Maintenance Procedures: Diagnosis Audi TT 8N facelift

Checking DTC memory

1. Start engine and allow to run at idling speed.
2. Enter "00" to select the address word "Automatic test sequence" and confirm entry with -Q- button. The VAG 1551 will transmit all the known address words one after the other.

When a control unit answers with its identification the number of stored DTCs appears on the display or "No DTC recognized."

Any system malfunctions that are stored will be displayed one after the other and printed out. The VAG 1551 will then transmit the next address word.

When the following display appears the automatic test sequence is completed

1) appears alternately

1. Switch ignition off.

If DTCs have been stored they must be rectified. The DTC print-out will be needed to enable the work to be carried out.

Note. Leave VAG 1551 scan tool connected for resetting the service interval display and for the exhaust emissions test (if required).

Delivery Inspection

There are two possible methods of resetting the "SERVICE" display

1. Using the adjustment buttons for the trip recorder and clock on the dash panel insert

1. Reset "SERVICE IN XXXX km" or "SERVICE". Refer to «Resetting service interval display with adjustment buttons for trip recorder and clock»(ref-276296-S12401482572008022600000) .

or

1. Using VAG 1551 scan tool

1. Select Adaptation channel 02 and enter the Adaptation value "00000". Refer to «Resetting service interval display with VAG 1551»(ref-276296-S12509397642008022600000) .

Oil change or inspection

The service reminder will first appear 2000 km before the next service is due. The display message comes up for 5 seconds in the central display.

Display message: "SERVICE IN XXXX km"

When service becomes due, the display will show: "SERVICE"

1. Connect VAG 1551. Refer to «Connecting VAG 1551»(ref-276296-S29421601472008022600000) .
2. Switch ignition on.

Indicated in display

1) appears alternately

1. Enter -1- to select "Rapid data transfer."

Indicated on display

1. Enter -1- and -7- to select the address word "Dash panel insert" and confirm entry with -Q- button.

Indicated on display (example)

Road test

To what extent the following can be checked is dependent upon the vehicle equipment and local conditions (urban/country).

The following points must be checked during the road test

1. Engine: performance, misfiring, idling, acceleration
2. Clutch: pulling away, pedal pressure, odors
3. Gear selection: ease of operation, gear lever position
4. Brake pedal and parking brake: operation, travel and effectiveness, puling to one side, shuddering, squeal, operation of ABS

1. Steering: operation, steering free play, steering wheel centered when wheels are in the straight ahead position
2. Cruise control system operation
3. Radio: quality of reception, SVC (Speed Compensated Volume), interference
4. Driver Information System (DIS): functions

1. Air conditioner: operation
2. Vehicle: moving off line when travelling straight ahead (level road)
3. Imbalance: wheels, drive shafts
4. Wheel bearings: noises

1. Engine: hot starting behavior

RAPGARD ® , inspection, removal and disposal

From my 2002

Service

Within 48 Hours after arrival at Dealer

Inspection

1. Inspect RAPGARD ® for damage or peeling.

If RAPGARD ® is disturbed (dented, scratched, etc.)

1. You must note the damage on the Carrier Delivery Receipt, including damage type, extent and location. Failure to note damage on the Carrier Delivery Receipt will result in non-payment of the repair.

Note. RAPGARD ® must be removed from the vehicle no later than six months after application. See sticker (location on vehicle body varies) for detailed information.

Within 72 Hours prior to delivery to the Customer

1. Remove RAPGARD ® from vehicle.
2. Wash vehicle exterior.
3. Inspect paint surfaces, moldings and glass.
4. Protect the paint surface of all new vehicles by applying 3M Perfect-It ™ Paste Wax (3M Part No. 39526) or equivalent.

Removal

1. Vehicle must be at room temperature.
2. The ideal body surface temperature for RAPGARD ® removal is 60 ° F (15.5 ° C) to 80 ° F (26.6 ° C).

If body surface temperatures are below 60 ° F (15.5 ° C) or above 80 ° F (26.6 ° C) then

1. Removal procedure should be performed indoors after surface temperatures have been allowed to stabilize within the given range.

1. Rinse vehicle thoroughly with water to remove surface dirt or dust and to help stabilize body surface temperatures.
2. Starting at the corners of each panel, carefully remove RAPGARD ® from vehicle.

RAPGARD ® , paint inspection after removal

1. Inspect painted surfaces under one of the following lighting conditions

1. Indoors under fluorescent lighting.
2. Outdoors under bright sunlight.

Important!

If any defects on the exterior have been identified (scratches, dings, dents and other types of body damage)

1. Contact your Service Manager and arrange to repair defects immediately.

Note. After removal of RAPGARD ® , some vehicles may exhibit temporary paint discoloration or paint swelling (caused by trapped moisture under the RAPGARD ® ). This temporary swelling is caused by the paint finish absorbing moisture trapped under the RAPGARD ® film. This swelling will disappear with exposure to the sun or heat lamps within 2 - 3 hours. Severe Paint swelling may require 2 - 3 days to recover.

DO NOT buff or refinish paint for this condition!

Adhesive residue removal

If RAPGARD ® adhesive residue remains on paint finish, remove with a non-abrasive polishing product such as, (3M Part No. 5995) light colors or (3M Part No. 5996) dark colors.

Thick lines of adhesive residue can be removed with general purpose adhesive cleaner (3M Part No. 08987-aerosol, or Part No, 08984-qt. can) or equivalent.

Note. Paint discoloration (looks like shaded or dark magic marker lines) can be removed with a heat gun using the following procedure

1. Hold heat gun approximately 3 in. away from affected paint surfaces and apply heat using slow oscillating motions until discoloration is gone.
2. If discoloration remains, wipe the heated area with Isopropyl alcohol and repeat procedure to increase surface drying.

Important!

After inspecting and removing RAPGARD ® , washing vehicle, inspecting and repairing any defects in paint surfaces, moldings and glass

1. Protect the vehicle paint surface by applying 3M Perfect-It ™ Paste Wax (3M Part No. 39526) or equivalent.

RAPGARD ® Disposal

RAPGARD ® can be disposed as normal paper waste. If unsure about proper disposal procedures in your area, check local regulations.

New Protective Vehicle Transit Coating, Liquid Film, inspection, removal and disposal

From my 7.2001

Condition

Scheme 7

A new "liquid film" polyurethane (PE) protective vehicle transit coating will be used on some TT models beginning with 7/2001 production.

Service

At the latest 72 hours prior to delivery

1. Inspect liquid film.
2. Remove liquid film from vehicle.
3. Wash vehicle exterior.
4. Inspect paint surfaces, moldings and glass.
5. Protect the paint surface of all new vehicles by hand-applying 3M Perfect-It ™ Paste Wax (3M Part No. 39526) or equivalent.

Note. Liquid film must be removed from the vehicle no later than six months after application. See sticker (location on vehicle body varies) for detailed information. Vehicles stored outside for longer than six months must be protected with a conventional wax (3M Perfect-It ™ Paste Wax or equivalent). To avoid swirl marks and/or scratches, always apply and remove wax by hand. Do not use a high-speed buffer!

Liquid film inspection

1. Inspect film for damage or peeling.

If film is disturbed (dented, scratched, etc.)

1. Note any damage on the Carrier Delivery Receipt, including damage type, extent, and location. Failure to note damage on the Carrier Delivery Receipt will result in non-payment of the repair.

Liquid film removal

1. Body surface temperature must be within 14 ° to 122 ° F(-10 ° to 50 ° C) range.
2. To avoid damage to the paint, surface temperature of paint should not exceed 176 ° F (80 ° C).

1. If necessary, rinse vehicle with cool water to lower body surface temperature.
2. Starting at the corners of each panel, remove liquid film in one steady motion.

Paint inspection after film removal

1. Inspect painted surfaces under one of the following lighting conditions

1. Indoors under fluorescent lighting.
2. Outdoors under bright sunlight.

Temporary paint discoloration or swelling, caused by residual water in the film material diffusing into the paint, may become visible after film removal.

Depending upon ambient temperature, the discoloration or swelling will disappear after approximately 24 hours regeneration time.

Severe paint discoloration or swelling can be removed with a heat gun or hair dryer as follows

1. Hold heat gun approximately 3 in. away from affected paint surfaces and apply heat using slow oscillating motions until discoloration is gone.

Removal of liquid film residue or overspray

Thick lines of adhesive residue can be removed with general purpose adhesive cleaner (3M Part No. 08987-aerosol or 3M Part No. 08984-qt. can) or equivalent.

Adhesive residues remaining on the paint after removal of the film can be easily removed after approximately 12 hours. Use a non-abrasive polishing product (3M Part No. 5995 for light colors or 3M Part No. 5996 for dark colors).

Film overspray (i.e. film sprayed into gaps) can be removed with an isopropyl alcohol cleaning solvent, VW Part No. D 009 401 04.

Disposal of liquid film

Liquid film can be discarded as normal paper waste. If uncertain about proper disposal procedures, check local regulations.

Exhaust emission test

Note. Emissions test specifications. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMU 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): ATC 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AWP 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): BEA . The following exhaust emissions test applies only to countries in which no emissions test is required to be conducted in compliance with national regulations. Malfunctions stored in the DTC memory must be repaired and DTC memory must be erased before the emissions test is carried out.

Required test equipment

1. VAG 1767 ignition tester (or VAG 1367)
2. MGA 1400 digital 4-gas exhaust analyzer or equivalent
3. VAG 1551 Scan Tool (ST)

Visual inspection

1. Inspect emissions components to make sure they are

1. Installed
2. Complete
3. Free of leaks
4. Free of damage

Connecting VAG 1551

1. Apply parking brake.

1. With the ignition switched off, connect V.A.G. 1551 with V.A.G. 1551/3 adapter cable.

Connecting MGA 1400 digital 4-gas exhaust analyzer

1. Connect exhaust tester as stated in operating instructions.
2. Insert test probe in exhaust tailpipe.

Test procedure

Note. The A/C system must be switched off during test. The Oxygen Sensor (O2S) control is working properly if no DTCs are stored in DTC memory. After the exhaust emissions test is completed, any hoses or connectors which were disconnected for the test must be connected. After the exhaust emissions test is completed, equipment such as power steering, air conditioning, and the automatic transmission should be operated in order to check whether the engine runs smoothly when subjected so the additional loading from these systems. The ignition timing point is determined by the ECM and cannot be displayed or adjusted. Idle speed and CO content cannot be adjusted. If test results differ from the test specifications the appropriate repairs must be carried out.

1. Continue running engine at idle after DTC memory has been checked and erased.

Indicated on display

1. Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
2. Press -Q- button to confirm input.

Indicated on display

1. Press buttons -0-, -0- and -1- to input display group 001.
2. Press -Q- button to confirm input.

Indicated on display

1. Read idle speed indicated in display field 1.
2. Read CO content indicated on exhaust tester.
3. Press --> button.

Indicated on display

1. Press buttons -0- and -6- to select "End Output" function 06.
2. Press -Q- button to confirm input.