Audi Workshop Service and Repair Manuals

Note the following points if testers and measuring instruments have to be used during a road test:

• ◆ Testers and measuring instruments must always be secured to the rear seat and operated by a 2nd person from this location.

• If test equipment were operated from the front passenger seat, the person sitting there could be injured if the front passenger airbag were triggered in the event of an accident.

To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted:

• ◆ Always switch off the ignition before connecting or disconnecting injection or ignition system wiring or tester cables.

• ◆ To run engine at starting speed without actually starting it (for example, in order to test compression), unplug connector from the output stage of the ignition coils and also the connectors on the injectors.
• ◆ During certain tests it is possible that faults are detected and stored by the control unit. At the end of all tests and repairs, therefore, the fault memory should be interrogated and, if necessary, erased.
• ◆ Always switch off the ignition before washing the engine.
• ◆ Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control unit may be damaged.