Safety Precautions

Safety Precautions

Note the following when working on the fuel system:

There is a risk of injury because the fuel is under very high pressure.

• Reduce the fuel pressure down to residual pressure before opening high pressure area of the fuel injection system.

• To reduce remaining residual pressure, place clean cloth around the connector and carefully loosen connector.

- Procedures before opening high pressure fuel injection system. Refer to => [ Before Opening High Pressure Fuel Injection System ] Before Opening High Pressure Fuel Injection System.

Burn risk due to escaping fuel.

• Because the transfer fuel pump (G6) runs briefly when the battery is connected and the driver door is opened, the voltage supply to the fuel pump control module (J538) must be disconnected before opening the fuel system.

- Remove the right luggage compartment side trim.

- Remove the fuse 6 (on fuse panel F) (SF6) for the fuel pump control module in the fuse holder in the right of the luggage compartment.






To prevent personal injury and damage to the injection and ignition system, observe the following:

• Turn off the ignition before disconnecting and connecting the wiring for the injection and ignition system. This includes tester cables as well.

• Only clean engine with ignition switched off.

• If electrical connectors were disconnected, faults are saved in ECM:

- Connect the vehicle diagnosis, testing and information system (VAS 5051B).

- Start "Guided Functions" operating mode.

- Generate readiness code in Engine Control Module (ECM).

Danger of causing damage to electrical components when disconnecting the battery.

• Complete the steps for disconnecting the battery.

• Turn off the ignition and disconnect the battery.

- Disconnect the battery.

Note the following when working on the cooling system:

Risk of scalding due to hot steam and hot coolant.

• The coolant system is under pressure when the engine is warm.

• Reduce pressure by covering coolant reservoir cap with a cloth and carefully open.

If it is necessary to use testing and measuring devices on road tests, observe the following:






Distraction and improperly secured test equipment can lead to accidents.

Risk of passenger airbag deploying in an accident.

• Operating testing and measuring equipment while driving creates a distraction.

• There is an increased risk of injury due to unsecured testing and measuring equipment.

TT Coupe:

Always secure testers on the rear seat with a strap and have a second person on the rear seat operate them.

TT Roadster:

• Position passenger's seat as far back as possible.

• Only use the vehicle diagnosis and service system (VAS 5052) or diagnostic system (VAS 5053).

• Testing and measuring instruments - 1 - must lay flat on the passenger's thighs and be operated by him or her, as shown in the illustration.