Technician Safety Information

Motronic injection system, servicing

Safety precautions

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

WARNING:
- Always install testers and measuring instruments on the back seat and have a second person operate them from there.
- 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 stages of the ignition coils and also the connectors on the injectors.
- In the case of some tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, the Diagnostic Trouble Code (DTC) memory should be checked 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 module may be damaged.

WARNING: The fuel system is pressurized! Before loosening hose connections or opening the test connection (to measure fuel pressure), place a cloth around the connection. Then release pressure by carefully loosening the connection.