, summary

Read Measuring Value Blocks, interpreting

Adaptation (function 10)

The adaptation function is used to carry out and store the following adjustments

1. Adapting fuel consumption display
2. Coding language version for Auto Check system
3. Resetting service interval display (SID)
4. Adapting odometer reading when instrument cluster is replaced

1. Adapting fuel gauge sender resistance range

The individual functions are selected by entering the appropriate adaptation channel number from adaptation table. Refer to Adaptation (function 10) .

Adaptation, initiating

Indicated on display

1. Press buttons -1- and -0- to select "Adaptation" function 10.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter desired channel number from adaptation table. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) .
2. Press -Q- button to confirm input

Note. After adapting one of the displays or exiting a particular channel, the adaptation function (function 10) must be selected again before the next adaptation channel can be entered.

Adaptation table

Service Interval Display (SID), resetting after service

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -2- to access "channel 02"
2. Press -Q- button to confirm input

Note. The service interval display serves to remind the driver that the vehicle is due for servicing. Messages appear in the Driver's Information Display. The service reminder will first appear 2000 km (1200 mi) before the next service is due. The display message comes up for 5 seconds every time terminal 15 is activated, and changes in steps of 100 km (62 mi.). Example of service interval display message: "SERVICE IN 1300 KM" will appear after the vehicle has been driven 13,700 km.

Note. When the service actually becomes due the message "SERVICE" will appear in the central display window for 5 seconds each time the ignition is switched on. A service is required after an elapsed period of 12 months, even if the distance covered in this time is less than 15,000 km (10,000 mi.). Servicing will always be required every 15000 km (10,000 mi.) in other words the Oil Change and the Inspection Service will be performed together at the end of the 15,000 km (10,000 mi.) interval. The service interval display can also be reset without using VAG 1551 scan tool/1552. Refer to Service interval display, resetting after a service without using VAG 1551/1552 . Software version of instrument cluster. Refer to Instrument cluster On Board Diagnostic (OBD), initiating .

Indicated on display:: the display will indicate the service interval function

1 - = set service interval: instrument cluster display will then show

"SERVICE"

Note. The service interval display can only be reset via direct input.

1. Press " button.

Indicated on display

The service interval is reset (adapted) by entering the following values

1. Enter the appropriate adaptation value (00000) via the button pad to reset the service interval.
2. Press button -0- five times.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

0 - means service is reset

i.e. "SERVICE IN 15000 km" will be indicated in the instrument cluster after confirming input using the Q-button.

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate resetting of service interval display.

Fuel consumption display, adapting

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -3- to access "channel 03".
2. Press -Q- button to confirm input

Note. Adaptation is only possible on vehicles with on-board computer. The value entered must be between 85% and 115%. The value must be entered in steps of 5%. If the value "100" was changed due to a customer complaint, the changed value must be entered into a new instrument cluster.

Indicated on display

1. Press --> button.

Note. The fuel consumption display can only be adapted via direct input.

Indicated on display

1. Enter required adaptation value via button pad on scan tool, filling in the initial spaces with "0."

Example

1. Required value: 90%
2. Entry via button pad: 00090

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of fuel consumption display.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Note. If an incorrect entry is made the testing unit will switch to function mode.

Indicated on display

1. Press " button.
2. Select adaptation function (function 10) and adaptation channel 03 again.
3. Repeat adaptation of fuel consumption display and confirm entry with -Q- button.

Language versions for multi-function display, adapting

Note. Adaptation is only possible on vehicles with on-board computer.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -4- to access "channel 04".
2. Press -Q- button to confirm input

Indicated on display

Note. The display will show only the last digit of the 5-figure language version code (e.g. 1 for German). If an incorrect value is entered the adaptation function will be terminated and must be re-started by selecting function 10 (Adaptation) again. The code can now be entered either directly or in stages via the button pad on the scan tool.

Coding table

Entering code in stages

1. Key 1 can be used to change down to a lower code value, and button 3 can be used to change up to a higher code value (for example, to change to "2" for English).

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of language version.

Direct input

Indicated on display

1. Press " button.

Indicated on display

1. Enter the required 5-figure code (Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) ) via button pad.

Example

1. Code: 2 (English)
2. Input: 00002

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of language version.

Odometer, adaptation

This function is used to set the correct odometer reading after replacing the instrument cluster.

Preparation

Note. The adaptation function can only be performed on instrument clusters with a maximum of 100 kilometers or 63 miles indicated on counter. The adaptation procedure can only be performed once on any one instrument cluster. The adaptation value entered must be higher than the existing value (over 100 kilometers or 63 miles). If an incorrect value is entered and confirmed, it cannot be changed. In this case the instrument cluster must be replaced.

1. Record instrument cluster input values and proceed with initial adaptations (code instrument cluster, etc.). Refer to «Replacement instrument cluster input values, adapting»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__replacement-instrument-cluster-input-values-adapting)

Adaptation

Indicated on display

1. Press buttons -1- and -1- to select "Login procedure" function 11.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter code number 13861.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press buttons -1- and -0- to select "Adaptation" function 10.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press buttons -0- and -9- to access "channel 09".
2. Press -Q- button to confirm input

Indicated on display

Note. The number can only be entered directly via VAG 1551 scan tool button pad.

1. Press --> button to advance the program sequence.

Indicated on display

1. Enter adaptation value (odometer reading) via scan tool button pad.

Example: 89627

0 8 9 6 3

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> to terminate adaptation of odometer.

SID: distance remaining until next Inspection Service (after replacing instrument cluster)

This function is used after replacing the instrument cluster to enter the distance remaining before the next Inspection Service is due.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -4- and -0- to access "channel 40".
2. Press -Q- button to confirm input

Indicated on display: for new instrument cluster

The distance remaining before the next Inspection Service is due must be transferred from the old instrument cluster (e.g. 5000 km = adaptation value 50).

Note. The distance can only be entered in steps of 100 km (62 mi.). Accordingly, the readout on the display will also be in steps of 100 km (62 mi.). The entered value is counted upward from 0 to 15000. When replacing the instrument cluster, see notes. Refer to Replacement instrument cluster input values, adapting . The number can only be entered directly via the button pad on the scan tool. If an incorrect value is entered the adaptation function will be terminated and must be re-started.

1. Press --> button.

Indicated on display

1. Enter required value (noted from old unit) via button pad on scan tool, filling in the initial spaces with "0."

Example

Distance remaining: 5000 km

Input value: 00050

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of service interval display.

SID: time remaining until next Inspection Service (after replacing instrument cluster)

This function is used after replacing the instrument cluster to enter the time remaining (in days) before the next Inspection Service is due.

Indicated on display

1. Press buttons 1 and 0 and confirm input with Q button.

Indicated on display

1. Press buttons 4 and 1.
2. Press -Q- button to confirm input
3. Indicated on display: for new instrument cluster

The time (in days) remaining before the next Inspection Service is due must be transferred from the old instrument cluster (e.g. 110 days = adaptation value 110).

Note. The number can be entered in steps of 1 day; the readout on the display will also be in steps of 1 day. The entered value is counted upward from 0 to 365 days. When replacing the instrument cluster, see notes. Refer to Replacement instrument cluster input values, adapting . When using the button pad on the scan tool, the number must be entered directly. If an incorrect value is entered the adaptation function will be terminated and must be re-started.

1. Press " button.

Indicated on display

1. Enter required value (noted from old unit) via button pad on scan tool, filling in the initial spaces with "0."

Example

1. Remaining time: 110 days
2. Input value: 00110

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of service interval display.

Fuel level sender, adaptation

This function is used to adjust the resistance range of the fuel gauge sender signal to compensate for any discrepancies in the "empty" and "full" values.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -3- and -0-.
2. Press -Q- button to confirm input

Indicated on display (example only): the display will show the adaptation value, e.g. 128.

Note. The adaptation value displayed represents the standard resistance range for the fuel gauge sender as set by the factory. The adaptation value for the fuel gauge sender resistance range can be adjusted from the pre-set value by ± 8. For software levels up to and including D17, the average value is 0 and the range is -8 to 8. From software levels D18, the average value is 128 and the range is 120 to 136.

1. Press " button.

Indicated on display

1. Enter adaptation value (e.g. 132) via button pad on scan tool, filling in the initial spaces with "0."

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> to terminate adaptation of fuel gauge sender resistance range.

Replacement instrument cluster input values, adapting

It is important to note the following points when replacing the instrument cluster

Note. The instrument cluster must always be coded. Before replacing the existing instrument cluster, record odometer reading and values appearing in all service interval display adaptation channels. Recorded values must be adapted to new instrument cluster so it can count down to the next service due. The immobilizer control module is integrated in the instrument cluster. Immobilizer function adaptation is also necessary after replacing instrument cluster.

The following steps must be carried out after replacing the instrument cluster

1. Code instrument cluster. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__code-control-module-function-07) .
2. Service Interval Display (SID): entering distance remaining until next Inspection Service. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) .
3. SID: entering time remaining until next Inspection Service. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) .
4. Adapt odometer reading. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) .

1. Adapt Immobilizer function. Refer to «Adaptation after replacing instrument cluster»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-after-replacing-instrument-cluster)
2. Adapt vehicle keys. Refer to «Adaptation of vehicle keys»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-of-vehicle-keys)

Service interval display, resetting after a service without using VAG 1551/1552

After a service has been carried out (Oil Change + Inspection Service), the service interval display must be reset accordingly.

The service interval display can be reset using the adaptation function on VAG 1551 scan tool. Refer to Adaptation (function 10) .

The service interval display can also be reset using the following procedure

1. Switch off ignition.
2. Press the trip recorder reset button on the instrument cluster and at the same time switch on the ignition.

When the trip recorder reset button is released, the display will show "SERVICE IN ???? km" or "SERVICE."

1. Within a period of 5 seconds, turn the clock adjuster knob on the instrument cluster counter-clockwise until the message is reset to "SERVICE IN 15000 KM."

The trip recorder display will now read "SERVICE IN 15000 KM."

1. Switch off ignition.

The following OBD program information applies to instrument clusters on vehicles through m.y. 2000 only. OBD program information for instrument clusters from m.y. 2001. Refer to General Information .

Always confirm vehicle VIN and instrument cluster software version as per section title above. Confirm instrument cluster software version by initiating OBD program and reading information in display. Refer to Instrument cluster On Board Diagnostic (OBD), initiating .

Information in this section also applies to replacement instrument clusters with software version D26 installed in vehicles through VIN 8N_Y040000.

Vehicles from start of production through VIN 8N_Y040000 contain instrument clusters with software versions through D24 that have limited Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information not specifically covered in this section.

Information on clusters on vehicles up to VIN 8N_Y040000 with software versions through D24 are contained in section "Instrument cluster On Board Diagnostic (OBD) through VIN 8N_Y040000 and software versions D24". Refer to Application notes .

The instrument cluster contains an electronic speedometer, tachometer, liquid crystal (LCD) displays for odometer, trip odometer, digital clock with date, as well as analog coolant temperature and fuel level gauges. Control and warning lamps are situated within the speedometer and tachometer faces.

A "Driver's Information System" LCD is located between the tachometer and speedometer. Displayed information includes an auto check system, outside air temperature, radio frequency and selectable trip computer functions.

The auto check system integrated with the Driver's Information System monitors the brake system, coolant temperature, fuel level, engine oil pressure, and displays the ambient temperature as a default.

The optional Navigation system display is also included in the Driver's Information System (where applicable).

The instrument cluster is controlled by a microprocessor and has extensive On Board Diagnostic (OBD) capability. If malfunctions occur in any of the system components, corresponding DTCs are stored in the Diagnostic Trouble Code (DTC) memory of the instrument cluster. These can then be identified using VAG 1551 Scan Tool (ST), VAG 1552.Mobile Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System.

Instrument clusters installed from VIN 8N_Y040001 have expanded Diagnostic Trouble Code (DTC), Read Measuring Value Block and Adaptation information over previous models.

For example: Service Interval Display (SID) adaptation values for USA/CDN models with fixed service intervals

Fixed service interval values, SID adaptation values

Note. The descriptions and displays in this section refer only to VAG 1551.

The following adaptation (adjustment) functions are also possible

1. Adapting fuel gauge sender resistance range
2. Adapting fuel consumption display
3. Coding of language versions for on-board computer and Auto Check system
4. Resetting service interval display

1. Setting distance/kilometer counter after replacing instrument cluster

Message "dEF" on trip recorder display

If the control module in the instrument cluster detects a malfunction in its permanent memory, the letters "dEF" will appear on the trip recorder display.

1. If "dEF" appears on the display, replace the instrument cluster. Refer to «Instrument cluster, removing and installing»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Notes on replacing instrument cluster

1. The instrument cluster must not be disassembled.
2. If necessary, the instrument cluster can be replaced with an exchange unit.
3. Complete the damage report form and return it together with the malfunctioning instrument cluster.
4. Malfunctioning units must always be returned in their original packing.

1. Various input values must be adapted to replacement speedometer. Refer to «Replacement instrument cluster input values, adapting»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Additional information

1. Wiring Diagrams
2. Technical Bulletins

Scan Tool (ST) and test equipment safety precautions

Test requirements

1. Check fuses using wiring diagram
2. Always check coding of instrument cluster according to coding table. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. Connect VAG 1551/1552 Scan Tool, VAS 5051 Vehicle Diagnostic, Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
4. Ignition switched on

Note. If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram. Additional operating instructions can be called up with the scan tool HELP button. The --> button serves to advance the program sequence. If an incorrect entry is made, press button C to escape. In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

1. Switch on printer with the Print button (indicator lamp lights up).
2. Press button -1- for "Rapid data transfer" mode.

Indicated on display

Address word for instrument cluster: 17

1. Press buttons -1- and -7- to select "Instrument Cluster" address word 17.

Indicated on display

1. Press -Q- button to confirm input

After about 5 seconds, the following appears on the display (example only)

1. 8N1920880: Part no. of instrument cluster
2. INSTR+IMMOB.: Instrument cluster plus anti-theft immobilizer component designation
3. M73: Manufacturer code for Magneti Marelli
4. D03: Software version of instrument cluster

1. Coding 06244: Coding of instrument cluster
2. WSC XXXXX: Workshop code

Note. Check coding according to coding table. Refer to Code Control Module (function 07) .

1. Press --> button.

Indicated on display: (example only)

1. AUZ5Z0W1000071: 14-digit ident. no. for immobilizer control module

1. Press --> button.

If the display shows one of the messages reproduced here, run through the troubleshooting procedure as described in the wiring diagram.

Refer to Wiring Diagrams, Troubleshooting & Component Locations binder

Indicated on display

1. After the HELP button is pressed, a list of the possible functions is printed out.
2. Press --> button to advance the program sequence.

Note. The following OBD program information applies to instrument clusters on vehicles through m.y. 2000 only. OBD program information for instrument clusters from m.y. 2001. Refer to General Information .

On Board Diagnostic (OBD) functions

The following functions are possible

02 - Check DTC Memory. Refer to Diagnostic Trouble Code (DTC) Memory, checking (function 02) .

03 - Output DTM. Refer to Output Diagnostic Test Mode (DTM) (function 03) .

05 - Erase DTC Memory. Refer to Diagnostic Trouble Code (DTC) Memory, erasing .

06 - End Output. Refer to End Output (function 06) .

07 - Code Control Module. Refer to Code Control Module (function 07) .

08 - Read Measuring Value Block. Refer to Read Measuring Value Block (function 08) .

10 - Adaptation. Refer to Adaptation (function 10) .

11 - Log-in Procedure. Refer to Adaptation (function 10) .

Note. The displayed diagnostic information is not constantly up-dated, but only when starting the On Board Diagnostic (OBD) or with the function 05 "Erase DTC Memory."

1. Switch on printer with the Print button (indicator lamp in button lights up).

Indicated on display

1. Press buttons -0- and -2- to select "Check DTC Memory" function 02.

Indicated on display

1. Press -Q- button to confirm input

The number of stored DTCs appears in the display.

The stored DTCs are displayed and printed out one after the other.

1. Check printout against DTC table and repair all malfunctions as necessary. Refer to «Diagnostic Trouble Code (DTC) table»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

If "No DTC recognized" is displayed the program will return to the start point after pressing --> button.

Indicated on display

If something else is displayed

Refer to Scan tool operating instructions

1. End Output (function 06). Refer to «End Output (function 06)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Switch off ignition and disconnect data link connector.

Note. The following table lists all the malfunctions that can be recognized by the instrument cluster and printed out by the VAG 1551. The DTCs are listed in order according to their 5-figure code numbers. DTCs appear only on print-out. Before replacing a component shown as malfunctioning, check wiring and connections to the component as well as Ground connections according to the wiring diagram. After completing a repair and checking the function of the system, always check the Diagnostic Trouble Code (DTC) memory once again with the VAG 1551 scan tool and erase the memory. The Diagnostic Trouble Code (DTC) memory records all static and sporadic malfunctions. If a malfunction occurs and persists for at least 2 seconds, it is identified as a static malfunction. (In the case of the ambient temperature display, a malfunction must persist for at least 60 seconds before it is classified as a static malfunction; in the case of the coolant temperature sender, static malfunctions are those which persist for at least 30 minutes with the engine running). If the malfunction does not occur again it is registered as a sporadic malfunction and the letters "/SP" will appear at the right of the display. When the ignition is switched on, all existing malfunctions are automatically re-classified as sporadic malfunctions and will only register as static malfunctions if they still occur after testing. Sporadic malfunctions which no longer occur after 50 driving cycles (ignition on for at least 5 minutes, road speed of more than 30 km/h) are erased automatically.

1) Where applicable. Component function may not be coded for US/CDN market.

2) Where applicable.

Note. Output DTM may only be performed with the vehicle stationary and the engine not running. If any malfunctions are identified by the output DTM, trace the cause of the malfunction and if necessary replace the instrument cluster.

With output DTM, all "control elements" in the instrument cluster (if installed and coded) are activated in sequence.

1. Simultaneous activation of all analog instruments (coolant temperature gauge, tachometer, speedometer, fuel gauge)
2. Activation of auto-check system indicator symbols
3. Activation of seat belt warning lamp
4. Activation of gong (chime)

1. Segment test of multi-function display and/or LCD odometer
2. Test of instrument lighting in instrument cluster, including dimmer function

Note. The lights must be switched on for this test.

1. Overheating test: Activation of safety shut-off of air conditioner compressor

Output Diagnostic Test Mode (DTM), initiating

Indicated on display

1. Press buttons -0- and -3- to select "output DTM" function 03.

Indicated on display

1. Press -Q- button to confirm input This will start the output DTM for the analog instruments (displays).

Indicated on display

The following tests are carried out simultaneously when the -Q- button is pressed

1. Coolant temperature gauge needle moves across the full range of the scale
2. Tachometer needle moves across the full range of the scale
3. Speedometer needle moves across the full range of the scale
4. Fuel gauge needle moves across the full range of the scale

When the gauge needles have finished moving across the scales the following fixed vales will be displayed

Note. If the ignition is switched on and then off again while the gauge needles are moving, the needles will return to their starting positions.

1. Press --> button.

Indicated on display

Seat belt warning light will be activated.

Note. Depending on version / equipment, the seat belt warning light is activated via control module coding, i.e. if this actuator test is not performed, warning light is not active.

1. Press " button.

Indicated on display

The gong (chime) will be activated and will sound continuously.

1. Press --> button.

Indicated on display

Note. All the display points on the multi-function display, the LCD display for the odometer and the clock display will be activated. All the display segments on the Driver's Information Display will light up and one line will remain dark.

1. Press " button.

Indicated on display

The dimmer function for the instrument cluster lighting will be activated.

1. Press " button.

Indicated on display

1. Press --> button to terminate the output DTM.

This returns the tester to the basic function mode

Indicated on display

Note. If it is not possible to erase the DTC memory, check the DTC memory once again and repair malfunctions.

Requirements

1. DTC memory checked. Refer to «Diagnostic Trouble Code (DTC) Memory, checking (function 02)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
2. All malfunctions repaired

After DTC memory has been successfully checked

Indicated on display

1. Press buttons -0- and -5- to select "Erase DTC Memory" function 05.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

The DTC memory is now erased.

1. Press --> button.

Indicated on display

Note. This message indicates an error in the test sequence: This message indicates an error in the test sequence: Adhere exactly to test sequence: First check DTC memory, if necessary repair malfunctions, then erase.

Indicated on display

1. Press buttons -0- and -6- to select "End Output" function 06.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Switch off ignition.
2. Disconnect VAG 1551 scan tool.

This function can be used to code the instrument cluster for the following features

1. Optional equipment
2. Export version
3. Number of cylinders
4. Engine type

Note. The coding procedure is used to set the appropriate configuration for the on-board computer and check the system according to the equipment installed, the export version, the number of cylinders and the engine type. The coding table only gives the coding combinations that are possible for the Audi TT.

Coding procedure

Indicated on display

1. Press buttons -0- and -7- to select "Code Control Module" function 07.
2. Press -Q- button to confirm input

Indicated on display

1. Enter code number according to coding table. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) . Example: 06244

Note. Coding is entered for various combinations of optional equipment, according to equipment level. If the vehicle is equipped with more than one item of optional equipment which needs to be coded, enter the sum total of the respective coding numbers.

Coding table

Indicated on display (example only)

1. Press -Q- button to confirm input

After about 5 seconds this display will appear

1. Press " button.

Indicated on display

1. Press buttons -0- and -6- to select "End Output" function 06.

Use this function to observe various instrument cluster inputs and stored data.

The measuring value block is divided into 12 display groups, each containing 4 display fields.

Indicated on display

1. Press buttons -0- and -8- to select "Read Measuring Value Block"function 08.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter desired Display Group number. Refer to table beginning from «Read Measuring Value Block (function 08)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Press -Q- button to confirm input.

The Read Measuring Value Block selected appears in the standard format.

Interpreting displayed information. Refer to from Read Measuring Value Block (function 08) .

Note. The display on the scan tool will always show the actual values obtained from the senders and sensors. The values which appear on the instrument cluster are filtered and may not be the same. If the actual coolant temperature is between about 80 ° C and 100 ° C, the instrument cluster will always show 90 ° C. Data from display groups 10 to 15 must be recorded prior to instrument cluster replacement. Read Measuring Value Block 140 indicates all Control Modules that are active on part of the Information CAN-Bus network. The display groups shown here are the only ones which can be called up for the instrument cluster.

Display groups, summary

1) Default value set by Factory is 128. If value has been changed due to customer complaint of inaccurate fuel level readings, the changed value must also be applied to the replacement instrument cluster.

2) Default value set by Factory is 100. If value has been changed due to customer complaint of inaccurate fuel consumption indicator readings, the changed value must also be applied to the replacement instrument cluster.

3) Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance

4) Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance

4) Where applicable. Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance. Where applicable, oil grade must be adapted after service.

The adaptation function is used to carry out and store the following adjustments

1. Adapting fuel consumption display
2. Coding language version for Auto Check system
3. Resetting service interval display (SID)
4. Adapting odometer reading when instrument cluster is replaced

1. Adapting fuel gauge sender resistance range

The individual functions are selected by entering the appropriate adaptation channel number from adaptation table. Refer to Adaptation (function 10) .

Indicated on display

1. Press buttons -1- and -0- to select "Adaptation" function 10.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter desired channel number from adaptation table. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Press -Q- button to confirm input

Note. After adapting one of the displays or exiting a particular channel, the adaptation function (function 10) must be selected again before the next adaptation channel can be entered.

Adaptation table

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -2- to access "channel 02"
2. Press -Q- button to confirm input

Note. The service interval display serves to remind the driver that the vehicle is due for servicing. Messages appear in the Driver's Information Display. The service reminder will first appear 2000 km (1200 mi) before the next service is due. The display message comes up for 5 seconds every time terminal 15 is activated, and changes in steps of 100 km (62 mi.). Example of service interval display message: "SERVICE IN 1300 KM" will appear after the vehicle has been driven 13,700 km.

Note. When the service actually becomes due the message "SERVICE" will appear in the central display window for 5 seconds each time the ignition is switched on. A service is required after an elapsed period of 12 months, even if the distance covered in this time is less than 15,000 km (10,000 mi.). Servicing will always be required every 15000 km (10,000 mi.) in other words the Oil Change and the Inspection Service will be performed together at the end of the 15,000 km (10,000 mi.) interval. The service interval display can also be reset without using VAG 1551 scan tool/1552. Refer to Service interval display, resetting after a service without using VAG 1551/1552 . Software version of instrument cluster. Refer to Instrument cluster On Board Diagnostic (OBD), initiating .

Indicated on display:: the display will indicate the service interval function

1 - = set service interval: instrument cluster display will then show

"SERVICE"

Note. The service interval display can only be reset via direct input.

1. Press " button.

Indicated on display

The service interval is reset (adapted) by entering the following values

1. Enter the appropriate adaptation value (00000) via the button pad to reset the service interval.
2. Press button -0- five times.

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

0 - means service is reset

i.e. "SERVICE IN 15000 km" will be indicated in the instrument cluster after confirming input using the Q-button.

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate resetting of service interval display.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -3- to access "channel 03".
2. Press -Q- button to confirm input

Note. Adaptation is only possible on vehicles with on-board computer. The value entered must be between 85% and 115%. The value must be entered in steps of 5%. If the value "100" was changed due to a customer complaint, the changed value must be entered into a new instrument cluster.

Indicated on display

1. Press --> button.

Note. The fuel consumption display can only be adapted via direct input.

Indicated on display

1. Enter required adaptation value via button pad on scan tool, filling in the initial spaces with "0."

Example

1. Required value: 90%
2. Entry via button pad: 00090

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of fuel consumption display.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Note. If an incorrect entry is made the testing unit will switch to function mode.

Indicated on display

1. Press " button.
2. Select adaptation function (function 10) and adaptation channel 03 again.
3. Repeat adaptation of fuel consumption display and confirm entry with -Q- button.

Note. Adaptation is only possible on vehicles with on-board computer.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -0- and -4- to access "channel 04".
2. Press -Q- button to confirm input

Indicated on display

Note. The display will show only the last digit of the 5-figure language version code (e.g. 1 for German). If an incorrect value is entered the adaptation function will be terminated and must be re-started by selecting function 10 (Adaptation) again. The code can now be entered either directly or in stages via the button pad on the scan tool.

Coding table

Entering code in stages

1. Key 1 can be used to change down to a lower code value, and button 3 can be used to change up to a higher code value (for example, to change to "2" for English).

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of language version.

Direct input

Indicated on display

1. Press " button.

Indicated on display

1. Enter the required 5-figure code (Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-function-10) ) via button pad.

Example

1. Code: 2 (English)
2. Input: 00002

1. Press -Q- button to confirm input

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of language version.

This function is used to set the correct odometer reading after replacing the instrument cluster.

Preparation

Note. The adaptation function can only be performed on instrument clusters with a maximum of 100 kilometers or 63 miles indicated on counter. The adaptation procedure can only be performed once on any one instrument cluster. The adaptation value entered must be higher than the existing value (over 100 kilometers or 63 miles). If an incorrect value is entered and confirmed, it cannot be changed. In this case the instrument cluster must be replaced.

1. Record instrument cluster input values and proceed with initial adaptations (code instrument cluster, etc.). Refer to «Replacement instrument cluster input values, adapting»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)

Indicated on display

1. Press buttons -1- and -1- to select "Login procedure" function 11.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Enter code number 13861.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press buttons -1- and -0- to select "Adaptation" function 10.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press buttons -0- and -9- to access "channel 09".
2. Press -Q- button to confirm input

Indicated on display

Note. The number can only be entered directly via VAG 1551 scan tool button pad.

1. Press --> button to advance the program sequence.

Indicated on display

1. Enter adaptation value (odometer reading) via button pad.

Example: 89627

0 8 9 6 3

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> to terminate adaptation of odometer.

This function is used to adjust the resistance range of the fuel level sender signal to compensate for any discrepancies in the "empty" and "full" values.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -3- and -0- to access "channel 30"
2. Press -Q- button to confirm input

Indicated on display (example only): the display will show the adaptation value, e.g. 128.

Note. The adaptation value displayed represents the standard resistance range for the fuel gauge sender as set by the factory (default value = 128). The adaptation value for the fuel gauge sender resistance range can be adjusted from the pre-set value by ± 8 (range = 120... 136). If default value value "128" has been changed due to customer complaint of inaccurate fuel level readings, the changed value must also be applied to the replacement instrument cluster.

1. Press " button.

Indicated on display

1. Enter adaptation value (e.g. 132) via button pad on scan tool, filling in the initial spaces with "0."

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> to terminate adaptation of fuel gauge sender resistance range.

Engine speed threshold, adaptation

This function permits influencing of the offset value for the engine speed threshold of the dynamic oil pressure warning function.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press buttons -3- and -5- to access "channel 35".
2. Press -Q- button to confirm input
3. Indicated on display: Display shows adaptation value, e.g. 0.

Note. Adaptation value 0 corresponds to a factory set oil pressure warning if oil pressure drops below 1.2 bar at an engine speed of 1500 rpm. Adaptation can be performed in four increments (0-1000). Adaptation value "250" changes engine speed threshold to 1750 rpm. If value "0" has been altered on account of a customer complaint modified value must be entered in new instrument cluster.

1. Press --> button.
2. Indicated on display
3. Enter required adaptation value (e.g. 00250) via scan tool button pad, filling in the initial spaces with "0", e.g. 00250.
4. Indicated on display (example only)

1. Press -Q- button to confirm input
2. Indicated on display
3. Press-Q- button to confirm input.
4. Indicated on display

1. Press-Q- button to confirm input.
2. Indicated on display
3. Press --> button to terminate adaptation of engine speed threshold.

SID: Distance remaining until next Inspection Service (adaptation after replacing instrument cluster)

This function is used after replacing the instrument cluster to enter the distance remaining before the next Inspection Service is due.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -4- and -0- to access "channel 40".
2. Press -Q- button to confirm input

Indicated on display: for new instrument cluster

The distance remaining before the next Inspection Service is due must be transferred from the old instrument cluster (e.g. 5000 km = adaptation value 50).

Note. The distance can only be entered in steps of 100 km (62 mi.). Accordingly, the readout on the display will also be in steps of 100 km (62 mi.). The entered value is counted upward from 0 to 15000. Input values when replacing instrument cluster. Refer to Replacement instrument cluster input values, adapting . The number can only be entered directly via the button pad on the scan tool. If an incorrect value is entered the adaptation function will be terminated and must be re-started.

1. Press --> button.

Indicated on display

1. Enter required value (noted from old unit) via button pad on scan tool, filling in the initial spaces with "0."

Example

Distance remaining: 5000 km

Input value: 00050

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of service interval display.

SID: time remaining until next Inspection Service (adaptation after replacing instrument cluster)

This function is used after replacing the instrument cluster to enter the time remaining (in days) before the next Inspection Service is due.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press buttons -4- and -1- to access "channel 41".
2. Press -Q- button to confirm input
3. Indicated on display: for new instrument cluster

The time (in days) remaining before the next Inspection Service is due must be transferred from the old instrument cluster (e.g. 110 days = adaptation value 110).

Note. The number can be entered in steps of 1 day; the readout on the display will also be in steps of 1 day. The entered value is counted upward from 0 to 365 days. Input values when replacing instrument cluster. Refer to Replacement instrument cluster input values, adapting . When using the button pad on the scan tool, the number must be entered directly. If an incorrect value is entered the adaptation function will be terminated and must be re-started.

1. Press " button.

Indicated on display

1. Enter required value (noted from old unit) via button pad on scan tool, filling in the initial spaces with "0."

Example

1. Remaining time: 110 days
2. Input value: 00110

Indicated on display (example only)

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. Press --> button to terminate adaptation of service interval display.

SID: Minimum distance, adaptation

This function stipulates a minimum distance for the SID.

Indicated on display

1. Press buttons -1- and -0- and confirm input with -Q- button.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press buttons -4- and -2- to access "channel 42".
2. Press-Q- button to confirm input.

Indicated on display: Display shows minimum distance until next service (here, e.g. 15 = 15000 km).

Note. Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance. Distance must be entered in steps of 1000 km. Accordingly, readout on the display will also be in steps of 1000 km. When using the button pad on the scan tool, the number must be entered directly. If an incorrect value is entered adaptation function will be terminated and must be restarted.

1. Press --> button.

Indicated on display

1. Enter required value via scan tool button pad, filling in initial spaces with "0".

Specification: 15000 km

Entry via keypad: 00015

Indicated on display (example only)

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation of minimum distance.

SID: Maximum distance, adaptation

This function stipulates a minimum distance for the SID.

Indicated on display

1. Press buttons 1 and 0 and confirm input with Q button.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press buttons 4 and 3.
2. Press-Q- button to confirm input.

Indicated on display: Display shows maximum distance until the next service (here, e.g. 30 = 30,000 km).

Note. The value entered for the corresponding engine variation must correspond to value of table. Refer to General information . Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance. The distance must be entered in steps of 1000 km. Accordingly, readout on the display will also be in steps of 1000 km. When using the button pad on the scan tool, the number must be entered directly. If an incorrect value is entered adaptation function will be terminated and must be restarted.

1. Press --> button.

Indicated on display

1. Enter required value via scan tool button pad, filling in initial spaces with "0".

Input value: e.g. 30000 km

Entry via keypad: 00030

Indicated on display (example only)

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation of maximum distance.

SID: Maximum time interval, adaptation

This function stipulates a max. time interval in days for the SID.

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press buttons -4- and -4- to access "channel 44".
2. Press-Q- button to confirm input.
3. Indicated on display: Display shows maximum time interval in days until the next service (here, e.g. 730 = 730 days).

Note. The value entered for the corresponding engine variation must correspond to value of table. Refer to General information . Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance. The respective specified value can only be entered in steps of single days and the display is therefore also in days. When using the button pad on the scan tool, the number must be entered directly. If an incorrect value is entered adaptation function will be terminated and must be restarted.

1. Press --> button.
2. Indicated on display
3. Required value via scan tool button pad, filling in the initial spaces with "0".

Input value: e.g. 730 days

Entry via keypad: 00730

1. Indicated on display
2. Press-Q- button to confirm input.
3. Indicated on display
4. Press-Q- button to confirm input.

1. Indicated on display
2. Press-Q- button to confirm input.
3. Indicated on display
4. Press --> button to terminate adaptation of maximum time interval.

Oil grade, adaptation (where applicable)

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press buttons -4- and -5- to access "channel 45".
2. Press-Q- button to confirm input.

Note. Oil used must be re-adapted after each service. The adaptation value can be set from 1-4. Attached to each value from 1-4 is a max distance (channel 43) and a maximum time (channel 44). The value entered for the corresponding engine variation must correspond to value of table. Refer to General information . Confirm maintenance intervals applicable to vehicle. Refer to Service Circulars, Maintenance.

Indicated on display

1. Press --> button.

Indicated on display

1. Required value via scan tool button pad, filling in the initial spaces with "0".

Input value: e.g. 2

Entry via keypad: 00002

Indicated on display (example only)

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation of oil grade.

Total consumption, adaptation

Indicated on display

1. Press buttons -1- and -0- and confirm input with Q button.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press buttons -4- and -6- to access "channel 46".
2. Press-Q- button to confirm input.

Note. Displayed value must be adopted on instrument cluster replacement. The value indicated does not correspond to the actual consumption but rather to a calculated, averaged value for the service interval indicator based on various distance and engine data.

Indicated on display

1. Press --> button.

Indicated on display

1. Enter displayed adaptation value via scan tool button pad, filling in initial spaces with "0".

Required value: 300 l

Entry via keypad: 00300

Indicated on display (example only)

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press-Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation of total consumption.

Powertrain CAN-Bus, adaptation

Note. The instrument cluster does not support Powertrain CAN-Bus functions. Therefore, "0" must be confirmed as the adaptation value. Input values when replacing instrument cluster. Refer to Replacement instrument cluster input values, adapting .

Indicated on display

1. Press keys -1- and -0- and confirm input with Q button.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press keys -6- and -0- to access "channel 60".
2. Press -Q- button to confirm input.

Indicated on display

1. Press --> button.

Indicated on display

Entry via keypad: 00000

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation for Powertrain CAN-Bus.

Information CAN-Bus, adaptation

Note. The adaptation values of the table. Refer to Adaptation (function 10) are input. Input values when replacing instrument cluster. Refer to Replacement instrument cluster input values, adapting .

Indicated on display

1. Press -1- and -0- and confirm by pressing the -Q- button.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press buttons -6- and -2- to access "channel 62".
2. Press -Q- button to confirm input.

Indicated on display

1. Press --> button.

Indicated on display

1. Using table. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) , input desired value using scan tool button pad, filling initial positions with "0".

Example input value: 5 (Navigation and Symphony radio)

Keypad input: 00005

Indicated on display (example only)

1. Press -Q- button to confirm input.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display

1. Press --> button to terminate adaptation for Information CAN-Bus.

Table

Control modules which communicate over the Information CAN-Bus network have individual adaptation values. These values must be added together.

Example: Vehicle with Radio (Symphony) and Navigation System III (NS low)

1. Adaptation value: Symphony Radio + Nav. = 1 + 4 = 5

It is important to note the following points when replacing the instrument cluster

Note. The instrument cluster must always be coded.. Before replacing the existing instrument cluster, record odometer reading and all values appearing in Read Measuring Value Blocks 10 to 15. Recorded values must be transferred/programmed into the new instrument cluster so it can count down to the next service due. The immobilizer control module is integrated in the instrument cluster. Immobilizer function adaptation is also necessary after replacing instrument cluster.

The following steps must be carried out after replacing the instrument cluster

1. Code instrument cluster. Refer to «Code Control Module (function 07)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Adapt fuel consumption display (only when default value in original instrument cluster was changed). Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. Adapt language version for multi-function display. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
4. Adapt fuel level sender (only when default value in original instrument cluster was changed). Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)

1. Service Interval Display (SID): Enter distance remaining until next Inspection Service. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
2. SID: Enter time remaining until next Inspection Service. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. SID: Adapt maximum distance. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
4. SID: Adaption maximum time. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)

1. Adapt oil grade (where applicable). Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
2. Adapt total consumption quantity. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
3. Adapt Powertrain CAN-Bus. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
4. Adapt Information CAN-Bus. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)

1. Adapt odometer reading. Refer to «Adaptation (function 10)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
2. Adapt Immobilizer function. Refer to «Adaptation after replacing instrument cluster»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-after-replacing-instrument-cluster)
3. Adapt vehicle keys. Refer to «Adaptation of vehicle keys»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-of-vehicle-keys)

After a service has been carried out (Oil Change + Inspection Service), the service interval display must be reset accordingly.

The service interval display can be reset using the adaptation function on VAG 1551 scan tool. Refer to Adaptation (function 10) .

The service interval display can also be reset using the following procedure

1. Switch off ignition.
2. Press the trip recorder reset button on the instrument cluster and at the same time switch on the ignition.

When the trip recorder reset button is released, the display will show "SERVICE IN ???? km" or "SERVICE."

1. Within a period of 5 seconds, turn the clock adjuster knob on the instrument cluster counter-clockwise until the message is reset to "SERVICE IN 15000 KM."

The trip recorder display will now read "SERVICE IN 15000 KM."

1. Switch off ignition.

Data exchange between control modules, checking

Note. Data exchange between individual control modules occurs via a bus system. The term "CAN-bus" refers to a system that transports and distributes data. The wire connections between the control modules, via which data is transferred, are referred to as data wires. Data is transferred to the connected control modules serially (one after the other) via these data wires.

Bus system, checking

The DTC table indicated that data exchange via the bus should be checked

1. Check to be sure the multi-pin connectors of the control modules are securely connected.

Requirements

1. VAS 5051/5052 tester connected and vehicle On Board Diagnostic (OBD) selected. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Ignition switched on.

Procedure

Scheme 1

Display on VAS 5051/5052

1. In selection -1-, press "00 - Check DTC Memory - complete system".

Note. The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.

1. Wait until the next indication appears on display.

When a control module responds with its identification, the display indicates the number of stored errors or indicates "no malfunctions recognized".

1. If necessary, print out Screen content or On Board Diagnostic (OBD) protocol

Refer to Operating instructions for VAS 5051/5052 tester

If a malfunction involving "... databus" or "... no communication" is indicated

1. Check whether the correct control module for this vehicle is installed (part number and coding).

If the correct control modules are installed, check the CAN bus system.

Checking a "two-line bus system"

Three or more control modules are communicating across a "two-line bus system".

1. Analyze the DTCs stored in the memories of the control modules.

Note. This analysis will help you locate the cause of the line malfunction.

Scheme 2

Example 1

From the DTCs stored in the memories, you have determined that control module 1 is not communicating with control modules 2 and 3.

1. Switch ignition off.
2. Disconnect the control modules connected across the bus wires and check the bus wires for an open circuit.

Refer to Wiring Diagrams, Troubleshooting & Component Locations

1. Replace control module 1 if no malfunctions can be found in the bus wires.

Scheme 3

Example 2

From the DTCs stored in the memories, you have determined that control module 2 is not communicating with control modules 1 and 3.

1. Switch ignition off.
2. Disconnect the control modules connected across the bus wires and check the bus wires for an open circuit.

Refer to Wiring Diagrams, Troubleshooting & Component Locations

1. Replace control module 2 if no malfunctions can be found in the bus wires.

Example 3

Using the DTCs stored in the memories, you have determined that none of the control modules are sending or receiving signals.

1. Switch ignition off.

Scheme 4

1. Disconnect the control modules connected across the bus wires and check for short circuits between the bus wires.

Refer to Wiring Diagrams, Troubleshooting & Component Locations

Scheme 5

1. Check the bus wires for short circuit to B+ or Ground (GND).

If a cause for the malfunction can not be determined, e.g. "powertrain data-BUS malfunctioning", check whether one of the control modules may be responsible for the DTC.

All control modules that use the CAN-bus are still disconnected. Ignition is switched off.

1. Connect one of the control modules.
2. Connect VAS 5051/5052 tester. Switch ignition on, and erase the DTC memory of the control module you just connected. End scan tool output using the "End Output" function 06.
3. Switch ignition off and then on.
4. Leave ignition on for 10 seconds. Then, read the DTC memory of the control module just connected.

1. If the DTC "powertrain data-BUS malfunctioning" is displayed, replace the control module just connected.
2. If the DTC "powertrain data-BUS malfunctioning" is not displayed, connect the next control module and repeat the procedure.

TT models from 09.00 production are equipped with Immobilizer Generation III.

Generation III has the same functionality as the previous version. However, in addition to the normal data exchange between the immobilizer control module and ignition key, Gen. III includes data exchange between the immobilizer control module and Engine Control Module (ECM).

Data exchange between the Immobilizer control module and ECM takes place over the vehicle CAN-Bus network.

Note. For Immobilizer III, the Engine Control Module (ECM) is actively incorporated into the evaluation and monitoring. The control module for immobilizer is integrated into the instrument cluster.

Scheme 6

1. For immobilizer III, the keys are marked with an inscribed "W". The code consists of a fixed code and a variable code portion.

Function

Immobilizer III consists of

1. an adapted control module for anti-theft immobilizer (integrated in instrument cluster)
2. a warning light in instrument cluster
3. an induction coil at ignition lock
4. an adapted Engine Control Module (ECM)

1. and adapted ignition keys with electronics (transponder).

The control module for anti-theft immobilizer is integrated in the instrument cluster, e.g. if control module is malfunctioning, instrument cluster must be replaced. Refer to Instrument cluster, removing and installing .

The anti-theft immobilizer is a system for enabling/locking the Engine Control Module (ECM) via the CAN wire.

The transponder code consists of a fixed code and a variable code. This is different for every start procedure and therefore acts as a copy protection for the transponder.

Every immobilizer contains a different computational rule for the variable code that remains the same for its entire service life. During adaptation of the vehicle key, the immobilizer writes this computational rule into the transponder and simultaneously learns the fixed code of the current key.

The fixed code identifies each individual key so that a key that is lost can be blocked from usage. Each time the ignition is switched on, the induction coil for immobilizer reads the transponder's fixed code and then the variable code and determines whether this key is authorized for vehicle start.

The warning lamp lights up briefly (max. 3 seconds) and then goes out when an authorized vehicle key is used.

When an unauthorized vehicle key is used or when a system malfunction occurs, the warning lamp blinks constantly during ignition "on".

The electronic anti-theft immobilizer is capable of extensive On Board Diagnostic (OBD). If malfunctions occur in any of the system components, corresponding Diagnostic Trouble Codes (DTC) are stored in the DTC memory of the anti-theft immobilizer.

Note. All OBD program functions for anti-theft immobilizer must only be performed using VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System.

Notes for use and adaptation of vehicle key

Engine will only start when an authorized vehicle key is used, i.e. on of the keys adapted to the immobilizer.

During adaptation of the vehicle keys (Refer to Adaptation of vehicle keys ), all vehicle keys, including replacement and emergency keys, must always be adapted to the immobilizer.

If new or extra vehicle keys are required, adaptation of all vehicle keys must be performed.

If adaptation cannot be performed for all vehicle keys, e.g. key lost during a trip, the customer must be informed that adaptation must eventually be performed for any and all vehicle keys.

Especially when a key has been lost, all vehicle keys should be re-adapted, since this will render the lost key unauthorized for vehicle start.

Anti-theft immobilizer On Board Diagnostic (OBD), initiating

Additional information

1. Wiring Diagrams
2. Technical Bulletins

Scan Tool (ST) and test equipment safety precautions

Test requirements

1. Check fuses using wiring diagram. Refer to Wiring Diagrams
2. Connect VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. Ignition switched on

Note. If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram. Additional operating instructions can be called up with the scan tool HELP button. The --> button serves to advance the program sequence. If an incorrect entry is made, press button C to escape. In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

Procedure

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "17 - instrument cluster" (instrument panel insert).

Note. Because the immobilizer is integrated in the instrument cluster, the same address word must be used as for the instrument cluster.

1. Wait until the next indication appears on display.

Note. Confirm instrument cluster is coded according to market and equipment level. Refer to Code Control Module (function 07)

Scheme 7

Display on VAS 5051/5052

1 - Control module identification of instrument cluster

2 - Control module identification of immobilizer

1. Press delta - button

Scheme 8

Display on VAS 5051/5052

1 - Selection of diagnostic functions

Note. The displayed DTC information is updated only when initiating OBD or with "Erase DTC Memory" function 05.

1. Initiate On Board Diagnostic (OBD) of immobilizer. Refer to «Anti-theft immobilizer On Board Diagnostic (OBD), initiating»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__anti-theft-immobilizer-on-board-diagnostic-obd) .

Display on VAS 5051/5052

1. In selection -1-, click on the diagnostic function "02 - Check DTC Memory".

Scheme 9

Display on VAS 5051/5052

1 - DTC memory content

[small diamond] 0 malfunctions recognized

or

[small diamond] X malfunctions recognized

2 - Diagnostic Trouble Code (DTC)

[small diamond] DTC

[small diamond] malfunction location

[small diamond] malfunction type

If malfunctions were recognized

1. Print out Screen content or On Board Diagnostic (OBD) protocol

Refer to Operating instructions for the VAS 5051/5052 tester

1. Press <-- - button

Display on VAS 5051/5052

1. Repair malfunction(s) according to DTC table. Refer to «DTC table»(/audi/tt/8n-1998-2003/remont/door-locks-anti-theft-systems/#body-on-board-diagnostic-obd) .
2. In selection -1-, press diagnostic function "02 - Check DTC Memory" again and Erase DTC Memory. Refer to «Diagnostic Trouble Code (DTC) Memory, erasing (function 05)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__diagnostic-trouble-code-dtc-memory-erasing)
3. In selection, click on diagnostic function "06 - End Output". Refer to «End Output (function 06)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

If no malfunction was recognized

1. In selection -1-, click on diagnostic function "06 - End Output". Refer to «End Output (function 06)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Note. Next, all possible malfunctions that can be recognized by the immobilizer and printed out by the VAS 5051 tester are listed according to their 5-digit DTC. DTCs of the instrument cluster can also be indicated, since the immobilizer is integrated in the instrument cluster. DTC memory stores all static and sporadic malfunctions: If a malfunction occurs and persists for at least 2 seconds, it is identified as a static malfunction. If a malfunction does not occur again, it is registered as sporadic. In addition, "sporadic" is indicated on display. When the ignition is switched on, all existing malfunctions are automatically re-classified as sporadic malfunctions and will only register as static malfunctions if they still occur after testing. Sporadic malfunctions which no longer occur during 50 driving cycles (ignition on at least 5 minutes, vehicle speed greater than 30 km/h) are erased automatically. Do not immediately replace components that the VAS 5051 suggests are malfunctioning, instead: Check wire connections and harness connectors to these components according to wiring diagram. Also check Ground (GND) connections according to wiring diagram. This is particularly valid when malfunctions are displayed as "sporadic". When repairing an open circuit for a CAN-bus malfunction, always be sure to prevent electromagnetic interference by twisting both data wires of the respective BUS system together. After repair, DTC memory must be checked again and erased.

Diagnostic Trouble Code (DTC) Memory, erasing (function 05)

Note. If DTC memory cannot be erased, Check DTC Memory again and repair malfunction. DTCs are not updated after erasing DTC memory until after ignition has been switched on and off.

Requirements

1. DTC memory checked. Refer to «Check DTC memory»(/audi/tt/8n-1998-2003/remont/door-locks-anti-theft-systems/#body-on-board-diagnostic-obd) .
2. All malfunctions repaired.

Procedure

After successful DTC memory check

Display on VAS 5051/5052

1. In selection -1-, click on the diagnostic function "05 - Check DTC Memory".

Scheme 10

Display on VAS 5051/5052

1 - [small diamond] no indication (before erasing)

or

[small diamond] DTC memory erased

Note. If indication -1- appears in display field: "DTC memory has not yet been checked", the work sequence was not adhered to correctly. DTC memory can only be erased if DTC memory was checked before.

2 - function? is being erased !

1. Press on "OK"-button in display -2-.
2. End function "05 - Erase DTC Memory" by pressing on <-- -button.

Display on VAS 5051/5052

1. Select diagnostic function "06 - End Output" in selection -1-.

Display on VAS 5051/5052

1. Switch off ignition and disconnect diagnostic connector after this indication is displayed.

1. Initiate On Board Diagnostic (OBD) of immobilizer. Refer to «Anti-theft immobilizer On Board Diagnostic (OBD), initiating»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__anti-theft-immobilizer-on-board-diagnostic-obd) .

Display on VAS 5051/5052

1. Select diagnostic function "08 - read measured value block" in selection -1-.

Scheme 11

Display on VAS 5051/5052

1 - Enter display group Max. input value = 255

1. Enter desired display group number in button field -2-. Refer to table --> «Read Measuring Value Block (function 08)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Interpreting displayed information. Refer to Read Measuring Value Block (function 08) .

Scheme 12

Display on VAS 5051/5052

1 - Display group X

2 - Display field 1

Display field 2

Display field 3

Display field 4

Note. If no display follows, a display field is not assigned. To switch to a different display group, proceed as follows

1. Press "08 - Erase DTC Memory" to end function <-- -button.

Display group overview

1) Read function where applicable

1) Where applicable

1) Read function where applicable

1) Read function where applicable

1) Depending on the Engine Control Module (ECM), the measuring value block registers position "0 = Engine Control Module not responding" for 10 to 30 seconds after engine and ignition are switched off, i.e. ECM is switched clear and there is no malfunction. Initiate On Board Diagnostic (OBD) again to be sure. Refer to Anti-theft immobilizer On Board Diagnostic (OBD), initiating .

1) Read function where applicable.

2) This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.

1) Read function where applicable

Using the adaptation function, the following changes can be made and saved.

1. Perform adaptation of vehicle keys. Refer to «Adaptation of vehicle keys»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-of-vehicle-keys)
2. Adaptation after replacing Engine Control Module (ECM). Refer to «Adaptation after replacing Engine Control Module (ECM)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-after-replacing-engine-control-module) .
3. Adaptation after replacing instrument cluster. Refer to «Adaptation after replacing instrument cluster»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-after-replacing-instrument-cluster) .

Adaptation of vehicle keys

Note. If new or additional ignition keys are required, they must be adapted to the anti-theft immobilizer. All ignition keys, including those that were previously authorized, must be re-adapted. Especially when a key has been lost, all vehicle keys should be re-adapted, since this will render the lost key unauthorized for vehicle start. If it is not possible to adapt all keys for some reason, i.e. during a trip, the customer must have this done later at his/her local Audi dealership. The number of adapted keys is indicated after selecting the adaptation function (channel 21) and also in measuring value block 022. Adaptation can be interrupted using the "C" button. Once a key is adapted, it is locked and cannot be adapted to another immobilizer system.

Requirement

1. All keys available. If an old ignition key is not available, see "Lost key procedure". Refer to «Lost key procedure»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__lost-key-procedure) .

Procedure

1. Insert first key in ignition lock and switch on ignition.
2. Initiate On Board Diagnostic (OBD) of immobilizer. Refer to «Anti-theft immobilizer On Board Diagnostic (OBD), initiating»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__anti-theft-immobilizer-on-board-diagnostic-obd) .
3. Perform login procedure for instrument cluster. Refer to «Login Procedure (function 11)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__login-procedure-function-11) .

Note. Once the login procedure has been successfully completed, the warning lamp will light constantly and the immobilizer will be switched free for a specific time

Display on VAS 5051/5052

1. In selection -1-, select the diagnostic function "10 - Adaptation".

Display on VAS 5051/5052

1 - Enter channel number Max. input value = 99

1. Select function "21" in button field -2- for "Adaptation channel 21" and press Q button to confirm input.

Scheme 13

Display on VAS 5051/5052

1 - Channel 21 read and test

2 - old number of keys

5 - The sliding bar is positioned on the current adaptation value, e.g. 2 The number of ignition keys which are adapted to the system will be displayed (e.g. 2)

Note. If indication -1- appears in display field: "Function unknown or cannot be performed at the moment", repeat login-procedure and the adaptation.

1. Enter 5-digit adaptation value. Insert zeros in front.

Example

Desired input value: 4 keys (including the key which is inserted in the ignition switch; max. 8 are possible)

Keypad input: 00004

1. Press -Q- button to confirm input.

Scheme 14

Display on VAS 5051/5052

1 - Channel 21save

2 - old number of keys

4 - original value 2, new value 4

1. Confirm new adaptation value by pressing the "take over" button -3-.

Note. No single key must require more than 30 seconds during adaptation, otherwise the warning lamp will blink with a frequency of 2 Hz and adaptation must be performed again in its entirety (login procedure and adaptation).

Scheme 15

Display on VAS 5051/5052

1 - Channel 21 Value 4 stored

Warning lamp in instrument cluster goes out and key in ignition is now adapted.

1. End function "10 - Adaptation" by pressing <-- -button.

Display on VAS 5051/5052

1. Select diagnostic function "06 - End Output" in selection -1-.
2. Switch ignition off.
3. Insert next key in ignition lock and switch on ignition. Warning lamp lights up when ignition is switched on and goes out after approx. one second. This key is also adapted now.
4. Repeat procedure until all keys have been adapted. After the last key, the warning light will go out approx. 2 seconds after successful adaptation and a short confirmation signal will be given (0.5 seconds light off, 0.5 seconds light on, light off).

1. During adaptation of vehicle keys, the fixed code of each key (transponder) is adapted to the immobilizer. Furthermore, the computational rule for the variable code is written into each key and locked. After that, keys can only be adapted for immobilizer III if they have the correct computational rule for the variable code (key had already been adapted to the system) or if they have not yet been locked (replacement part key). Adapted vehicle keys can not be used in conjunction with a different immobilizer system.
2. Select "Check DTC Memory", function 02. If there are no DTCs stored, then the function "Adapting keys" has been completed successfully.

Adaptation of ignition keys is automatically terminated if

1. The number of keys to be adapted has been reached.
2. The ignition is switched on using a key that is already adapted and remains switched on for more than one second (DTC stored).
3. The allotted adaptation time of 30 seconds per key, after ignition is switched on, is exceeded (DTC stored).
4. A DTC is stored during key adaptation.

Lost key procedure

1. Produce or order a replacement ignition key according to the lock number.
2. Adapt all vehicle keys. Refer to «Adaptation of vehicle keys»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-of-vehicle-keys) .
3. For vehicles with remote controlled central locking, all remote keys must be adapted to the control module for central locking.

Refer to 01 ON BOARD DIAGNOSTIC (OBD) .

Determining the secret number (7-digit PIN)

The secret number is determined in conjunction with the 14 digit identification number of the Engine Control Module (ECM) or anti-theft immobilizer, and is read upon initiation of On Board Diagnostic (OBD).

Effective calendar date 03.11.2002, the immobilizer secret number is encoded for increased security. The encoded number is now 7-digits and is referred to as a "PIN" ("Personal Identification Number").

All models with anti-theft immobilizer are affected, regardless of generation.

The process to obtain the 7-digit PIN remains the same as with the 4-digit "secret number" previously used - that is: request via the "Warranty Information Network" (WIN). However, WIN Administration now requires additional information from both the vehicle and Dealer in order to generate the 7-digit PIN.

The PIN is only valid on the day it is requested. Thereafter, a new PIN is required.

The 7-digit PIN can only be processed and input using either the VAS 5051 or VAS 5052 with basis CD version 3.10 and higher. VAG 1551/1552 Scan Tools are unable to process or input this number.

A correct Importer/Dealer number must reside in the VAS 5051/5052 in order to request a PIN.

The requested PIN is intended for internal use only, is worthless to other Dealers and must not be shared with the customer.

Adaptation after replacing instrument cluster

Note. The instrument cluster (with integrated anti-theft immobilizer) is adapted to the Engine Control Module (ECM). If the instrument cluster is replaced, the new instrument cluster must be re-adapted to the Engine Control Module (ECM). After adapting the instrument cluster to the Engine Control Module (ECM), vehicle key adaptation must be performed. Refer to Adaptation of vehicle keys . If no authorized ignition key is available, but the 7-digit PIN is available, new ignition keys must be made and adapted to "Adaptation after replacing instrument cluster". Adaptation can be interrupted using the "C" button.

Requirements

1. VAS 5051/5052 tester connected and vehicle On Board Diagnostic (OBD) selected. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Ignition switched on.

Procedure

1. Insert old (authorized) ignition key into ignition lock and switch on ignition.

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "01 - Engine electronics".
2. Wait until the next indication appears on display.

Display on VAS 5051/5052

1 - Control module identification of Engine Control Module (ECM).

2 - Control module identification of immobilizer

Use the 14 digit identification number of the ECM to determine the 7-digit PIN. Refer to Lost key procedure .

1. Press delta - button

Display on VAS 5051/5052

1. Select diagnostic function "06 - End Output" in selection -1-.

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "17 - instrument cluster"
2. Wait until the next indication appears on display.

Display on VAS 5051/5052

1 - Control module identification of the instrument cluster

2 - Control module identification of immobilizer

Replacement part instrument clusters already have a 14 digit identification number (this is necessary if instrument cluster and Engine Control Module (ECM) are being replaced simultaneously). During adaptation of the instrument cluster to the ECM, this number is transferred to the ECM.

Note. If a used or remanufactured instrument cluster is being installed, it must first be switched free via a login procedure. Refer to Login Procedure (function 11) . The 7-digit PIN for this must be determined via the 14-digit identification number of the used instrument cluster. Continue as follows after successful login procedure

1. Press delta - button

Display on VAS 5051/5052

1. In selection -1-, select the diagnostic function "10 - Adaptation".

Display on VAS 5051/5052

1 - Enter channel number Max. input value = 99

1. Select function "50" in button field -2- for "Adaptation channel 50" and press Q button to confirm input.

Display on VAS 5051/5052

1 - Channel 50read and test

2 - PIN ?

3 - Keypad - only direct input via the keypad is possible

4 - Sliding bar is positioned on 32000

1. Press "Keypad" button -3-.

Display on VAS 5051/5052

1 - Enter adaptation value Input value: 0 to 65535

1. Enter previously determined 7-digit PIN (of Engine Control Module (ECM)) in button field -2-.
2. Press -Q- button to confirm input.

Note. If the 7-digit PIN is entered incorrectly three times, tester display will indicate "locked 10". This locking time can also be indicated in measuring value block 024 (display field 2). Adaptation is now locked for 10 minutes. This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.

1. Wait until the next indication appears on display.

Note. If a malfunction occurs during adaptation, the following DTCs can be displayed: "Interference": CAN-bus not available or engine speed recognized (adaptation only with the engine standing still)

Note. "Adaptation not OK": Engine Control Module (ECM) cannot give out data (17-digit VIN, 14-digit identification number), since the control module is still new (factory condition) or the data is faulty. "System not OK": Engine Control Module (ECM) does not give out data, since it was previously used with a control module (instrument cluster) in another performance class (tuning-protection) "Key not OK": Data cannot be given out or accepted, because no key or no matching key is available.

If no malfunction is present, this display appears

Display on VAS 5051/5052

1 - Channel 50read and test

2 - 17-digit VIN (Vehicle Identification Number)

5 - Sliding bar is positioned on 32000

In addition, the warning lamp in instrument cluster lights up.

1. Press "Save" button -4-.

Scheme 16

Display on VAS 5051/5052

1 - Channel 50 save

2 - 17-digit VIN (Vehicle Identification Number)

4 - original value 32000, new value 32000

1. Confirm new adaptation value by pressing the "take over" button -3-.

Display on VAS 5051/5052

1 - Channel 50 Value 32000 stored

The warning light will go out approx. 2 seconds after successful adaptation and a short confirmation signal will be given (0.5 seconds light off, 0.5 seconds light on, light off).

1. End function "10 - Adaptation" by pressing <-- -button.

Adaptation of the immobilizer to the Engine Control Module (ECM) has been completed.

1. Perform adaptation of vehicle keys. Refer to «Adaptation of vehicle keys»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__adaptation-of-vehicle-keys)

Adaptation after replacing Engine Control Module (ECM)

Note. The Engine Control Module (ECM) is adapted to the instrument cluster (with integrated anti-theft immobilizer). When the Engine Control Module (ECM) is replaced, the new ECM must be re-adapted to the immobilizer. If no authorized ignition key is available, but the 7-digit PIN is available, new ignition keys must be manufactured and adapted to the "Adaptation after replacing instrument cluster". Adaptation can be interrupted using the "C" button.

Procedure

1. Initiate On Board Diagnostic (OBD) of immobilizer. Refer to «Anti-theft immobilizer On Board Diagnostic (OBD), initiating»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__anti-theft-immobilizer-on-board-diagnostic-obd) .

Display on VAS 5051/5052

1 - Control module identification of the instrument cluster

2 - Control module identification of immobilizer

Using the 14 digit identification number of the ECM, determine the 7-digit PIN. Refer to Lost key procedure .

1. Press delta - button

Display on VAS 5051/5052

1. Select diagnostic function "06 - End Output" in selection -1-.

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "01 - Engine electronics".
2. Wait until the next indication appears on display.

Display on VAS 5051/5052

1 - Control module identification of Engine Control Module (ECM).

2 - Control module identification of immobilizer

Note. If a used Engine Control Module (ECM) is being installed, it must first be switched free via a login procedure. Refer to Login Procedure (function 11) . The 7-digit PIN must be determined via the 14-digit identification number of the used Engine Control Module (ECM). Continue as follows after successful login procedure

1. Press delta - button

Display on VAS 5051/5052

1. In selection -1-, select the diagnostic function "10 - Adaptation".

Display on VAS 5051/5052

1 - Enter channel number Max. input value = 99

1. Select function "50" in button field -2- for "Adaptation channel 50" and press Q button to confirm input.

Display on VAS 5051/5052

1 - Channel 50 read and test

2 - PIN ?

3 - Keypad - only direct input via the keypad is possible

4 - Sliding bar is positioned on 32000

1. Press "Keypad" button -3-.

Display on VAS 5051/5052

1 - Enter adaptation value Input value: 0 to 65535

1. Enter previously determined 7-digit PIN (of instrument cluster) in button field -2-.
2. Press -Q- button to confirm input.

Note. If the 7-digit PIN is entered incorrectly three times, tester display will indicate "locked 10". This locking time can also be indicated in measuring value block 024 (display field 1). Adaptation is now locked for 10 minutes. This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.

1. Wait until the next indication appears on display.

Note. If a malfunction occurs during adaptation, the following DTCs can be displayed: "Interference": CAN-bus not available or engine speed recognized (adaptation only with the engine standing still) "Adaptation not OK": Instrument cluster cannot give out data (17-digit VIN, 14-digit identification number), since the control module is still new (factory condition) or the data is faulty. "System not OK": Instrument cluster does not give out data, since it was previously used with a control module (Engine Control Module) with another performance class (tuning-protection) "Key not OK": Data cannot be given out or accepted, because no key or no matching key is available.

If no malfunction is present, this display appears

Display on VAS 5051/5052

1 - Channel 50 read and test

2 - 17-digit VIN (Vehicle Identification Number)

5 - Sliding bar is positioned on 32000

1. Press "Save" button -4-.

Display on VAS 5051/5052

1 - Channel 50 save

2 - 17-digit VIN (Vehicle Identification Number)

4 - original value 32000, new value 32000

1. Confirm new adaptation value by pressing the "take over" button -3-.

Display on VAS 5051/5052

1 - Channel 50 Value 32000 stored

1. End function "10 - Adaptation" by pressing <-- -button.

Adaptation of the Engine Control Module (ECM) to the immobilizer has been completed and the vehicle can be started.

Login Procedure (function 11)

In order to perform the Login procedure, a coded "secret number" must first be determined in conjunction with the 14 digit identification number of the Engine Control Module (ECM) or anti-theft immobilizer.

ECM and immobilizer identification numbers are read upon initiation of On Board Diagnostic (OBD).

Effective calendar date 03.11.2002, the immobilizer secret number is encoded for increased security. The encoded number is now 7-digits and is referred to as a "PIN" ("Personal Identification Number").

All models with anti-theft immobilizer are affected, regardless of generation.

The process to obtain the 7-digit PIN remains the same as with the 4-digit "secret number" previously used - that is: request via the "Warranty Information Network" (WIN). However, WIN Administration now requires additional information from both the vehicle and Dealer in order to generate the 7-digit PIN.

The PIN is only valid on the day it is requested. Thereafter, a new PIN is required.

The 7-digit PIN can only be processed and input using either the VAS 5051 or VAS 5052 with basis CD version 3.10 and higher. VAG 1551/1552 Scan Tools are unable to process or input this number.

A correct Importer/Dealer number must reside in the VAS 5051/5052 in order to request a PIN.

The requested PIN is intended for internal use only, is worthless to other Dealers and must not be shared with the customer.

Login Procedure, instrument cluster

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "17 - instrument cluster"
2. Wait until the next indication appears on display.

Display on VAS 5051/5052

1 - Control module identification of the instrument cluster

2 - Control module identification of immobilizer

1. Press delta - button

Display on VAS 5051/5052

1. In selection -1-, select the diagnostic function "11 - Login-procedure".

Display on VAS 5051/5052

1 - Enter code word Max. input value = 65535

1. Enter previously determined 7-digit PIN (of instrument cluster) in button field -2-.
2. Press -Q- button to confirm input.

Note. After the third incorrect input of the 7-digit PIN, the control module for anti-theft immobilizer or Engine Control Module (ECM) will be locked. It is not possible to make another attempt for 10 minutes. During this time, the ignition must remain constantly switched on. On Board Diagnostic (OBD) must be exited using the "End Output" function 06. This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.

Display on VAS 5051/5052

Note. Once the login procedure has been successfully completed, the warning lamp will light constantly and the immobilizer will be switched free: as long as the engine is running and the ignition key remains inserted, for 45 minutes, as long as the ignition key remains inserted (engine not running), for 5 minutes, if ignition key is removed.

Note. If indication -1- appears in display field: "Function unknown or cannot be performed at this moment", the 7-digit PIN was entered incorrectly (e.g. incorrect secret code)

Login Procedure, Engine Control Module (ECM)

Display on VAS 5051/5052

1. Press selection -1- of vehicle system "01 - Engine electronics".
2. Wait until the next indication appears on display.

Display on VAS 5051/5052

1 - Control module identification of Engine Control Module (ECM).

2 - Control module identification of immobilizer

1. Press delta - button

Display on VAS 5051/5052

1. In selection -1-, select the diagnostic function "11 - Login-procedure".

Display on VAS 5051/5052

1 - Enter code word Max. input value = 65535

1. Enter 7-digit PIN (of Engine Control Module (ECM)) in button field -2-.
2. Press -Q- button to confirm input.

Note. After the third incorrect input of the 7-digit PIN, the control module for anti-theft immobilizer or Engine Control Module (ECM) will be locked. It is not possible to make another attempt for 10 minutes. During this time, the ignition must remain constantly switched on. On Board Diagnostic (OBD) must be exited using the "End Output" function 06. This time is doubled after every third consecutive incorrect attempt, up to a maximum of 255 minutes.

Display on VAS 5051/5052

The Engine Control Module (ECM) is now switched free.

Note. If indication -1- appears in display field: "Function unknown or cannot be performed at this moment", the 7-digit PIN was entered incorrectly (e.g. incorrect secret code)

Note. Data is exchanged between individual control modules by means of a "bus" system. "CAN-Bus" is used to describe a system that transports and distributes data. The wires between the control modules that are used to transfer the data are known as signal wires. These signal wires are used for serial transmission of data, i.e. data is sent to each of the connected control modules in turn.

OBD program text/data generated by control modules installed on vehicles from m.y. 2001 may not be recognized by VAG 1551/1552 Scan Tools (ST) with the latest program card. For example: scan tool display shows "text 799", "01529 /references" or similar.

In addition, OBD programs for vehicle electrical equipment updates implemented from m.y. 2001 may also not supported by VAG 1551/1552 Scan Tools (ST) with the latest program card. For example: Powertrain CAN-Bus function - adaptation and addition of Automatic Transmission coding/adaptation etc.).

Only the VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System is capable of processing all display text/data, as well as performing coding, adaptation and related OBD program functions on these vehicles.

OBD program functions on vehicles from m.y. 2001 must be performed using the VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding".

All cruise control system functions are controlled by the Engine Control Module (ECM). The processing of electronic engine controls and cruise control functions are integrated in the ECM. Other than the cruise control switches on the steering column, the clutch and brake pedal switches and related wiring, there are no separate cruise control components to be serviced.

As all electronic throttle control operations are monitored by On Board Diagnostic (OBD), Diagnostic Trouble Codes (DTC) pertaining to engine electronics that are stored in DTC memory may be relevant to cruise control function.

Always check DTC memory first before troubleshooting CCS (function 02). Refer to

1. «01 ON BOARD DIAGNOSTIC (OBD)»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-amu) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
2. «01 ON BOARD DIAGNOSTIC (OBD)»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-atc) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
3. «01 ON BOARD DIAGNOSTIC (OBD)»(ref-276272-S12227258552008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
4. «01 ON BOARD DIAGNOSTIC (OBD)»(ref-276273-S13756956692008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA

The operating status of the cruise control system, cruise control switches, brake and clutch switches (as inputs to the ECM) can be tested using the following procedure.

Additional information

1. Wiring Diagrams
2. Technical Bulletins

1. Check fuses using wiring diagram
2. Connect VAG 1551/1552 Scan Tool, VAS 5051 Vehicle Diagnostic, Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. Ignition switched on

Note. If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram. Additional operating instructions can be called up with the scan tool HELP button. The --> button serves to advance the program sequence. If an incorrect entry is made, press button C to escape. In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

1. Switch on ignition.
2. Switch on printer with the Print button (indicator lamp lights up).
3. Press button -1- for "Rapid data transfer" mode.

Indicated on display

1. Press buttons -0- and -1- to enter "Engine electronics" address word 01.
2. Press --> button.

Indicated on display

"Read Measuring Value Block", performing

1. Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.

Indicated on display

1. Press -Q- button to confirm input

Indicated on display

1. With engine running at idle speed, press buttons -0-, -0- and -6- to enter display group number 066.
2. Press -Q- button to confirm input

The read measuring value block appears in the standard format.

Display group, summary

Interpreting displayed information. Refer to Cruise Control System (CCS), testing .

Read Measuring Value Block 066, interpreting

Indicated on display (example only)

Check displays in display zones 2 and 4.

Checking display in display zone 2

If display zone 2 does not read "1000" (CCS activated)

1. Check identification of engine control module.

Refer to

1. «01 ON BOARD DIAGNOSTIC (OBD)»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-amu) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
2. «01 ON BOARD DIAGNOSTIC (OBD)»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-atc) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
3. «01 ON BOARD DIAGNOSTIC (OBD)»(ref-276272-S12227258552008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
4. «01 ON BOARD DIAGNOSTIC (OBD)»(ref-276273-S13756956692008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA

1. If the letter "G" does not appear after component designation, cruise control must be activated to operate. Refer to «Cruise Control System (CCS), testing»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .

Checking display in display zone 4

Scheme 17

If the specifications for display zone 4 are not obtained when switch B is in the "ON/EIN" position (0011)

1. Connect test box VAG 1598/31 to wiring harness for engine control module. Refer to «Electrical testing using VAG1598/31 test box»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-amu__electrical-testing-using-vag159831-test-box) .

Cruise control system, activating/deactivating

1. Connect Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System VAS 5051 or VAG 1551 Scan Tool (ST). Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Press buttons -0- and -1- to enter "Engine electronics" address word 01.

Indicated on display

1. Press the "1" button twice to select "Log-in Procedure" function 11
2. Press -Q- button to confirm input.

Indicated on display

Activating

1. Enter code number 11463
2. Press -Q- button to confirm input.

Deactivating

1. Enter code number 16167
2. Press -Q- button to confirm input.

Wiring and component check using test box VAG 1598/31

Note. Test box VAG 1598/31 is designed so that it can be connected to the wiring harness for the engine control module and to the engine control module itself at the same time. This has the advantage of enabling the engine management system to remain fully operational even with the test box connected (for example, when testing signals while the engine is running). The instructions for performing the individual tests indicate whether or not the engine control module itself also needs to be connected to the test box. Use the hand multimeter VAG 1526 or the multimeter VAG 1715 and the diode test lamp VAG 1527 for the checks. To connect the testers to test box 1598/31, always use the adapter leads from adapter set VAG 1594. After re-connecting the engine control module, perform adaptation of engine control module to throttle valve control module.

Refer to

1. «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-amu) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU
2. «28 IGNITION/GLOW PLUG SYSTEM»(/audi/tt/8n-1998-2003/remont/fuel-system/#18l-4-cyl-5v-turbo-fuel-injection-ignition-engine-codes-atc) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC
3. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276272-S33271097972008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP
4. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276273-S13509179772008010300000) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA
5. «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/tt/8n-1998-2003/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-generic-scan-tool-engine-codes-amu-bea-atc-awp) for 1.8 LITER 4-CYL. 5V TURBO GENERIC SCAN TOOL ENGINE CODE(S): AMU, BEA, ATC, AWP
6. «24 MULTIPORT FUEL INJECTION (MFI)»(ref-276275-S13244009452008010300000) for 3.2 LITER V6 4V FUEL INJECTION & IGNITION, ENGINE CODE(S): BHE
7. «24 - MULTIPORT FUEL INJECTION (MFI)»(ref-276276-S26267386092008010300000) for 3.2 LITER V6 4V GENERIC SCAN TOOL, ENGINE CODE: BHE

1. Switch off ignition.
2. Remove cover of protective housing for control modules.

Scheme 18

1. Carefully lever off the retainer bar with a screwdriver -arrow-.
2. Then release connectors on control module and pull off.

Scheme 19

1. Connect test box VAG 1598/31 to wiring harness connector. Also connect the Ground clamp on the test box (not shown in the illustration) to the battery negative terminal. The instructions for performing the individual tests indicate whether or not the engine control module itself also needs to be connected to the test box.
2. Carry out test as described in the repair instructions.
3. Disconnect harness connector at cruise control switch. Refer to «Steering column switches, removing and installing»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment__steering-column-switches-removing-and-installing) .

Wire connection should be checked for short circuit to B+, short circuit to Ground and open circuit.

1. Check wire connection according to wiring diagram.

Refer to Wiring Diagrams

1. Repair open circuit or short circuit if necessary.

If wire connection is OK, cruise control switch must be replaced.

Automatic headlight adjustment is required on vehicles with High Intensity Gas Discharge (HID) headlights.

Automatic vertical headlight aim control system keeps the low beams at a constant level even if the car is loaded, a situation which would normally change the headlight angle.

There are two vehicle level sensors, one on the front axle and one on the rear axle. These sensors register the vehicle's fore/aft angle of inclination. The Vehicle Speed Signal (VSS) is also processed.

The control module evaluates these signals and activates the headlight beam adjusting motors when low beams are on.

Function

The automatic vertical headlight aim control system consists of

1. Automatic vertical headlight aim control system control module -J431
2. Left rear level control system sensor -G76
3. Left front level control system sensor -G78
4. Right headlight beam adjusting motor -V48

1. Left headlight beam adjusting motor -V49

When starting the engine, vehicle level is measured and compared to the set point. This signal is sent to the headlight beam adjusting motors which adjust headlight position to this value once, whether or not the low beams are on.

After this single correction, signals to change low beam position will only be sent to the headlight beam adjusting motors with the low beams on.

If a trip is interrupted (vehicle speed less than 1 km/h) and a vehicle position change is recognized due to additional weight (e.g. extra people in the car) the headlights will be automatically adjusted to the proper height.

All changes made by the automatic vertical headlight aim control system are due to static operating conditions.

Note. The following description is only relevant for the VAG1551 scan tool.

Automatic vertical headlight aim control On Board Diagnostic (OBD), initiating

Additional information

1. Wiring Diagrams
2. Technical Bulletins

Scan Tool (ST) and test equipment safety precautions

Test requirements

1. Check fuses using wiring diagram
2. Connect VAG 1551/1552 Scan Tool, VAS 5051 Vehicle Diagnostic, Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System. Refer to «VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)
3. Ignition switched on

Note. If the display remains blank, check voltage supply of VAG 1551 according to wiring diagram. Additional operating instructions can be called up with the scan tool HELP button. The --> button serves to advance the program sequence. If an incorrect entry is made, press button C to escape. In the operating mode 1 "Rapid data transfer" the function 00 can be used to perform an "Automatic test sequence." This will check all control modules in the vehicle automatically.

1. Switch on printer with the Print button (indicator lamp lights up).
2. Press button -1- for "Rapid data transfer" mode.

Indicated on display

Automatic vertical headlight aim control address word: 55

1. Press buttons -5- and -5- to enter "Head lamp vertical aim control system" address word 55.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display (example only): (after about 5 seconds)

1. Automatic vertical headlight aim control system control module identification: 4B0907357
2. Software version: D003
3. Control module coding: 00009
4. WSC 06812: dealer number

1. Press --> button.
2. If one of these four messages is displayed, carry out troubleshooting procedures. Refer to Wiring Diagrams, Troubleshooting & Component Locations binder.

Indicated on display

1. Press HELP button to print list of possible functions.
2. Press --> button to continue.

On Board Diagnostic (OBD) functions

The following functions are possible

01 - Check control module version

02 - Check DTC Memory. Refer to Diagnostic Trouble Code (DTC) Memory, checking (function 02)

03 - Output Diagnostic Test Mode. Refer to Output Diagnostic Test Mode (DTM) (function 03)

04 - Basic Setting. Refer to Basic Setting (function 04)

05 - Erase DTC Memory. Refer to Diagnostic Trouble Code (DTC) Memory, erasing (function 05)

06 - End Output. Refer to End Output (function 06)

07 - Code Control Module. Refer to Code Control Module (function 07)

08 - Read Measuring Value Block. Refer to Read Measuring Value Block (function 08)

Control Module Versions, checking (function 01)

Indicated on display

1. Press buttons -0- and -1- to select "check control module versions" function 01.

Indicated on display

1. Press -Q- button to confirm input.

Indicated on display (example only): (after about 5 seconds)

1. Automatic vertical headlight aim control system control module identification: 4B0907357
2. Software version: D003
3. Control module coding: 00009
4. WSC 06812: Dealer number

1. Press --> button.

Note. The DTCs indicated are only updated when initiating On Board Diagnostic (OBD)or with "Erase DTC Memory" function 05.

1. Switch printer on by pressing PRINT button (indicator light in button comes on).

Indicated on display

1. Press buttons -0- and -2- to select "Check DTC Memory" function 05.

Indicated on display

1. Press -Q- button to confirm input.

The number of stored Diagnostic Trouble Codes (DTCs) is shown on the display.

Stored DTCs are displayed in sequence and printed out one after another.

1. Repair malfunctions printed out according to DTC Table. Refer to «Diagnostic Trouble Code (DTC) table»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment)

If "No DTC recognized" is shown on display

1. Press --> button to return VAG1551 scan tool to "Select function XX" mode.

Indicated on display

If anything else is indicated on display. Refer to VAG1551 Scan Tool (ST) operating instructions.

1. Press buttons -0- and -6- to select "End Output" function 06. Refer to «End Output (function 06)»(/audi/tt/8n-1998-2003/remont/cruise-control-systems/#electrical-equipment) .
2. Switch ignition off.
3. Disconnect VAG1551 scan tool from DLC.

Note. All possible malfunctions recognized by the automatic vertical headlight aim control system and printed out by the VAG1551 Scan Tool (ST) are listed on the following sections according to the 5-digit DTC. The 5-digit DTC numbers are only shown on the printout. Before replacing a component suspected of malfunctioning, check all related wiring connections, harness connections and Ground (GND) connections according to the appropriate wiring diagram. Refer to "Wiring Diagrams, Troubleshooting & Component Locations" binder. After completing necessary repairs, connect the VAG1551 scan tool, check DTC memory (scan tool function 02) and, if necessary, erase DTC memory (scan tool function 05). DTC memory contains all static and sporadic faults. A malfunction is recognized as static if it exists for at least 2 seconds. If a static malfunction is no longer present after 2 seconds it will be classified as a sporadic malfunction and identified by the letters "/SP" in the lower right of the VAG1551 scan tool display. When the ignition is switched on, all malfunctions present are identified as "sporadic" and are only stored as static malfunctions if they are detected in the next check routine. A sporadic malfunction will be erased if it no longer exists after 50 driving cycles (ignition on for at least 5 minutes, road speed above 30 km/h or 18 mph).

Note. The output Diagnostic Test Mode (DTM) can only be carried out on a stationary vehicle. Switch ignition on. Switch low beam on. If a malfunction is found during the output DTM, trace the cause and replace the malfunctioning part.

The following tests can be carried out by output DTM

1. Lowering headlights
2. Raising headlights

Output DTM, initiating

1. Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03.