Safety Precautions

Motronic Injection System, Servicing

Safety precautions

WARNING:
- To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:
- Only disconnect and reconnect wires for injection and ignition system, including test leads, when ignition is turned off.
- If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect connector from ignition coils and from fuel injectors.
- Always attach testers and measuring instruments to the back seat and have a second person operate them from there.
- It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary.
- Always switch ignition off before cleaning engine.
- The battery should only be disconnected and reconnected when the ignition is turned off, since otherwise the Engine Control Module (ECM) can be damaged.

If special testing equipment is required during test drive/road test, observe the following:

WARNING:
- If test equipment is 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.
- Use only the VAS 5051 scan tool to read measured value blocks. Always secure the tester to the rear seat and operate it from there by a second technician.

- The fuel system is pressurized. Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.